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Monocotyledons / Monocotiledóneas
Dioscorea mexicana Scheidw.
EOL Text
Isotype for Dioscorea tuerckheimii R. Knuth
Catalog Number: US 933706
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): H. von Türckheim
Year Collected: 1900
Locality: Cubilquitz, Alta Verapaz, Guatemala, Central America
Elevation (m): 350 to 350
- Isotype: Knuth, R. G. P. 1917. Notizbl. Bot. Gart. Berlin-Dahlem. 7: 203.
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| Rights holder/Author | This image was obtained from the Smithsonian Institution. Unless otherwise noted, this image or its contents may be protected by international copyright laws. |
| Source | http://collections.mnh.si.edu/search/botany/?irn=2127415 |
Type collection for Dioscorea astrostigma Uline
Catalog Number: US 933637
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): J. Donnell Smith
Year Collected: 1892
Locality: Zacatepequez, Volcan Fuego., Guatemala, Central America
Elevation (m): 1524 to 1524
- Type collection: Uline, E. B. 1896. Bot. Jahrb. Syst. 22: 431.
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| Rights holder/Author | This image was obtained from the Smithsonian Institution. Unless otherwise noted, this image or its contents may be protected by international copyright laws. |
| Source | http://collections.mnh.si.edu/search/botany/?irn=2156689 |
Isotype for Dioscorea anconensis R. Knuth
Catalog Number: US 1167220
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Card file verified by examination of alleged type specimen
Preparation: Pressed specimen
Collector(s): E. P. Killip
Year Collected: 1922
Locality: Ancon Hill., Panama, Central America
- Isotype: Knuth, R. G. P. 1930. Repert. Spec. Nov. Regni Veg. 28: 82.
| License | http://creativecommons.org/licenses/by/3.0/ |
| Rights holder/Author | This image was obtained from the Smithsonian Institution. Unless otherwise noted, this image or its contents may be protected by international copyright laws. |
| Source | http://collections.mnh.si.edu/search/botany/?irn=2154460 |
Type collection for Dioscorea astrostigma Uline
Catalog Number: US 258614
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): J. Donnell Smith
Year Collected: 1892
Locality: Zacatepequez, Volcan de Fuego., Guatemala, Central America
Elevation (m): 1700 to 1700
- Type collection: Uline, E. B. 1896. Bot. Jahrb. Syst. 22: 431.
| License | http://creativecommons.org/licenses/by/3.0/ |
| Rights holder/Author | This image was obtained from the Smithsonian Institution. Unless otherwise noted, this image or its contents may be protected by international copyright laws. |
| Source | http://collections.mnh.si.edu/search/botany/?irn=2152000 |
Isotype for Dioscorea deamii Matuda
Catalog Number: US 579615
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Original publication and alleged type specimen examined
Preparation: Pressed specimen
Collector(s): C. C. Deam
Year Collected: 1909
Locality: W of Gualan., Guatemala, Central America
Elevation (m): 189 to 189
- Isotype: Matuda, E. 1953. Anales Inst. Biol. Univ. Nac. Mexico. 24: 60.
| License | http://creativecommons.org/licenses/by/3.0/ |
| Rights holder/Author | This image was obtained from the Smithsonian Institution. Unless otherwise noted, this image or its contents may be protected by international copyright laws. |
| Source | http://collections.mnh.si.edu/search/botany/?irn=2075183 |
Dioscorea mexicana, Mexican yam or cabeza de negro is a species of yam in the genus Dioscorea.[1]
Dioscorea mexicana is a caudiciform dioscorea having either a partly to completely above-ground dome-shaped caudex with a thick, woody outer layer up to 3 feet(90 cm) in diameter and 8-10 inches(20 to 25 cm) in height. The caudex of D. mexicana is divided into regular polygonal plates that become protuberant with age, and separated by deep fissures. The vigorous annual vines which may reach 30 feet (9 m) long before dying back in winter, that grow up from the caudex, bear heart-shaped leaves.[2]
Dioscorea mexicana ranges from the state of San Luis Potosí in northeastern Mexico south to Panama.[3][4][5][6][7][8][9] It is notable for its production of diosgenin, which is a precursor for the synthesis of hormones such as progesterone.[10]Russell Marker developed the extraction and manufacture of hormones from D. mexicana at Syntex. Later the Mexican barbasco trade focused instead on Dioscorea composita instead, as this variety has a higher diosgenin content.[11]
References[edit]
- ^ a b Kew World Checklist of Selected Plant Families
- ^ Dortort, Fred(2011). Succulent Plants of the World. Timber Press Inc. pp 220. ISBN 978-0-88192-995-9
- ^ Téllez V., O. & B. G. Schubert. 1994. 251. Dioscoreaceae. 6: 53–65. In G. Davidse, M. Sousa Sánchez & A.O. Chater (eds.) Flora Mesoamericana. Universidad Nacional Autónoma de México, México, D. F.
- ^ Sosa, V., B. G. Schubert & A. Gómez Pompa. 1987. Dioscoreaceae. Flora de Veracruz 53: 1–46.
- ^ Correa A., M.D., C. Galdames & M. Stapf. 2004. Catálogo de las Plantas Vasculares de Panamá 1–599. Smithsonian Tropical Research Institute, Panamá.
- ^ Pérez J., L. A., M. Sousa Sánchez, A. M. Hanan-Alipi, F. Chiang Cabrera & P. Tenorio L. 2005. Vegetación terrestre. 65–110. In J. Bueno, F Álvarez & S. Santiago Biodiversidad del Estado de Tabasco. CONABIO-UNAM, México.
- ^ Balick, M. J., M. H. Nee & D.E. Atha. 2000. Checklist of the vascular plants of Belize. Memoirs of The New York Botanical Garden 85: i–ix, 1–246.
- ^ Nelson Sutherland, C.H. (2008). Catálogo de las plantes vasculares de Honduras. Espermatofitas: 1-1576. SERNA/Guaymuras, Tegucigalpa, Honduras.
- ^ López Patiño, E.J., Szeszko, D.R., Rascala Pérez, J. & Beltrán Retis, A.S. (2012). The flora of the Tenacingo-Malinalco-Zumpahuacán protected natural area, state of Mexico, Mexico. Harvard Papers in Botany 17: 65-167.
- ^ ars-grin.gov
- ^ americanheritage.com
| License | http://creativecommons.org/licenses/by-sa/3.0/ |
| Rights holder/Author | Wikipedia |
| Source | http://en.wikipedia.org/w/index.php?title=Dioscorea_mexicana&oldid=622161174 |
D. mexicana, along with other mexican species, were the source of diosgenin, which was used to synthesize progesterone for the first synthetic birth control pills.
| License | http://creativecommons.org/licenses/by/3.0/ |
| Rights holder/Author | Amy Chang, Amy Chang |
| Source | No source database. |