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NH (1980). Pollen morphology of the tribe Neottieae and its impact on the classification of the Orchidaceae. Grana, 19, 7-18.

Genera Orchidacearum: Volume 1: Apostasioideae and Cypripedioideae - Pagina 194
a cura di - 1999 - 197 pagine
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Phylogeny and Classification of the Orchid Family

Robert L. Dressler - 1993 - 342 pagine

...limitations to fruit production in a tropical orchid. Ecology 71:263-272. Ackerman, JD, and NH Williams. 1980. Pollen morphology of the tribe Neottieae and...impact on the classification of the Orchidaceae. Grana 19:7-18. 1981. Pollen morphology of the Chloraeinae (Orchidaceae: Diurideae) and related subtribes....

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