Dudleya blochmaniae

Last updated

Dudleya blochmaniae
Dudleyablochmaniae.jpg
Blochman's Dudleya imported from iNaturalist photo 31588104 on 24 October 2021.jpg
Flowering (top) and basal leaves (bottom)
Status TNC G2.svg
Imperiled  (NatureServe)
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Order: Saxifragales
Family: Crassulaceae
Genus: Dudleya
Species:
D. blochmaniae
Binomial name
Dudleya blochmaniae
(Eastw.) Moran
Dudleya blochmaniae range map.png
Range map of Dudleya blochmaniae ssp. blochmaniae (green), Dudleya blochmaniae ssp. insularis (red), and Dudleya brevifolia (blue)
Synonyms [1] [2] [3]
  • Sedum blochmaniaeEastw.
subsp. blochmaniae
  • Hasseanthus blochmaniaeRose
  • Hasseanthus kessleriDavidson
  • Sedum gertrudianumEastw.
subsp. insularis
  • Hasseanthus blochmaniae subsp. insularisMoran
  • Hasseanthus insularis(Moran) P.H.Thomson

Dudleya blochmaniae is a summer-deciduous succulent plant known by the common names Blochman's liveforever or Blochman's dudleya. This species of Dudleya survives part of the year with no aboveground presence, surviving as underground corm-like roots in deciduous months. It is characterized by white, star-shaped and spreading flowers that emerge after sufficient rainfall. It is found along the Pacific coast of the California Floristic Province, from the vicinity of San Luis Obispo in California to Punta Colonet in Baja California.

Contents

Description

Vegetative morphology

This plant forms a basal rosette from an underground corm. The small rosette is around only 0.5 to 7 cm, and the leaves are summer deciduous. The leaves are 1 to 6 cm long, more or less shaped, oblanceolate to club-shaped, and when removed from the plant, the point of detachment will turn red with the wound. The leaves are 1 to 4 mm wide, and their tip is acute to rounded. The leaf petiole is more or less narrow. [4]

Plants emerging in the rain Blochman's Dudleya imported from iNaturalist photo 33169295 on 27 December 2021.jpg
Plants emerging in the rain

Reproductive morphology

The inflorescence branches 2 to 3 times, and then may or may not rebranch once more. The terminal branches on the inflorescence are 1 to 6 cm long, and have 3 to 10 flowers. The lower bracts on the inflorescence are often more than twice as long as they are wide. The pedicels are less than 1 mm long. The flower is white and star shaped. The sepals are 1.5 to 4 mm long, shaped deltate to ovate. The petals spread from the base, and are 5 to 10 mm large, shaped elliptic, with an acute tip, and colored white. The keel of the petals is often lined with a red-lineolate color. [4] [5]

Subspecies blochmaniae flowering in habitat. Blochman's Dudleya imported from iNaturalist photo 82336624 on 24 October 2021.jpg
Subspecies blochmaniae flowering in habitat.

Subdivisions

Named subspecies include:

Dudleya blochmaniaeEastwood (Moran)subsp. blochmaniae
Conservation status
Status TNC T2.svg [6]
Imperiled Subspecies (NatureServe)

Known by the common name Blochman'sliveforever or Blochman'sdudleya. It is found from San Simeon, California south to Punta Colonet, Baja California. It is also found on Santa Cruz Island. [7]

The plant forms a basal rosette consisting of 3 to 12 leaves. The leaf blade is shaped shaped oblanceolate, 1 to 4 cm long. The floral stems are 3 to 12 cm long, and bracts 0.5 to 1.4 cm large. The young stems and leaves may be slightly glaucous. The petals are 6 to 10 mm long. [7]

Flowering April to June. Chromosome number is n = 17, 34, 51. Occurs on open, rocky slopes and on serpentine or clay-dominated soils, typically below an elevation of 450 meters. [7]

Dudleya blochmaniae(Eastwood) Moransubsp. insularis(Moran) Moran
Conservation status
Status TNC T1.svg [8]
Critically Imperiled Subspecies (NatureServe)

Known by the common name Santa Rosa Island liveforever or Santa Rosa Island dudleya. Endemic to Santa Rosa Island, where it is only found near Old Ranch Point. [9]

The basal rosette has a high number of leaves for the plant's size, 15 to 30, but sometimes up to 50. The leaf blade is shaped clavate-oblanceolate, 1 to 3.5 cm. The floral stems are 3 to 7 cm long, and the bracts 0.6 to 1.2 cm large. The young stems and leaves are gray-glaucous. The petals are 6 to 8 mm long. [9] [10]

Flowering April to June. Chromosome number is n = 17. Occurs on heavy soil on coastal bluffs, from 3 to 90 meters. [9] [10]

Conservation

This species is of conservation concern, as suitable habitat sites are rapidly declining and face serious threats. Threats include development, urbanization, vehicles, recreation, grazing by feral herbivores, and exotic plants. In 1998 there were only twenty-four confirmed extant sites in California, out of a total of thirty-six sites. In Baja California, this species is represented from fewer than five occurrences. [11]

Cultivation

This species is a corm-like succulent that flowers in late spring to early summer. It often blooms less than a year after being sowed. Plants may disappear if they are placed in locations with high rainfall. [12]

Related Research Articles

<i>Dudleya virens</i> Species of succulent

Dudleya virens, the green liveforever or bright green dudleya, is an uncommon species of perennial, succulent plant in the family Crassulaceae, native to several coastal southern California and Baja California locations.

<i>Dudleya</i> North American succulent genus

Dudleya, commonly known as liveforevers is a genus of rosette-forming succulent plants in the stonecrop family, Crassulaceae, consisting of about 68 taxa in southwestern North America and Guadalupe Island. The species come in many forms, with some large and evergreen, others geophytic and deciduous, but despite their dramatic variations in appearance, most species readily hybridize. The flowers of Dudleya have parts numbered in 5, with the petals arranged in tubular, star-shaped, and bell-shaped forms, and when fruiting are filled with tiny, ovoid to crescent-shaped seeds.

<i>Dudleya abramsii <span style="font-style:normal;">subsp.</span> setchellii</i> Species of succulent

Dudleya abramsiisubsp. setchellii, known by common name as the Santa Clara Valley dudleya or Santa Clara Valley liveforever, is a member of the Dudleya genus of succulent perennials, members of the family Crassulaceae. The Santa Clara Valley dudleya, endemic to the Santa Clara Valley region in the southern San Francisco Bay Area, was listed on 3 February 1995, as an endangered species. It is considered to be a subspecies of Dudleya abramsii, but its taxonomic status is still unclear. Its closest relative is Dudleya cymosa subsp. paniculata, which is a morphologically similar sister taxon.

<i>Dudleya densiflora</i> Species of succulent

Dudleya densiflora is a species of succulent plant in the family Crassulaceae known commonly as the San Gabriel Mountains liveforever or San Gabriel Mountains dudleya. A very rare plant confined to the San Gabriel Mountains of Los Angeles County, California, it is known only from three to five spots in the mountain range, with an estimated 1,700 individual plants remaining. Growing in the cracks of the granite slopes of three canyons in this single mountain range, it is threatened by human activity such as rock quarrying and off-trail recreation.

<i>Dudleya lanceolata</i> Species of succulent

Dudleya lanceolata is a succulent plant known by the common name lanceleaf liveforever or lance-leaved dudleya. It is an extremely variable and widely ranging species that occurs from Monterey County and Kern County in California south through Ensenada in Baja California. It is characterized by green to purple lanceolate leaves, red, orange, or less commonly yellow petals, and is typically tetraploid. Despite its diversity, it is quite stable as a species, but hybrids may be discovered with other species of Dudleya, which can make it difficult to discern in areas where numerous species converge.

<i>Dudleya multicaulis</i> Species of succulent

Dudleya multicaulis is a succulent plant known by the common name manystem liveforever or many-stemmed dudleya. This Dudleya is endemic to southern California, where it is rare and seriously threatened as its habitat is altered by humans. Many occurrences of this species have been extirpated. This species is characterized by a few short, fingerlike cylindrical leaves with pointed tips, and its erect peduncle, which is topped with a branching inflorescence bearing up to 15 flowers on each long, thin branch. The flowers, which appear in late spring, have pointed yellow petals and long stamens. It is usually found on heavy clay or rocky soils and outcrops.

<i>Dudleya pulverulenta</i> Species of succulent plant found in the U.S. and Mexico

Dudleya pulverulenta is a species of perennial succulent plant known by the common names chalk lettuce, chalk dudleya, and chalk liveforever. It is one of the largest Dudleya, with a silvery, waxy rosette that may greatly contrast with its habitat. It is also regarded as one of the most distinctive members of the Dudleya, with the most advanced inflorescence in the genus, consisting of pendant, hummingbird pollinated flowers, the longest corolla, and the highest nectar output, along with the largest range of all the Dudleya, over 1,000 kilometres (620 mi), being found from southern Monterey County in California to the Sierra de San Borja in southern Baja California.

<i>Dudleya brevifolia</i> Rare, small species of succulent plant found in San Diego County

Dudleya brevifolia, is a rare succulent plant known by the common name short-leaved liveforever, short-leaved dudleya or rarely the Del Mar Hasseanthus. It is an edaphic endemic that only grows on the mesas of the most ancient marine terraces, hiding in the vicinity of ironstone concretions. The leaves are deciduous, and disappear after the inflorescence develops. The small white flowers are star-shaped with a yellow center. After flowering, any above ground trace of the plant will disappear, and it survives under the earth with a starch-rich subterranean caudex. Dudleya brevifolia is only found on coastal mesas along a small strip of coast in San Diego County, California.

<i>Dudleya greenei</i> Species of succulent

Dudleya greenei is a perennial species of succulent plant known by the common names Greene's liveforever, or Greene's dudleya. It is endemic to the Channel Islands of California, where it grows along the cliffs of four of the eight islands. It is a highly variable plant, presenting with multiple forms and varying levels of ploidy. Taxonomically, this species is an insular segregate of Dudleya caespitosa, and was placed as a stopgap taxon by Reid Moran in his 1951 thesis on the genus. It is characterized by white or green leaf rosettes, loomed over by inflorescences bearing pale yellow to white flowers. It is a member of the subgenus Dudleya, as it cannot be propagated from leaf cuttings, does not grow from a corm, and has tight petals.

<i>Dudleya abramsii</i> Species of succulent

Dudleya abramsii is a species complex of succulent plants native to California and parts of Baja California. There are numerous subspecies, some critically endangered, with varying habits and lifestyles, but most often characterized by a smaller size, yellow flowers, and an affinity for rocky habitats. The subspecies may be polyphyletic.

<i>Dudleya variegata</i> Species of succulent

Dudleya variegata is a deciduous succulent plant in the family Crassulaceae known by the common names variegated liveforever, variegated dudleya or rarely San Diego Hasseanthus. A cryptic plant that survives part of the year dormant underground from starch reserves in a corm, after sufficient rainfall, leaves will emerge, soon giving way to small inflorescences with yellow star-shaped flowers. It is native to Baja California and adjacent San Diego County in California, where it grows in several habitat types, including chaparral and vernal pools.

<i>Dudleya parva</i> Subspecies of succulent

Dudleya parva, known by common name as the Conejo dudleya, is a species of deciduous succulent plant native to the Conejo Valley and surrounding regions. It blooms from May to June, and has vernal leaves. It is only found from the western end of Simi Hills along the Montclef Ridge to the Conejo Grade in Newbury Park.

<i>Dudleya abramsii <span style="font-style:normal;">subsp.</span> abramsii</i> Subspecies of succulent plant

Dudleya abramsii subsp. abramsii is a species of succulent plant in the family Crassulaceae known by the common name as Abrams' liveforever. It is a small, delicate plant found growing among rocks, and is characterized by yellow flowers with a red tinge that emerge from May to July. It is native to the southern Sierra Nevada of California and the Peninsular Ranges across both the United States and Mexico.

<i>Dudleya abramsii <span style="font-style:normal;">subsp.</span> affinis</i> Subspecies of plant

Dudleya abramsii subsp. affinis, commonly known as the San Bernardino Mountains Dudleya, is a subspecies of succulent plant endemic to a portion of the San Bernardino Mountains in California. It is a plant with an unbranching stem and elliptical leaves occurring in Green Canyon and the nearby plateaus.

Dudleya cymosasubsp. costatifolia, known commonly as the Pierpoint Springs dudleya or the Pierpoint Springs liveforever, is a species of succulent plant in the family Crassulaceae, narrowly endemic to a locality in Tulare County, California, United States. It is a clumping plant with small rosettes and bright yellow flowers, resembling alpine cushion plants.

<i>Dudleya cymosa <span style="font-style:normal;">subsp.</span> pumila</i> Subspecies of plant

Dudleya cymosasubsp. pumila, most commonly known as the low canyon dudleya, chalky canyon dudleya or California live-forever, is a species of perennial succulent plant. It has diamond to spoon shaped leaves, sometimes coated with a fine white powder, and in May through July, bright red, orange or yellow flowers adorn the short inflorescence. A leaf succulent primarily found growing in rocky cliffs and slopes, it is endemic to California, and grows in the Transverse Ranges and South Coast Ranges, with some outlying populations. A variable plant, in some localities it is difficult to distinguish from other plants in the genus.

<i>Dudleya saxosa <span style="font-style:normal;">subsp.</span> aloides</i> Subspecies of perennial succulent plant

Dudleya saxosasubsp. aloides is a species of perennial succulent plant in the family Crassulaceae known by the common names desert dudleya or desert savior. It is a rosette-forming species widely distributed throughout the Peninsular Ranges and desert mountains of California in the United States. It is characterized by bright-yellow or greenish-yellow flowers, and can be found in shaded crevices and slopes. Plants in western half of the range may grade into Dudleya lanceolata.

<i>Dudleya cymosa <span style="font-style:normal;">subsp.</span> cymosa</i> Subspecies of succulent perennial plant

Dudleya cymosasubsp. cymosa is a species of succulent perennial plant in the family Crassulaceae native to California. It is the autonymous subspecies for Dudleya cymosa, and is known by the common name canyon liveforever. It is native to the California Coast Ranges, the Sierra Nevada and the Santa Monica Mountains. It is characterized by bright-yellow, orange or red flowers and broad, wide leaves. This plant is commonly found growing on rocky outcrops, talus slopes, and in shaded canyons.

<i>Dudleya cymosa <span style="font-style:normal;">subsp.</span> marcescens</i> Subspecies of deciduous succulent plant

Dudleya cymosa subsp. marcescens is a species of summer-deciduous succulent plant known commonly as the marcescent dudleya or marcescent liveforever. Throughout the months of spring, it is characterized by a bloom of small, bright-yellow flowers with 5 petals, tinged with orange or red. It is a leaf succulent with a basal rosette, with the foliage withering in summer, going completely leafless, a neotenous trait in the genus. This species is endemic to the exposed volcanic rock of the Santa Monica Mountains in California, being found on shady slopes and outcroppings. It differs from its local congeners with its deciduous habit, slender caudex, and narrower leaf shape, although it is superseded in some of these characteristics by Dudleya parva, growing 13 km to the north, which has even narrower leaves and is quicker to lose them. Because of its restricted distribution and small size, it is vulnerable to habitat degradation and disturbance from acts of graffiti and rock climbers. It is listed as threatened by the United States Fish and Wildlife Service.

<i>Dudleya cymosa <span style="font-style:normal;">subsp.</span> agourensis</i> Subspecies of flowering plant

Dudleya cymosasubsp. agourensis, commonly known as the Agoura Hills dudleya or Agoura Hills liveforever, is a species of perennial succulent plant. A rare and critically imperiled species from the Santa Monica Mountains in California, it is characterized by glaucous, gray-purple leaves, bright yellow flowers, and ascending bracts. A leaf succulent, it is found growing on west to northwest-facing open, rocky volcanic slopes.

References

  1. "Dudleya blochmaniae". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 1 February 2022.
  2. "Dudleya blochmaniae subsp. blochmaniae". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 1 February 2022.
  3. "Dudleya blochmaniae subsp. insularis". Plants of the World Online . Royal Botanic Gardens, Kew . Retrieved 1 February 2022.
  4. 1 2 McCabe, Stephen Ward (2012). "Dudleya blochmaniae". Jepson eFlora. Jepson Flora Project (eds.). Archived from the original on 2016-08-15. Retrieved 23 December 2021.
  5. Moran, Reid. "Dudleya blochmaniae". Flora of North America. 8: 193. Retrieved 23 December 2021 via efloras.org.
  6. "Dudleya blochmaniae ssp. blochmaniae". NatureServe Explorer. Arlington, Virginia: NatureServe. 2021. Archived from the original on 2020-09-19. Retrieved 23 December 2021.
  7. 1 2 3 McCabe, Stephen Ward (2012). "Dudleya blochmaniae subsp. blochmaniae". Jepson eFlora. Jepson Flora Project (eds.). Archived from the original on 2017-08-29. Retrieved 23 December 2021.
  8. "Dudleya blochmaniae ssp. insularis". NatureServe Explorer. Arlington, Virginia: NatureServe. 2021. Archived from the original on 2021-12-24. Retrieved 23 December 2021.
  9. 1 2 3 Moran, Reid. "Dudleya blochmaniae subsp. insularis". Flora of North America. 8: 194. Retrieved 23 December 2021 via efloras.org.
  10. 1 2 McCabe, Stephen Ward (2012). "Dudleya blochmaniae subsp. insularis". Jepson eFlora. Jepson Flora Project (eds.). Archived from the original on 2017-08-29. Retrieved 23 December 2021.
  11. "Dudleya blochmaniae". NatureServe Explorer. Arlington, Virginia: NatureServe. 2022. Retrieved 18 February 2022.
  12. "Dudleya | Pacific Bulb Society". www.pacificbulbsociety.org. Retrieved 18 February 2022.