Dioon edule
| Chestnut dioon | |
|---|---|
| |
Scientific classification 
| |
| Kingdom: | Plantae |
| Clade: | Tracheophytes |
| Clade: | Gymnospermae |
| Division: | Cycadophyta |
| Class: | Cycadopsida |
| Order: | Cycadales |
| Family: | Zamiaceae |
| Genus: | Dioon |
| Species: | D. edule
|
| Binomial name | |
| Dioon edule | |
| Synonyms | |
| |
Dioon edule, the chestnut dioon, is a
Two subspecies are known, the nominate subspecies growing in a moister environment than the other:
- Dioon edule subsp. angustifolium
- Dioon edule subsp. edule
Anatomy
Dioon edule is easily distinguished from other Dioon species because it lacks spines on the borders of
Habitat
Dioon edule is endemic to the eastern coast of Mexico. It is commonly found distributed throughout the
Ecology and distribution
One of the ways in which cycads are identified includes leaflet characteristics, which were not heavily studied when cycads were first identified. In subsequent studies it was found that leaflet width was related to geographic dispersal. Wider leaves typical of Dioon edule subsp. edule are found in the south whereas the narrower leaves of D. edule subsp. angustifolium are found to the north. Evidence suggests D. edule subsp. edule was much more widespread than it is today and became fragmented thus allowing for
In addition,
Endangerment
Both subspecies of Dioon edule are on the verge of becoming
Dioon edule var. edule
Dioon edule var. edule is commonly called the chestnut dioon and is endemic to the eastern coast of Mexico. D. edule was originally described by John Lindley in 1843. There are currently two subspecies known: D. edule subsp. edule and D. edule subsp. angustifolium.
Pictures
Dioon means "two-egged"
References and external links
- . Retrieved 12 November 2021.
- Saint Louis, Missouri: Missouri Botanical Garden. Retrieved February 15, 2010.
Annotation: as 'Dion' ; orth. & nom. cons.
Type Specimen: Dioon edule Lindl. - ^ United States Botanical Garden
- ^ Chamberlain, Charles J. (1965). The Living Cycads. Reprint. New York: Hafner Pub. Co. pp. 97–99.
- Stevenson, D. W., R. Osborne & J. Hendricks. A world list of cycads Memoirs of the New York Botanical Garden 57: 200-206 (1990)
- The Cycad Pages: Dioon edule
- Dioon edule original description by J. Lindley (1843).[permanent dead link]
- Chemnick, J.; Gregory, T. (2010). "Dioon edule". . Retrieved 12 November 2021.
- Compton, R. H, and F. W. South . "Notes From the Cambridge Botany School on the Anatomy of the Dioon Edule Lindle.." New Phytologist 7(1908): 222-229.
- de Luca, Paolo, Sergio Sabato, and Mario Vasquez. "Distribution and Variation of the Dioon Edule." Brittonia 34(1982): 355-362.
- Octavio-Aguilar, Pablo, Jorge Gonzalez-Astorgas, and Andrew P. Vovides. "Population Dynamics of the Mexican Cycad Dioon Edule Lindl. (Zamiaceae) Life History Stages and Management Need." Botanical Journal of the Linnean Society 157(2008): 381-391.
- "Rare and Endangered Plants." 2008. United States Botanical Garden. 2 May 2009 [1]
- Vovides, Andrew P. "Spatial Distribution, Survival and Fecundity of the Dioon edule (Zamiaceae) in Tropical Deciduous Forests in Velacruz, Mexico with Notes on its Habitat.” The American Journal of Botany 77(1990): !532-1543.
- Whitelock, Loran M. "Variation in the Mexican Cycad Dioon Edule (Zamiaceae)." The Botanical Review 70(240-249): 2009.