Phacelia

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Phacelia
Phacelia tanacetifolia 7735.JPG
Phacelia tanacetifolia
Scientific classification Red Pencil Icon.png
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Eudicots
Clade: Asterids
Order: Boraginales
Family: Boraginaceae
Subfamily: Hydrophylloideae
Genus: Phacelia
Juss.
Type species
Phacelia secunda
Diversity
About 200 species
Synonyms

Eutoca R.Br.

Phacelia (phacelia, scorpionweed, heliotrope ) is a genus of about 200 species of annual or perennial herbaceous plants in the borage family, native to North and South America. California is particularly rich in species with over 90 recorded in the region. [1]

Contents

The genus is traditionally placed at family rank with the waterleafs (Hydrophyllaceae) in the order Boraginales. The Angiosperm Phylogeny Group, recognizing that the traditional Boraginaceae and Hydrophyllaceae are paraphyletic with respect to each other, merges the latter into the former and considers the family basal in the Euasterids I clade. Other botanists [2] continue to recognize the Hydrophyllaceae and Boraginales after analysing the secondary structure of the ITS1 genetic region rather than its sequence for these higher taxonomic levels. This placed Phacelia within the Hydrophyllaceae. [2] Further molecular taxonomic analysis of the Boraginales has divided the Boraginales in two and placed Phacelia among the monophyletic herbaceous Hydrophyllaceae in Boraginales II. [3]

The genus includes both annual and perennial species. [1] Many have been cultivated as garden and honey plants.

There are reports that glandular hairs of stems, flowers and leaves of some species of Phacelia secrete oil droplets that can cause an unpleasant skin rash (contact dermatitis) in some people, specifically from P. brachyloba, [4] P. campanularia, [5] P. crenulata, [4] [6] P. gina-glenneae, [7] P. grandiflora, [4] P. ixodes, [5] P. minor, [8] and P. pedicellata. [4] [5] The major contact allergen of P. crenulata has been identified as geranyl hydroquinone and of P. minor as geranylgeranylhydroquinone. [8]

The mining bee Andrena phaceliae is a specialist pollinator of this genus in the Eastern United States

Selected species

See also

Related Research Articles

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Boraginaceae, the borage or forget-me-notfamily, includes about 2,000 species of shrubs, trees and herbs in 146, to 156 genera with a worldwide distribution.

<span class="mw-page-title-main">Hydrophylloideae</span> Subfamily of plants

Hydrophylloideae is a subfamily of the plant family Boraginaceae. Their taxonomic position is somewhat uncertain. Traditionally, and under the Cronquist system, they were given family rank under the name Hydrophyllaceae, and treated as part of the order Solanales. More recent systems have recognised their close relationship to the borage family, Boraginaceae, initially by placing Hydrophyllaceae and Boraginaceae together in an order Boraginales, and most recently by demoting Hydrophyllaceae to a subfamily of Boraginaceae. However the placement and circumscription of Boraginaceae is still uncertain: it is unplaced at order level, and there is some prospect of it being split up again in future.

<span class="mw-page-title-main">Contact dermatitis</span> Human disease

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<i>Heliotropium</i> Genus of flowering plants in the borage family Boraginaceae

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<i>Phacelia minor</i> Species of plant

Phacelia minor, with the common names Whitlavia and wild Canterbury bells, is a species of phacelia. It is native to Southern California and Baja California, where it grows in the Colorado Desert and the coastal and inland mountains of the Transverse-Peninsular Ranges, often in chaparral and areas recently burned.

<i>Wigandia caracasana</i> Species of evergreen flowering plant from Central America

Wigandia caracasana, the Caracus wigandia, is a species of ornamental plant. It is an evergreen that grows to a height of up to 3 metres (10 ft). It has purple flowers in large clusters from spring to autumn. Some sources treat it as a variety of the species Wigandia urens. Native to Central America, it is thought to be naturalized in southern California as a garden escape. It is commonly grown in gardens, and thrives best in a mixture of loam and peat. Cuttings in sand will strike if placed under glass and in heat.

Hoplestigma is a genus of flowering plants in the family Boraginaceae, although this is disputed, and it has been placed in its own family Hoplestigmataceae. Its two species are native to Cameroon, Gabon, Ivory Coast and Liberia in western tropical Africa.

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<i>Codon</i> (plant) Genus of flowering plants

Codon is a small genus of plants from South Africa in the family Codonaceae in the order Boraginales. The genus Codon comprises two species.

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<i>Coldenia</i> Genus of flowering plants

Coldenia, named after C. Colden, is a monotypic genus of flowering plants traditionally included in the borage family, Boraginaceae sensu lato. It was assigned to the subfamily Ehretioideae, but molecular data revealed it to be more closely related to the genus Cordia, so that other authors placed in Cordioideae. Subsequently, it was placed in its own family, Coldeniaceae, within the Boraginales order, by the Boraginales Working Group.

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<i>Euploca</i> Genus of flowering plants in the borage family Boraginaceae

Euploca is an almost cosmopolitan genus of plants with around 100 species. It was first described by Thomas Nuttall in 1837. While part of the broadly defined Boraginaceae in the APG IV system from 2016, a revision of the order Boraginales from the same year includes Euploca in the separate family Heliotropiaceae. Its species used to be classified in the genera Hilgeria and Schleidenia and in Heliotropium sect. Orthostachys, but were found to form an independent lineage in a molecular phylogenetic analysis, more closely related to Myriopus than to Heliotropium. While many species use the C4 photosynthetic pathway, there are also C3–C4 intermediate species. Species have leaves with a C4-typical Kranz anatomy.

References

  1. 1 2 Gilbert, Cynthia; Dempcy, John; Ganong, Constance; Patterson, Robert; Spicer, Greg S (2005). "Phylogenetic Relationships within Phacelia subgenus Phacelia (Hydrophyllaceae) Inferred From Nuclear rDNA ITS Sequence Data". Systematic Botany. 30 (3): 627–634. doi:10.1600/0363644054782251. S2CID   85948949 . Retrieved 11 November 2020.
  2. 1 2 Gottschling, M; Hilger, H H; Wolf, M; Diane, N (2001). "Secondary Structure of the ITS1 Transcript and its Application in a Reconstruction of the Phylogeny of Boraginales". Plant Biology. 3 (6): 629–636. doi:10.1055/s-2001-19371 . Retrieved 11 November 2020.
  3. Weigend, Maximilian; Luebert, Federico; Gottschling, Marc; Couvreur, Thomas L.P.; Hilger, Hartmut H.; Miller, James S. (2013). "From capsules to nutlets—phylogenetic relationships in the Boraginales". Cladistics. 30 (5): 508–518. doi:10.1111/cla.12061. PMID   34794245. S2CID   11954615 . Retrieved 11 November 2020.
  4. 1 2 3 4 Munz, Phillip A (1932). "Dermatitis produced by Phalecia (Hydrophyllaceae)". Science. 74 (1965): 174. doi:10.1126/science.76.1965.194.a. PMID   17795320. S2CID   239784768 . Retrieved 11 November 2020.
  5. 1 2 3 Reynolds, Gary W.; Epstein, William L. (1986). "Unusual contact allergens From plants in the family Hydrophyllaceae". Contact Dermatitis. 14 (1): 39–44. doi:10.1111/j.1600-0536.1986.tb01150.x. PMID   3948508. S2CID   30674931.
  6. Berry, C. Z., et al. (1962). Dermatitis venenata from Phacelia crenulata. Archives of Dermatology 85(6), 737-39.
  7. Edgar, Leith. "Service Botanist Discovers Native Colorado Flower". US Fish and Wildlife Service. Retrieved 11 November 2020.
  8. 1 2 Reynolds, Gary; Epstein, William; Terry, Diane; Rodriguez, Eloy (1980). "A potent contact allergen of Phacelia (Hydrophyllaceae)". Contact Dermatitis. 6 (4): 272–274. doi:10.1111/j.1600-0536.1980.tb04929.x. PMID   7398286. S2CID   42561206.

Further reading