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(American Journal of Botany. 2005;92:634-641.)
© 2005 Botanical Society of America, Inc.

Systematics and Phytogeography

Extinction threat in the Pedilanthus clade (Euphorbia, Euphorbiaceae), with special reference to the recently rediscovered E. conzattii (P. pulchellus)1

Mark E. Olson2,5, José A. Lomelí S3 and N. Ivalú Cacho2,4

2Instituto de Biología, Universidad Nacional Autónoma de México, Departamento de Botánica, Tercer Circuito s/n, Ciudad Universitaria, Copilco, Coyoacán A.P. 70-367, México, Distrito Federal, C.P. 04510, Mexico; 3Jardín Botánico y Herbario, Facultad de Ciencias Químicas y Biológicas, Universidad Autónoma de Guadalajara, Av. Patria 1201, Apdo. Postal 1-440, 44100 Guadalajara, Jalisco, Mexico

ABSTRACT

The type locality of the slipper spurge Euphorbia conzattii has been in doubt because the 1917 type is a mixed collection with vague label data. In recent field work, the species was found on Cerro Espino, Pochutla District, Oaxaca, Mexico. We used the Method for Evaluation of Risk of Extinction for Mexican Wild Species (MER), required to protect a species under Mexican law, to assess the conservation status of E. conzattii and found it to be endangered. We discuss the mixture in the type of this species with E. calcarata and present an updated description and an illustration of E. conzattii. Preliminary MER assessments of the other Mexican Pedilanthus clade species show two species to be extinct (E. cyri, E. dressleri) and four threatened (including E. colligata, E. finkii, E. tehuacana). The remaining eight have more favorable outlooks. We comment on MER robustness and aspects vulnerable to confusion and offer clarifications. Extinction risk is not distributed evenly throughout the clade, with a subclade of leafy treelets from a variety of habitats having the greatest number of endangered species. Extinction risk is distributed across all Pedilanthus-clade habitats; the strongest association noted is that both species from moist highlands are endangered.

Key Words: Cerro Espino • Euphorbiaceae • Euphorbia • extinction • Oaxaca • Pedilanthus • threatened plants






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