Hexalectris (crested coralroot)[1] is a genus of the family Orchidaceae, comprising 10 known species of fully myco-heterotrophic orchids.[2] These species are found in North America, with the center of diversity in northern Mexico.[3] None of the species are particularly common.[4] Hexalectris spicata has a wide distribution and is likely the most abundant member of the genus, but is nevertheless infrequent throughout its range.[4] Other species are rare, and some, such as H. colemanii, are threatened or endangered.[5] All species that have been studied form associations with ectomycorrhizal fungi that are likely linked to surrounding trees.[6] Many Hexalectris species are found in association with oak trees (Quercus), which are ectomycorrhizal.[7]
| Crested coralroot | |
|---|---|
| |
| Hexalectris spicata | |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Angiosperms |
| Clade: | Monocots |
| Order: | Asparagales |
| Family: | Orchidaceae |
| Subfamily: | Epidendroideae |
| Tribe: | Epidendreae |
| Subtribe: | Bletiinae |
| Genus: | Hexalectris Raf. |
| Type species | |
| Hexalectris spicata (Walter) Barnhart
| |
Species
editSpecies accepted as of June 2014:[3]
| Image | Scientific name | Distribution |
|---|---|---|
| Hexalectris arizonica (S.Watson) A.H.Kenn. & L.E.Watson (2010) | Arizona, New Mexico, Texas, Coahuila | |
| Hexalectris brevicaulis L.O.Williams (1940) | central and southern Mexico | |
| Hexalectris colemanii (Catling) A.H.Kenn. & L.E.Watson (2010) | southern Arizona | |
| Hexalectris fallax M.I.Rodr. & R.González (2005) | Jalisco | |
| Hexalectris grandiflora (A.Rich. & Galeotti) L.O.Williams (1944) | widespread from Texas and Chihuahua south to Oaxaca | |
| Hexalectris nitida L.O.Williams (1944) | from Texas and New Mexico to southern Mexico | |
| Hexalectris parviflora L.O.Williams (1940) | from Sonora to Guatemala | |
| Hexalectris revoluta Correll (1941) | western Texas, southeastern New Mexico, northeastern Mexico | |
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Hexalectris spicata (Walter) Barnhart (1904) | United States from Arizona east to Florida and Maryland |
 |
Hexalectris warnockii Ames & Correll (1943 | Arizona, New Mexico, Texas, northern Mexico |
References
edit- ^ NRCS. "Hexalectris". PLANTS Database. United States Department of Agriculture (USDA). Retrieved 14 May 2015.
- ^ "Flora of North America".
- ^ a b Kew World Checklist of Selected Plant Families
- ^ a b Luer, Carlyle A (1975). The native orchids of the United States and Canada, excluding Florida. New York: New York Botanical Garden. OCLC 1348145.
- ^ Kennedy, Aaron H.; Watson, Linda E. (2010). "Species Delimitations and Phylogenetic Relationships within the Fully Myco-heterotrophic Hexalectris (Orchidaceae)". Systematic Botany. 35 (1): 64–76. doi:10.1600/036364410790862489. S2CID 85734959.
- ^ Kennedy, Aaron H.; Taylor, D. Lee; Watson, Linda E. (2011-03-01). "Mycorrhizal specificity in the fully mycoheterotrophic Hexalectris Raf. (Orchidaceae: Epidendroideae)". Molecular Ecology. 20 (6): 1303–1316. doi:10.1111/j.1365-294x.2011.05000.x. ISSN 1365-294X. PMID 21255173. S2CID 17740766.
- ^ Coleman, Ronald A. (2005). "Populations Studies in Dichromanthus and Hexalectris in Southeastern Arizona". Selbyana. 26 (1/2): 246–250. JSTOR 41760196.
External links
edit
Media related to Hexalectris at Wikimedia Commons
Data related to Hexalectris at Wikispecies
