Author: Donald Grunert HuttlestonPublisher:
ISBN:
Category :
Languages : en
Pages : 160
Book Description
A Taxonomic Study of the Genus Arisaema in North America
Author: Donald Grunert HuttlestonPublisher:
ISBN:
Category :
Languages : en
Pages : 160
Book Description
A Taxonomic Study of the Temperate North American Araceae
Author: Donald Grunert HuttlestonPublisher:
ISBN:
Category : Araceae
Languages : en
Pages : 432
Book Description
Taxonomic Studies on the Genus Atrichum in North America
Author: The Genus Arisaema
Author: Guy GusmanA taxonomic and nomenclatural study of the genus Amanita, section Amanita for North Amanita for North America
Author: David T. JenkinsThe Argasidae of North America, Central America and Cuba (Classic Reprint)
Author: Robert Allen CooleyPublisher: Forgotten Books
ISBN: 9781396002861
Category : Science
Languages : en
Pages : 162
Book Description
Excerpt from The Argasidae of North America, Central America and Cuba The taxonomic study of the Argasidae has been beset with difficult problems, some of which are still unsolved. The principal difficulty has been and still is the lack of adequate generic characters. Some of the earlier species were described from very few specimens and frequently with very little knowl edge Oi their biologies. By 1908, Neumann and Nuttall had notably improved the situation by better generic definitions and the use of new specific characters. Both retained as genera only Argas and Ornithodoros. In 1912 Banks added the genus Otobius, and in 1942 Antricola was added by the authors. In 1908 only some twenty species were known. Now in North America alone there are at least twenty-five species and about thirty new species have been described from other countries. The characters exhibited by these new species have served to clarify certain of the taxonomic problems; they have made others more confusing. Some specific distinctions have found corrobora tive support in the biologies. With the increasing number of new species, it has become more and more difficult to separate Arga; and Ornithodoros and we have found it necessary to change the previous conceptions of these genera. However, no genera have been synonymized. It is probable that subsequent workers will find Others necessary but it is earnestly hoped that none will be erected until reliable generic criteria have been clearly established. The present names serve the purpose and should be changed only for permanent reasons. In a previous paper1 the senior author emphasized the importance of variation within species. This occurs principally in the ornamentation, and the morphology is reasonably constant. In the Argasidae it is perhaps too early to evaluate fully the variation within species, but at least it is evident that it is of little importance in the genus Ornithodoros. Ornamentation is absent in the known species of the Argasidae except in Ornithodoros coriaceus. Where confusion has arisen in specific identities, it has been due largely to overlooking characters in the mammillae and hypostome, some Of which are not very easily detected, and the very distinct ones found in the larval stage which heretofore has not been thoroughly studied. 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.
A Taxonomic and Biological Study of the Genus Xyela Dalman in North America
Author: Donald J. BurdickPublisher:
ISBN: 9780520090781
Category :
Languages : en
Pages :
Book Description
Flora of North America
Author: Flora of North America Editorial CommitteePublisher: OUP USA
ISBN: 0195137299
Category : Science
Languages : en
Pages : 382
Book Description
Flora of North America, Volume 22, is the first of five volumes covering monocots in North America north of Mexico. The volume comprises many groups of acquatic plants and the North American relatives of groups that have their richest number of species in the New World tropics. Included among the treatments are the rush family (Junaceae), which include important indicator species in wetland habitats, the cat-tails (Typhaceae), spiderworts (Commelinaceae), aroids (Araceae), and pondweeds (Potamogetonaceae). Thirty families are included in this volume, representing a diverse range of plant forms - from marine Zosteraceae (eel-grasses) to stately Arecaceae (palms) and the naturalised exotic Zingiberaceae (gingers), Heliconiaceae (heliconias) and Musaceae (bananas).
A Taxonomic and Distributional Study of the Genus Amorpha in North Carolina
Author: Arturo Gonzalez-MasRhodora
Author: Benjamin Lincoln RobinsonPublisher:
ISBN:
Category : Botany
Languages : en
Pages : 564
Book Description