Penstemon grandiflorus

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Penstemon grandiflorus
Penstemon grandiflorus - Evan Grimes 01.jpg
Status TNC G5.svg
Secure  (NatureServe) [1]
Scientific classification OOjs UI icon edit-ltr.svg
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Lamiales
Family: Plantaginaceae
Genus: Penstemon
Species:
P. grandiflorus
Binomial name
Penstemon grandiflorus
Synonyms
  • Chelone bradburyi (Pursh) Steud.
  • Chelone grandiflora Spreng.
  • Penstemon bradburyi Pursh

Penstemon grandiflorus, known by the common names shell-leaved penstemon, shell-leaf beardtongue, or large-flowered penstemon, is a tall and showy plant in the Penstemon genus from the plains of North America. Due to its large flowers it has found a place in gardens, particularly ones aimed at low water usage like xeriscape gardens.

Contents

Description

Penstemon grandiflorus basal leaves Penstemon grandiflorus - Mathew Zappa 01.jpg
Penstemon grandiflorus basal leaves

Penstemon grandiflorus is a large herbaceous plant with flowering stems that can reach as much as 120 centimeters in height or be as short as 40 centimeters. More commonly the plants will be 50–90 centimeters in height at full size. [2] The whole of the stem and leaves are smooth and free of hairs (glabrous). The leaves springing directly from the base of the plant (basal) or on the lower part of the flowering stem are very large for a penstemon, 30–160 millimeters long and 6–50 millimeters wide. These lower leaves have a range of shapes from similar to a spoon (spatulate) to more of an egg shape (obovate). The base of the lower leaves tapers and the end has a rounded point that can be either narrow or broad. [2] Moving up the flowering stem there will be four to eight pairs of leaves that attach without a short leaf stem (sessile) with bases that wrap part way around the stem, an appearance usually called clasping. They have the same shape range as the lower leaves from like a spoon to like an egg, but are smaller with a maximum length of 110 millimeters and a more common average of 18–90 millimeters. [2]

Flowering

Penstemon grandiflorus flowers Penstemon grandiflorus - Tom Scavo 01.jpg
Penstemon grandiflorus flowers

Penstemon grandiflorus has flowering stems are round in cross section and the portion with flowers (the thyrse) is 12–40 centimeters long, though usually shorter than 30 centimeters. The flowering stem has small branchlets off the main stem (interrupted thyrse) in three to nine paired groups on each side of the stem, though there are usually less than seven pairs. Each group (cyme) will have two to four flowers, for four to eight per pair. There are pairs of much smaller leaves (bracts) under where each flower group attaches to the stem. They have a similar shape to the main leaves, egg shaped, widest at the mid base, (elliptic) or circular (orbiculate) and most often 16–83 millimeters long and 16–54 millimeters wide. Though occasionally the bracts will be as little as 9 millimeters long and wide. [2]

The sepals (calyx) of Penstemon grandiflorus are merged around the base of the flower with lobes that are egg shaped (ovate) or shaped like the head of a spear (lanceolate), 7–11 millimeters long and 2.5–4 millimeters wide. The edges of the sepals are smooth, without teeth, but may rarely look like they have been worn away or nibbled (erose). The sepals are green and soft in texture or dried out with a smooth, hairless surface (glabrous). P. grandiflorus has petals (the corolla) that merge to form an inflated tube that measures 35–48 millimeters from base to opening. The petals are blue to pinkish blue with magenta nectar guides. The flower is hairless both externally and internally. The tube portion is 10–13 millimeters long and 15–18 millimeters in diameter. The stamens are contained within the tube of the flower. The fuzzy staminode or beardtounge is 16–21 millimeters long and may either reach beyond the opening of the flower or be contained within it. The tip of the staminode curves backwards and is covered in golden yellow hairs that are up to half a millimeter long. The female pistil (style) is 19–30 millimeters long. [2]

In its native habitat flowering lasts for a few weeks within the period of April through July. [2] [3] The fruit is a capsule that is most often 16–20 millimeters long, but may occasionally reach 25 millimeters, and is 8–15 millimeters in width with a teardrop shape. [2] The brown seeds are large and shaped like rough cubes. [4]

Taxonomy

While there is no dispute as to recognizing Penstemon grandiflorus as a species, there has been division between botanists over the correct name of the species for over a century. The dispute is over if Thomas Nuttall or Frederick Traugott Pursh should be credited for publishing the first description of the species and being able to name it under the principle of priority. Pursh wrote a two volume book about the plants of North America titled Flora Americae Septentrionalis with the first description of many plants. Nuttall is credited with writing the Catalogue of New and Interesting Plants Collected in Upper Louisiana, both have at times been listed as being published in 1813. However, the second volume of Pursh's book, where the description of the species is located, was almost undoubtedly published in 1814. [5] [6]

Botanists who credit the German-American botanist Pursh use the name Penstemon bradburyi. They list Nuttall's first publication as 1818 in the book The Genera of North American Plants: And a Catalogue of the Species, to the Year 1817 with the view that his earlier book did not have a valid description of the species. [7] [8]

The American botanist Francis W. Pennell was one of the most prominent of the advocates for crediting Nuttall and using the name Penstemon grandiflorus. In a 1926 paper he quotes the short description from the catalogue to establish priority for the name. [9] Though the spelling used in the original publication is Penstemon grandiflorum. [10] [11] In a 1956 paper in Rhodora , Arthur Cronquist and his coauthors made the argument that P. grandiflorus had been in use since 1829 and that in the interests of stability it should be retained. [8]

As of 2023 Penstemon bradburyi is listed as the correct name by Plants of the World Online (POWO) and World Plants. [7] [12] POWO lists Penstemon grandiflorus as a superfluous name. [7] World Flora Online (WFO) has a confusing position listing both names as accepted in 2023. [13] [14] Disagreeing with these databases the Missouri Botanical Garden, [15] the USDA Natural Resources Conservation Service PLANTS database (PLANTS), [16] the Flora of North America (FNA), [2] and NatureServe [1] all list the species as Penstemon grandiflorus.

Names

The common names of Penstemon grandiflorus include the usual division between using "penstemon" as a common name and "beardtongue" as a common name for the genus. For example "shell-leaf beardtongue" in FNA and "shell-leaved penstemon" in the Growing Penstemons bulletin from Colorado State Extension. [2] [17] Other names used for the species include "large-flowered penstemon", [18] "large penstemon", [16] "large flower beardtounge", and "wild foxglove". [3]

The Lakota name for this plant is kimi'milia tawana'hca, which translates as butterfly flower. [19]

Range and habitat

The exact natural range of Penstemon grandiflorus is somewhat uncertain. It is generally agreed that it grows from Texas to Montana and then east to Minnesota, Wisconsin, and Illinois. Outside this triangle on the Great Plains of North America it is uncertain how far the native range extends. [7] [2] [1] [12] [16] All sources but NatureServe list it has growing in New Mexico. [1] Both POWO and NatureServe list it as an introduced species in Indiana, while the other sources either do not list it or do not make that distinction. [1] [7] Only POWO lists it as an introduced species in Massachusetts, Connecticut, Ohio, and Michigan, though most other sources list it as present in those states. [7] [16]

The preferred natural habitat for Penstemon grandiflorus is in sandy soils or lime to chalky soils (calcareous). [2] They are a plant of tallgrass, mixed-grass, sand prairies, and oak savannas, open sandy woods, and sandy roadsides. [2] [20] [4]

Penstemon grandiflorus was last evaluated by NatureServe in 1993. At that time it was evaluated with a conservation status of secure, G5 as they thought the global population was not significantly declining. There are, however, threats to the species at the local level. They have found it is vulnerable (S3) in Iowa, imperiled (S2) in Wyoming, and critically imperiled (S1) in Montana, Colorado, Oklahoma, Missouri, and Illinois. [1] The range for the species is very limited in Colorado, only being found in a few counties on its eastern border. [4] It is found in a limited number of northern counties in Illinois and has been designated an endangered plant by the state. [21] [22]

Ecology

In areas with plains pocket gophers (Geomys bursarius) the numbers of Penstemon grandiflorus are reduced because they readily eat the plants. Penstemon grandiflorus is somewhat fire adapted. Older plants show very little reduction after controlled burns and only some of the younger plants are negatively impacted. In oak savannas fire is also an important force in maintaining suitable openings for plants like P. grandiflorus. [20] Flower visitor include bumblebees and hummingbirds. [4]

Uses

Cultivation

Because it is the, "Largest and showiest of the North American prairie penstemons," [4] the shell-leaf penstemon is often grown in dry landscaping and xeriscape gardens. [23] Adult plants are resistant to damage by slugs and also not preferred as forage by deer. [24] [4] [25] They require a well drained soil such as gravel, sand, sandy loam, or dry loam. [25] [4]

A variety of shell-leaf penstemon with a wider range of flower colors from white to deep purple was developed by Denver resident Mary Anne Heacock. Under the name "Prairie Jewell" it is promoted by the Colorado horticultural non-profit Plant Select. [25]

In a garden setting the plants typically have a three to five year lifespan. New plants will volunteer from seed, but not aggressively. Seeds require 30 days of cold-moist stratification for good germination rates. Shell-leaf penstemon is hardy in USDA zones 3–7. [4]

Traditional uses

The Dakota people are recorded by the ethnographer Dilwyn J. Rogers as using the boiled root for chest pain. [19]

Related Research Articles

<i>Penstemon</i> Genus of plants

Penstemon, the beardtongues, is a large genus of roughly 280 species of flowering plants native to North America from northern Canada to Central America. It is the largest genus of flowering plants endemic to North America. As well as being the scientific name, penstemon is also widely used as a common name for all Penstemon species alongside beardtongues.

<i>Geum triflorum</i> Species of flowering plant

Geum triflorum, commonly known as prairie smoke, old man's whiskers, or three-flowered avens, is a spring-blooming perennial herbaceous plant of the Rosaceae family. It is a hemiboreal continental climate species that is widespread in colder and drier environments of western North America, although it does occur in isolated populations as far east as New York and Ontario. It is particularly known for the long feathery plumes on the seed heads that have inspired many of the regional common names and aid in wind dispersal of its seeds.

<i>Penstemon digitalis</i> Eastern North American species of penstemon

Penstemon digitalis is a species of flowering plant in the plantain family, Plantaginaceae. The flowers are white and are borne in summer. It is native to eastern Canada and the eastern and southeastern United States. Penstemon digitalis is the most widespread species of Penstemon east of the Mississippi River.

<i>Aconitum columbianum</i> Species of plant

Aconitum columbianum is a species of flowering plant in the buttercup family known by the common names Columbian monkshood or western monkshood.

<i>Penstemon heterophyllus</i> Species of flowering plant

Penstemon heterophyllus is a species of penstemon known by the common names bunchleaf penstemon, foothill penstemon, and foothill beardtongue. It is endemic to California.

<i>Penstemon barrettiae</i> Species of flowering plant

Penstemon barrettiae is a species of flowering plant in the plantain family known by the common name Barrett's beardtongue or Barrett's penstemon. It is endemic to a small part of the Pacific Northwest of North America.

<i>Tetraneuris acaulis</i> Species of flowering plant in the sunflower family

Tetraneuris acaulis is a North American species of flowering plants in the sunflower family. It is known by many common names in English including stemless four-nerve daisy, stemless hymenoxys, butte marigold, and stemless rubberweed.

<i>Castilleja integra</i> Species of flowering plant

Castilleja integra, with the common names orange paintbrush, Southwestern paintbrush, and wholeleaf paintbrush, is a partially parasitic herbaceous perennial plant native to the Southwestern United States and Northern Mexico. The species produces a relatively large amount of nectar and is attractive to hummingbirds. It is better suited to cultivation than most other species in the paintbrush genus (Castilleja) and is therefor used in xeriscape gardens and naturalistic meadows, even outside its native range.

<i>Oenothera harringtonii</i> Species of flowering plant

Oenothera harringtonii is a species of flowering plant in the evening primrose family known by the common names Arkansas Valley evening primrose and Colorado Springs evening primrose. It is endemic to the state of Colorado in the United States.

<i>Pediomelum tenuiflorum</i> Plant species in the pea family

Pediomelum tenuiflorum, the slimflower scurfpea, is a perennial in the pea family. It is about 2–3 feet (0.6–0.9 m) tall and has a lot of leaves on top. Its leaves can reach a length of 3 inches (80 mm). This flower can be found mainly in the central and southwestern U.S.

<i>Mertensia lanceolata</i> Species of plant in the borage family

Mertensia lanceolata, known as prairie bluebells, lance-leaved bluebells, lance-leaved lungwort, and narrow-leaved languid ladies is a species of flowering plant native to the Rocky Mountains and areas of the northern Great Plains in western North America. A herbaceous perennial it has blue-green leaves alternately arranged on its smooth flowering stalk. Its flower buds are pink-purple and become blue as they open.

<i>Penstemon whippleanus</i> Species of flowering plant

Penstemon whippleanus, commonly known as dusky penstemon, dusky beardtongue, Whipple's penstemon, or Whipple's beardtongue, is a summer blooming perennial flower in the large Penstemon genus. It is a widespread plant within the hemiboreal forests of the Rocky Mountains in North America. It is noted for the large deep purple-red flowers and a preference for high mountain elevations.

<i>Penstemon albidus</i> Species of flowering plant

Penstemon albidus, commonly known as white penstemon, white-flower beardtongue, or Red-Line Beardtongue is a very widespread perennial flower of the mixed-grass and shortgrass prairies. Its natural distribution is from Manitoba and Alberta in Canada to Texas and New Mexico in the United States. The bright white flowers for which they are named are quite attractive to both bees and hummingbird moths.

<i>Penstemon secundiflorus</i> Species of flowering plant

Penstemon secundiflorus, commonly known as sidebells penstemon, or orchid beardtoungue is a species of Penstemon that grows in dry forests, high plains, and scrub lands from Wyoming to Mexico. It is a herbaceous perennial plant that typically grows to a height of 20 to 50 cm and has narrow, lance-shaped leaves that are grayish-green in color. The flowers of the sidebells penstemon are tubular in shape and are arranged in a one-sided spike, with the blooms all facing the same direction, and for this reason was named "secundiflorus", which means "one-sided flowers". The flowers are most often delicate shades of orchid or lavender. It is sometimes used in xeriscaping, rock gardens, and wildflower meadows, and is well-suited to dry, sunny locations with well-draining soil.

<i>Penstemon ambiguus</i> Species of flowering plant

Penstemon ambiguus, commonly known as the bush penstemon, pink plains penstemon, or gilia beardtongue is a species of Penstemon that grows in the shortgrass prairies and deserts of the western United States and northern Mexico. This bush-like penstemon grows in sandy, loose, and creosote soils and is particularly known for the spectacular flowering show it produces, sometime seasons turning whole hillsides bright pink–white.

<i>Penstemon auriberbis</i> Species of flowering plant

Penstemon auriberbis, commonly known as the Colorado penstemon or Colorado beardtongue, is a species of Penstemon that grows in the shortgrass prairies of southern Colorado and in a few places in northern New Mexico. Although specimens were collected on the 1820 expedition by Stephen H. Long through the area, they were not scientifically described as a separate species until 1920.

<i>Penstemon caespitosus</i> Species of flowering plant

Penstemon caespitosus, commonly known as mat penstemon, is a summer blooming perennial flower in the large Penstemon genus. It is a widespread plant from near timberline to the foothills in the Southern Rocky Mountains and Colorado Plateau in North America. It is noted for its ground hugging growth habit and as a plant used in xeriscape and rock gardening.

<i>Penstemon teucrioides</i> Colorado endemic species of penstemon

Penstemon teucrioides, commonly known as grayleaf creeping penstemon, germander penstemon and germander beardtounge, is a perennial species of plant in the large and colorful Penstemon genus. It is a ground hugging plant that is native to just five counties in the mountains of Colorado. Though it has a very limited range it is widely grown in rock gardens.

<i>Penstemon arenicola</i> Plant species in the family

Penstemon arenicola, commonly known as Red Desert penstemon, is a species of plant from the Western United States. It primarily grows in Wyoming, but it also grows in small areas of Colorado and Utah. It is a short plant known for growing in sand as referenced by its scientific name.

References

  1. 1 2 3 4 5 6 NatureServe (2023). "Penstemon grandiflorus". NatureServe Explorer. Arlington, Virginia: NatureServe. Retrieved 7 October 2023.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 Freeman, Craig C. (5 November 2020). " Penstemon grandiflorus Nuttall - FNA". Flora of North America. Retrieved 7 October 2023.
  3. 1 2 Cirigliano, Jim, ed. (2023). National Audubon Society Wildflowers of North America (1st ed.). New York: Alfred A. Knopf. p. 601. ISBN   978-0-593-31994-9.
  4. 1 2 3 4 5 6 7 8 Diboll, Neil; Hilary, Cox (2023). The Gardener's Guide to Prairie Plants (1st ed.). Chicago, Illinois: The University of Chicago Press. pp. 286–287. ISBN   978-0-226-80593-1.
  5. ↑ Pursh, Frederick Traugott (1814). Flora Americae Septentrionalis: Or, A Systematic Arrangement and Description of the Plants of North America. London: White, Cochrane, and Co. p. 738. Retrieved 2 December 2023.
  6. ↑ Stearn, W.T. (1943). "The Date of Publication of Pursh's Flora Americae Septentrionalis". Rhodora. 45 (538): 415. Retrieved 2 December 2023.
  7. 1 2 3 4 5 6 "Penstemon bradburyi Pursh". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 2 December 2023.
  8. 1 2 Cronquist, Arthur; Keck, David D.; Maguire, Bassett (1956). "Validity of Nuttall's Names in Fraser's Catalogue". Rhodora. 58 (685). Cambridge, Massachusetts: New England Botanical Club: 23–24. Retrieved 6 December 2023.
  9. ↑ Pennell, Francis W. (1 January 1921). "Scrophulariaceae of the West Gulf States". Proceedings of the Academy of Natural Sciences of Philadelphia. 73. Academy of Natural Sciences of Philadelphia: 486. Retrieved 25 August 2023.
  10. ↑ Reveal, James L. (1968). "On the Names in Fraser's 1813 Catalogue". Rhodora. 70 (781). The New England Botanical Club: 46. Retrieved 2 December 2023.
  11. ↑ IPNI (2023). "Catalogue of New and Interesting Plants Collected in Upper Louisiana and Principally on the River Missouri, North America, for Sale at Messrs. Fraser's Nursery for Curious American Plants, Sloane, Square, King's Road, Chelsea, [London 1813]". International Plant Names Index. The Royal Botanic Gardens, Kew, Harvard University Herbaria & Libraries and Australian National Herbarium. Retrieved 21 February 2023.
  12. 1 2 Hassler, Michael (1 December 2023). "Penstemon". World Plants. Synonymic Checklist and Distribution of the World Flora. Version 18.2. Retrieved 2 December 2023.
  13. ↑ WFO (2023). "Penstemon bradburyi Pursh". World Flora Online. Retrieved 2 December 2023.
  14. ↑ WFO (2023). "Penstemon grandiflorus Nutt". World Flora Online. Retrieved 2 December 2023.
  15. ↑ "Penstemon grandiflorus". Plant Finder. Missouri Botanical Garden. Retrieved 7 October 2023.
  16. 1 2 3 4 Penstemon grandiflorus Nutt., USDA Natural Resources Conservation Service PLANTS Profile, 7 October 2023
  17. ↑ Henson, Yvette; Langelo, Linda (February 2021). "Growing Penstemons - 7.428". Extension. Fort Collins, Colorado: Colorado State University. Retrieved 12 October 2023.
  18. ↑ Hawks, Lindsay (15 July 2013). "Large-flowered Penstemon" (PDF). Minnesota Board of Water and Soil Resources. Archived (PDF) from the original on 29 January 2022. Retrieved 5 December 2023.
  19. 1 2 Kindscher, Kelly (1992). Medicinal Wild Plants of the Prairie : an Ethnobotanical Guide (1st ed.). Lawrence: University Press of Kansas. p. 267. ISBN   0700605274.
  20. 1 2 Davis, Mark A.; Villinski, Jeff; McAndrew, Sarah; Scholtz, Heidi; Young, Elisabeth (March 1991). "Survivorship of Penstemon grandiflorus in an Oak Woodland: Combined Effects of Fire and Pocket Gophers". Oecologia. 86 (1): 113–118. Bibcode:1991Oecol..86..113D. doi:10.1007/BF00317397. JSTOR   4219575. PMID   28313166. S2CID   21457935 . Retrieved 2 December 2023.
  21. ↑ "Checklist of Illinois Endangered and Threatened Animals and Plants" (PDF). Illinois Department of Natural Resources. Illinois Endangered Species Protection Board. 28 May 2020. Archived from the original (PDF) on 9 August 2022. Retrieved 8 December 2023.
  22. ↑ "Checklist of Illinois Endangered and Threatened Animals and Plants" (PDF). Illinois Endangered Species Protection Board. 28 May 2020. Retrieved 4 February 2022.
  23. ↑ Greenlee, John (2009). The American Meadow Garden : Creating a Natural Alternative to the Traditional Lawn. Portland, Oregon: Timber Press. p. 110. ISBN   978-0-88192-871-6 . Retrieved 6 December 2023.
  24. ↑ Hitchmough, James (2017). Sowing Beauty : Designing Flowering Meadows From Seed. Portland, Oregon: Timber Press. ISBN   978-1-60469-632-5 . Retrieved 6 December 2023.
  25. 1 2 3 "Prairie Jewel® penstemon". Plant Select. 26 February 2015. Archived from the original on 25 March 2023. Retrieved 6 December 2023.
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