Rediscovery and notes on Brachystelma maculatum (Apocynaceae)
نویسندگان
چکیده
منابع مشابه
Notes on Types in Apocynaceae: Asclepiadoideae in Cuban Herbaria and Four Lectotypifications in West Indian Gonolobinae
Four asclepiadaceous types not listed in a previous type catalogue of the collections of the Instituto de Ecología y Sistemática, Habana, Cuba (HAC) are provided, along with a discussion of typification problems associated with the associated Charles Wright collections. Lectotypifications are provided for Gonolobus stephanotrichus Griseb., Orthosia acuminata Griseb., Orthosia oblongata Griseb.,...
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As a component of a larger study of the West Indian Matelea subgenus Ptycanthera, this study sought to critically examine patterns of morphological variation within the embedded M. bayatensiscorrellii-tigrina complex. Resolution of species-level circumscriptions are necessary before larger issues of subgeneric and generic circumscription can be adequately addressed. Morphological characters wer...
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متن کاملon semihypergroups and hypergroups
in this thesis, first the notion of weak mutual associativity (w.m.a.) and the necessary and sufficient condition for a $(l,gamma)$-associated hypersemigroup $(h, ast)$ derived from some family of $lesssim$-preordered semigroups to be a hypergroup, are given. second, by proving the fact that the concrete categories, semihypergroups and hypergroups have not free objects we will introduce t...
15 صفحه اولOn the rediscovery of a distinction.
In 1980, Morgenstern et al. (1) described in detail how in epidemiology two different measures of disease incidence are used: risk and rate. For background, the authors cited mainly recent epidemiologic publications from the United States. It is the purpose of this commentary to propose that the roots of the distinction between risk and rate stem from an earlier period; the renewed description ...
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ژورنال
عنوان ژورنال: Rheedea
سال: 2018
ISSN: 0971-2313,0971-2313
DOI: 10.22244/rheedea.2018.28.2.14