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New Taxa and a New Combination in Tidestromia (Amaranthaceae) from North America

2002; Missouri Botanical Garden Press; Volume: 12; Issue: 3 Linguagem: Inglês

10.2307/3393088

ISSN

1945-6174

Autores

Ivonne Sánchez‐del Pino, Hilda Flores‐Olvera, Ivonne Sánchez‐del Pino,

Tópico(s)

Plant Taxonomy and Phylogenetics

Resumo

A new species and a new subspecies of Tidestromia are described and illustrated. Tidestromia valdesiana, restricted to Coahuila, Mexico, is characterized by the absence of an involucre and tepals lanceolate, aristate at the apex with a prominent midnerve and subulate trichomes. Tidestromia lanuginosa subsp. eliassoniana is characterized by having trichomes with the terminal cell projections either irregular (as those of the subsp. lanuginosa) or spreading, and microspinulose pollen, which is unique within the genus. A distribution map for the two recognized subspecies of T lanuginosa is provided. The new combination T suffruticosa var. oblongifolia is proposed, and T oblongifolia subsp. cryptantha is reduced to synonymy under the former; both names are lectotypified. RESUMEN. Se describen e ilustran una especie y una subespecie nuevas de Tidestromia. Tidestromia valdesiana, end6mica de Coahuila, MWxico, se caracteriza por los tepalos lanceolados de apice aristado con la vena media prominente y tricomas subulados, as( como por no tener involucro. Tidestromia lanuginosa subsp. eliassoniana se caracteriza por tener tricomas con proyecciones de las celulas terminales irregulares (como en la subsp. lanuginosa) o patentes, asi como polen microespinuloso que es iinico en el genero. Se incluye un mapa de distribuci6n de las dos subespecies reconocidas de T lanuginosa. Ademais se propone la combinaci6n nueva T suffruticosa var. oblongifolia, reduci6ndose como sin6nimo T oblongifolia subsp. cryptantha; ambos nombres son lectotipificados.

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