REEVALUATION OF AYLACOPHORA AND PALEAEPAPPUS (ASTERACEAE: ASTEREAE)

Nardophyllum deserticola (Cabrera) Nesom and Nardophyllum patagonicum (Cabrera) Nesom are two endemic species from Argentinean Patagonia that were originally described under the monotypic genera Aylacophora and Paleaepappus in 1953 and 1969, respectively. In 1993, Nesom included Aylacophora and Pale...

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Bibliographic Details
Published in:SIDA, contributions to botany contributions to botany, 2001-08, Vol.19 (3), p.531-538
Main Authors: Bonifacino, José M., Sancho, Gisela
Format: Article
Language:English
Subjects:
Conservation biology
Florets
Genera
Inflorescences
Pampas
Shrubs
Online Access:Get full text
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Summary:Nardophyllum deserticola (Cabrera) Nesom and Nardophyllum patagonicum (Cabrera) Nesom are two endemic species from Argentinean Patagonia that were originally described under the monotypic genera Aylacophora and Paleaepappus in 1953 and 1969, respectively. In 1993, Nesom included Aylacophora and Paleaepappus within the genus Nardophyllum, arguing that the discontinuities between the paleaceous pappus of Aylacophora and Paleaepappus and the pappus bristles of Nardophyllum do not justify considering them as distinct genera. Careful observation of the herbarium material revealed that: 1) the pappus of N. deserticola and N. patagonicum consists of ca. 10 linear-elliptic paleae, while in remaining Nardophyllum species, the pappus is composed of ca. 30 bristles, and 2) the receptacular paleae of Nardophyllum deserticola and Nardophyllum patagonicum are wide and enclose the florets, while in Nardophyllum species, the paleae, if present, are narrow and do not enclose the florets. These observed discontinuities between N. deserticola and N. patagonicum with respect to the rest of Nardophyllum do support the consideration of both species as to two distinct monotypic genera, Aylacophora and Paleaepappus, respectively. Nardophyllum deserticola (Cabrera) Nesom y Nardophyllum patagonicum (Cabrera) Nesom son dos especies endémicas de la Patagonia argentina que fueron originalmente descritas bajo los géneros monotípicos Aylacophora y Paleaepappus en 1953 y 1969, respectivamente. Posteriormente en 1993, Nesom incluyó Aylacophora y Paleaepappus dentro del género Nardophyllum argumentando que las discontinuidades entre el papo paláceo de Aylacophora y Paleaepappus y el papo piloso de Nardophyllum no justifican considerar a éstos como géneros independientes. La observación detallada del material de herbario reveló que: 1) el papo de N. deserticola y N. patagonicum consiste en ca. de 10 páleas linear-elípticas, mientras que en el resto de las especies de Nardophyllum, el papo está compuesto por ca. 30 cerdas y 2) las páleas del receptáculo de Nardophyllum deserticola y Nardophyllum patagonicum son anchas y abrazan las flores, mientras que en el resto de las especies de Nardophyllum, las páleas, si están presentes, son más angostas y no abrazan las flores. Las discontinuidades observadas entre N. deserticola y N. patagonicum con el resto de Nardophyllum apoyan la consideración de ambas especies como dos géneros monotípicos independientes, Aylacophora y Paleaepappus, respectivame
ISSN:0036-1488
2334-3273