Am. J. Bot.
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(American Journal of Botany. 2001;88:1670-1674.)
© 2001 Botanical Society of America, Inc.

Systematics

Morphological interpretation of the spikelet in Digitaria atra (Poaceae: Panicoideae: Paniceae) and emended generic description1

Andrea S. Vega2 and Zulma Rúgolo de Agrasar2

Instituto de Botánica Darwinion, Labardén 200, C. C. 22, B1642HYD, Buenos Aires, Argentina

Digitaria atra is illustrated for the first time and the original description is emended. The diagnosis of the genus Digitaria is completed by introducing modifications related to the spikelet's morphology and the lower lemma's consistency. Some remarks about the lower palea are included. The unusual morphological characteristics of the spikelet of D. atra are compared with the tribe Isachneae and some genera of Paniceae.

Key Words: Digitaria atra • morphology • Paniceae • Panicoideae • Poaceae • taxonomy






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