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Phytologia (March 1990) 68(3):202-204. A NEW SPECIES OF LAENNECIA (ASTERACEAE: ASTEREAE) FROM CHIHUAHUA, MEXICO Guy L. Nesom' k. Joseph E. Laferriere'^ 'Department of Botany, University of Texas, Austin, Texas 78713 U.S.A. and ■^Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, Arizona 85721 U.S.A. ABSTRACT A new species, Laennecia pimana Nesom & Laferriere, is de-scribed. It apparently is narrowly endemic to the Sierra Madre Occi-dental of west central Chihuahua, Mexico, and is most closely related to two other endemics of the same region, Erigeron {Laennecia) eriophyl-lus A. Gray and an as yet undescribed species of Laennecia. Laennecia pimana differs from these species by its eligulate pistillate corollas. RESUMEN Una nueva especie, Laennecia pimana Nesom & Laferriere, se describe. Posee un distribucion muy restringida en la Sierra Madre Occidental del oeste de Chihuahua, Mexico, y esta mas emparentada con otras especies endemicas de la misma region, Erigeron {Laennecia) eriophyllus A. Gray y una otra nueva especie de Laennecia. Laennecia pimana se diferencia de las anteriores por las corolas pistiladas eligu-ladas. KEYWORDS: Laennecia, Erigeron, Conyza^ Astereae, Asteraceae, Mexico, Chihuahua. Intensive collecting by the second author in west central Chihuahua has brought to light a previously undescribed species of Laennecia. The new species proposed here joins Erigeron eriophyllus A. Gray, which occurs from southern Arizona to eastern Chihuahua, and an undescribed species (a nar-row endemic from west central Chihuahua), to form a trio of related species restricted in distribution primarily to northwestern Mexico. Transfer of E. eriophyllus to Laennecia, description of the other new species, and the tax-onomy of Laennecia, along with the rationale for considering it as a genus separate from Conyza are presented in a separate paper (Nesom 1990). 202

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A new species of Laennecia (Asteraceae: Astereae) from Chihuahua, México

J E Laferriére and G L Nesom
Phytologia 68: 202-204 (1990)

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