Hexalectris

Hexalectris (crested coralroot)[2] is a genus of the family Orchidaceae, comprising 10 known species of fully myco-heterotrophic orchids.[3] These species are found in North America, with the center of diversity in northern Mexico.[4] None of the species are particularly common.[5] Hexalectris spicata has a wide distribution and is likely the most abundant member of the genus, but is nevertheless infrequent throughout its range.[5] Other species are rare, and some, such as H. colemanii, are threatened or endangered.[6] All species that have been studied form associations with ectomycorrhizal fungi that are likely linked to surrounding trees.[7] Many Hexalectris species are found in association with oak trees (Quercus), which are ectomycorrhizal.[8]

crested coralroot
Hexalectris spicata
Scientific classification
Kingdom:
Plantae
(unranked):
Angiosperms
(unranked):
Monocots
Order:
Asparagales
Family:
Orchidaceae
Subfamily:
Epidendroideae
Tribe:
Epidendreae
Subtribe:
Bletiinae[1]
Genus:
Hexalectris

Raf.
Type species
Hexalectris spicata
(Walter) Barnhart

Species

Species accepted as of June 2014:[4]

  1. Hexalectris arizonica (S.Watson) A.H.Kenn. & L.E.Watson (2010) - Arizona, New Mexico, Texas, Coahuila
  2. Hexalectris brevicaulis L.O.Williams (1940) - central and southern Mexico
  3. Hexalectris colemanii (Catling) A.H.Kenn. & L.E.Watson (2010) - southern Arizona
  4. Hexalectris fallax M.I.Rodr. & R.González (2005) - Jalisco
  5. Hexalectris grandiflora (A.Rich. & Galeotti) L.O.Williams (1944) - widespread from Texas and Chihuahua south to Oaxaca
  6. Hexalectris nitida L.O.Williams (1944) - from Texas and New Mexico to southern Mexico
  7. Hexalectris parviflora L.O.Williams (1940) - from Sonora to Guatemala
  8. Hexalectris revoluta Correll (1941) - western Texas, southeastern New Mexico, northeastern Mexico
  9. Hexalectris spicata (Walter) Barnhart (1904) - United States from Arizona east to Florida and Maryland
  10. Hexalectris warnockii Ames & Correll (1943 - Arizona, New Mexico, Texas, northern Mexico
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References
  1. Victoria Sosa "A Molecular and Borphological Phylogenetic Study of Subtribe Bletiinae (Epidendreae, Orchidaceae)" Systematic Botany (2007), 32)1): pp. 34-42 retrieved from http://www.bioone.org/doi/pdf/10.1600/036364407780360175?cookieSet=1
  2. "Hexalectris". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 14 May 2015.
  3. "Flora of North America".
  4. Kew World Checklist of Selected Plant Families
  5. Luer, Carlyle A (1975). The native orchids of the United States and Canada, excluding Florida. New York: New York Botanical Garden. OCLC 1348145.
  6. 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.
  7. 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.
  8. Coleman, Ronald A. (2005). "Populations Studies in Dichromanthus and Hexalectris in Southeastern Arizona". Selbyana. 26 (1/2): 246–250. JSTOR 41760196.
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