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Type: Article
Published: 2018-09-06
Page range: 275–283
Abstract views: 26
PDF downloaded: 1

A new and unusual endemic species from the Chihuahuan Desert, Mexico: Antiphytum geoffreyi (Boraginaceae, Echiochiloideae)

Posgrado en Ciencias Biológicas, Instituto de Biología. Universidad Nacional Autónoma de México. 3er. Circuito Exterior s/n, Coyoacán, 04510, Ciudad de México, México. 2 Departamento de Botánica, Instituto de Biología, Universidad Nacional Autónoma de México, Ap. Postal 70-233, Coyoacán, 04510, Ciudad de México, México.
Universidad Nacional Autónoma de México
Department of Biology, San Diego State University, San Diego, California 92182, U. S. A.
Biology Department, Oberlin College, Oberlin, Ohio 44074, U. S. A.
endangered species fruit gynobase North America Eudicots

Abstract

A new and unusual species of Antiphytum, here named A. geoffreyi, is described and illustrated. This new species is assigned to the genus Antiphytum because it possesses eremocarps directly attached to a pyramidal gynobase, which forms a ventral cicatrix on the eremocarp. However, it is unique within Antiphytum in having multiple inflorescence branches arising nearly at the base of the plant, a triangular-pyramidal gynobase, and the proportionally longest eremocarp cicatrix of the genus. Some of these characteristics are reminiscent of Ogastemma, the sister genus of Antiphytum, making A. geoffreyi of potential great significance in the systematics of Boraginaceae subfam. Echiochiloideae. Among species of Antiphytum, A. geoffreyi is most similar to A. peninsulare, with which it shares a triangular-shaped eremocarp, but it differs from this species in possessing an infra-medial cicatrix and a smaller corolla limb diameter. The new species is known from only two collections in Coahuila, Mexico, both made by the Hinton family, who have discovered many new species in their extensive explorations of the country and provided important specimens to the country’s flora.