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Phytologia, Vol. 45 (Classic Reprint)

Henry A. Gleason

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Description:Excerpt from Phytologia, Vol. 45 In 1809 Robert Brown separated a group of genera from the Apocyneae (= Apocynaceae) on the basis that they differed from the remainder of the family in possessing free styles, a gynostegium (i.e. the fusion product of masses and the more or less common presence of an extra whorl of corona attached in various forms to the petals. He named this group the Asclepiadeae. Apart from these differences, the Apocyneae sensu stricto and the then newly emerging Asclepiadeae shared a multitude of tributes, viz. the regular, pentamentous, tetracyclic, and hypogynous flowers, the almost universal presence of latex and the contorted imbrication of petals. Eversince, the Asclepiadeae grew in size to accomodate new genera and species, and their name was subsequently changed by Lindley (1853) to Asclepiadaceae R.Br. The Asclepiadaceae were first classified by Decaisne (1844) into 5 tribes (Periploceae, Secomoneae, Asclepiadeae, Gonolobeae and Stapelieae) on the basis of pollen structure, with the first tribe having pollen in tetrads while all other 4 tribes are characterized by pollen masses or pollinia. The mechanism of pollen discharge differs also in the Periploceae (where the tetrads are received and dispersed by spathulate translators) than in the rest of the family (where pollinia are attached to grandular secretions known as corpuscles from the 5 corners of the pentagonal stigma via non-cellular cords known as the caudicles or connectors). Decaisne's classification was later accepted in its entirity by subsequent taxonomists (e.g. Lindley 1853). However, the subdivision of Asclepiadaceae ensu Decaisne has undergone a number of alternations involving primarily the hierarchical status of each of the 5 tribes. 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.We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Phytologia, Vol. 45 (Classic Reprint). To get started finding Phytologia, Vol. 45 (Classic Reprint), you are right to find our website which has a comprehensive collection of manuals listed.
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Description: Excerpt from Phytologia, Vol. 45 In 1809 Robert Brown separated a group of genera from the Apocyneae (= Apocynaceae) on the basis that they differed from the remainder of the family in possessing free styles, a gynostegium (i.e. the fusion product of masses and the more or less common presence of an extra whorl of corona attached in various forms to the petals. He named this group the Asclepiadeae. Apart from these differences, the Apocyneae sensu stricto and the then newly emerging Asclepiadeae shared a multitude of tributes, viz. the regular, pentamentous, tetracyclic, and hypogynous flowers, the almost universal presence of latex and the contorted imbrication of petals. Eversince, the Asclepiadeae grew in size to accomodate new genera and species, and their name was subsequently changed by Lindley (1853) to Asclepiadaceae R.Br. The Asclepiadaceae were first classified by Decaisne (1844) into 5 tribes (Periploceae, Secomoneae, Asclepiadeae, Gonolobeae and Stapelieae) on the basis of pollen structure, with the first tribe having pollen in tetrads while all other 4 tribes are characterized by pollen masses or pollinia. The mechanism of pollen discharge differs also in the Periploceae (where the tetrads are received and dispersed by spathulate translators) than in the rest of the family (where pollinia are attached to grandular secretions known as corpuscles from the 5 corners of the pentagonal stigma via non-cellular cords known as the caudicles or connectors). Decaisne's classification was later accepted in its entirity by subsequent taxonomists (e.g. Lindley 1853). However, the subdivision of Asclepiadaceae ensu Decaisne has undergone a number of alternations involving primarily the hierarchical status of each of the 5 tribes. 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.We have made it easy for you to find a PDF Ebooks without any digging. And by having access to our ebooks online or by storing it on your computer, you have convenient answers with Phytologia, Vol. 45 (Classic Reprint). To get started finding Phytologia, Vol. 45 (Classic Reprint), you are right to find our website which has a comprehensive collection of manuals listed.
Our library is the biggest of these that have literally hundreds of thousands of different products represented.

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Phytologia, Vol. 45 (Classic Reprint)

Phytologia, Vol. 45 (Classic Reprint)

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