01901naa a2200193 a 450000100080000000500110000800800410001910000160006024500700007626000090014652013900015565000140154565000110155965300090157065300170157965300120159665300100160877300890161817890311996-06-03       1982    bl ---       0--  u    #d1 aHILL, S. R.  aA monograph of the genus Malvastrum A. Gray (MalvaceaebMalveae).  c1982  aMalvastrum, a genus of yellow-flowered annual or perennial tropical and subtropical herbs in the Malvaceae, was described by Asa Gray in 1849 to include members of Sida and Malva that did not quite fit into those genera. During the next century the rather ill-defined genus became a repository for over 300 names. Subsequent monographic work brought about refinements in its circumscription that resulted in generic segregates and a core of so-called "true" Malvastrums. After morphological, karyological, phenological, and numerical analyses, the present study accepts seven sections, 14 species, six subspecies, and two varieties in Malvastrum. The following contributions have been made: 1) the citation of all of the names published in Malvastrum together with their present placement and disposition of types; 2) an analysis of the geographic distribution of Malvastrum together with an hypothetical account of the origin and subsequent dispersal of the species; 3) a comparison of the morphology, chromosome numbers, limited hybridization data, and floral behavior within Malvastrum resulting in a proposal of infra- and inter-generic relationships; 4) the inclusion of a revised generic description and diagnostic key to the taxa; and 5) the inclusion of a detailed description, synonymy, and illustration for each taxon, several of which have never previously been illustrated.  aMalvaceae  aPlanta  aGray  aMalvastrum A  aMalveae  aPlant  tRhodora - Journal of the New England Botanical Clubgv.84, n.837, p.1-83, Jan. 1982.