Dermatophyllum

Dermatophyllum
Dermatophyllum secundiflorum
Scientific classification
Kingdom:	Plantae
(unranked):	Angiosperms
(unranked):	Eudicots
(unranked):	Rosids
Order:	Fabales
Family:	Fabaceae
Subfamily:	Faboideae
(unranked):	Genistoids[1]
Genus:	Dermatophyllum Scheele 1848
Species
6; see text.
Synonyms[2]
Agastianis Raf. Broussonetia Ortega Calia Terán Berland. Sophora sect. Arizoniatae Tsoong Sophora sect. Agastianis (Raf.) Tsoong Sophora sect. Calia (Terán & Berland.) Rudd

Dermatophyllum is a genus of three or four species of shrubs and small trees in the subfamily Faboideae of the pea family, Fabaceae. The genus is native to southwestern North America from western Texas to New Mexico and Arizona in the United States, and south through Chihuahua, Coahuila and Nuevo León in northern Mexico. Members of the genus are commonly known as mescalbean, mescal bean or frijolito. One of the common names of Dermatophyllum secundiflorum is Texas mountain laurel, although the name mountain laurel also refers to the very dissimilar and unrelated genus Kalmia (family Ericaceae) and the name laurel refers generally to plants in the unrelated order Laurales.

Although still commonly treated in the genus Sophora, recent genetic evidence has shown that the mescalbeans are only distantly related to the other species of Sophora.^[3]

Species

Dermatophyllum comprises the following species:^[2][4][5]

• Dermatophyllum arizonicum (S.Watson) Vincent—Arizona Mescalbean (Arizona, Chihuahua)
  • subsp. arizonicum (S.Watson) Vincent
  • subsp. formosum (Kearney & Peebles) Vincent (Arizona)
• Dermatophyllum gypsophilum (B.L. Turner & A.M. Powell) Vincent—Guadalupe Mescalbean (Southern New Mexico, western Texas, Coahuila)
• Dermatophyllum guadalupense (B.L. Turner & A.M. Powell) B.L.Turner
• Dermatophyllum juanhintonianum (B.L. Turner) B.L. Turner
• Dermatophyllum secundiflorum (Ortega) Gandhi & Reveal—Texas Mescalbean (Texas, New Mexico, Coahuila, Nuevo León)
• Dermatophyllum purpusii (Brandegee) Vincent

Description

Seedpods

Dermatophyllum spp. grow to 1–11 m (3.3–36.1 ft) tall, with a trunk up to 20 cm (7.9 in) in diameter, often growing in dense thickets that grow from basal shoots. The leaves are evergreen, leathery, 6–15 cm (2.4–5.9 in) long, pinnate with 5-11 oval leaflets, 2–5 centimetres (0.79–1.97 in) long and 1–3 cm (0.39–1.18 in) broad. The flowers, produced in spring, are fragrant, purple, typical pea-flower in shape, borne in erect or spreading racemes 4–10 cm (1.6–3.9 in) long. The fruit is a hard, woody seedpod 2–15 cm (0.79–5.91 in) long, containing 1-6 oval bright red seeds 1–1.5 cm (0.39–0.59 in) long and 1 cm (0.39 in) in diameter.

All parts of the mescalbeans are very poisonous, containing the alkaloid cytisine (not mescaline, as suggested by the name). The seeds or other parts of the plant have been reported to have been used as a hallucinogen by some Native American people, but this is uncertain, due to confusion over names. The symptoms of cytisine poisoning are very unpleasant, including nausea and seizures; as little as one seed can be fatal.

References

1. Cardoso D, Pennington RT, de Queiroz LP, Boatwright JS, Van Wyk B-E, Wojciechowski MF, Lavin M. (2013). "Reconstructing the deep-branching relationships of the papilionoid legumes". S Afr J Bot 89: 58–75. doi:10.1016/j.sajb.2013.05.001.
2. Gandhi KN, Vincent MA, Reveal JL. (2011). "Dermatophyllum, the correct name for Calia (Fabaceae)" (PDF). Phytoneuron 2011 (57): 1–4. ISSN 2153-733X.
3. Heenan PB, Dawson MI, Wagstaff SJ. (2004). "The relationship of Sophora sect. Edwardsia (Fabaceae) to Sophora tomentosa, the type species of the genus Sophora, observed from DNA sequence data and morphological characters". Bot J Linn Soc 146 (4): 439–446. doi:10.1111/j.1095-8339.2004.00348.x.
4. Turner BL. (2012). "New names in Dermatophyllum (Fabaceae)" (PDF). Phytoneuron 2012 (3): 1–4. ISSN 2153-733X.
5. "The Plant List entry for Dermatophyllum". The Plant List. Royal Botanic Gardens, Kew and the Missouri Botanical Garden. 2013. Retrieved 19 May 2014.