Excerpt from Phytologia, Vol. 74: An International Journal to Expedite Plant Systemic, Phytogeographical and Ecological Publication; January 1993
The generic treatment of North America Stipese is substantially modified. Seven genera are recognized, Achnatherum, Piptatherum, Oryzopsis, Ptilagrostis, Piptochaetium, Nassella, and Hesperostipa. Only Hesperostipa has not previously been recognized at the generic level. The characteristics of each genus are summarized and the 45 new combinations necessitated by this treatment presented. All species occurring in the continental U.S.A. and Canada are treated, plus a few of those occurring in northern Mexico. The largest genus, both globally and regionally, is Achnatherum. Hesperostipa comprises four species, H. comata, H. spartea, H. curtiseta, and H. neomexicana. The taxonomic changes at the specific level are 1) the description of a new species, A. perplexum, 2) modification of the limits of A. lobatum, A. occidentale, and A. coronatum, and 3) selection of a neotype for Stipa robusta (Vasey) Scribner.
Key Words: Gramineae, Stipeae, Taxonomy, Nomenclature, North America
The Stipeae is a cosmopolitan tribe comprising approximately 500 species. The limits of the tribe are now well accepted. Its members have floret per spikelet, with no rachilla extension, glumes that usually extend beyond the lemma apex, a well developed callus, a lemma that is usually stiff or hard, and a terminal, usually articulated awn.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works. Это и многое другое вы найдете в книге Phytologia, Vol. 74