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This paper updates the orchid flora of the Bahama Archipelago since the publication of theFlora of the Bahama Archipelago. It includes the descriptions of two natural hybrids,Encyclia × lleidae andEncyclia × raganii, heretofore unknown. In addition, this paper reports the distributional extensions of seven orchid taxa.
Begonia xilitlensis, a new species inBegonia sectionGireoudia from Mexico is described, illustrated, and discussed, and the taxonomic and nomenclatural status of two others,Begonia glandulosa andB. stigmosa, is evaluated with a lectotype chosen for the former.
Piptadenia (sect.Pityrocarpa)leucoxylon is described from the lower Orinoco basin in Venezuela, andPithecellobium (sect.Samanea)foederale from Distrito Federal, Brazil. Figures, diagnoses, and discussion of kinship are presented for each.
Mikania macrostipulata sp. nov. is described, illustrated, and discussed.Mikania dioscoreoides, M. sprucei, andM. trifolia are reported new to Peru. The heterogeneity of the type material ofM. stereodes is also discussed.
Potentilla basaltica Tiehm & Ertter is described, illustrated and compared to other members of theMultijugae group,P. newberryi, andIvesia. The leaf form and small flowers are reminiscent ofIvesia, indicating a possible new link between the two genera.
The importance of a cladistic approach in reconstructing the phylogeny of bryophytes is discussed and illustrated by an analysis of the major groups of bryophytes with respect to the tracheophytes and the green algae. The cladistic analysis, using 51 characters taken from the literature, gives the following tentative results: (1) the embryophytes as a whole are monophyletic; (2) the bryophytes (sensu...
Bohumil Francis Kukachka is remembered for his anatomical studies of the Sapotaceae. He received his Ph.D. from the University of Minnesota in 1942 in wood technology, and in 1945 his 37-year career began at the U.S. Forest Products Laboratory in Madison, Wisconsin. Seventy-four of his publications from 1944 to 1982 are listed.
Three distinct types of stigma architecture, designated as “simple-erect,” “conduplicate-spiral”, and “convolute-blade” were identified for Bromeliaceae. Structure of the conduplicate-spiral and convolute-blade stigma types is highly complex and previously unreported. Stigma morphology, largely neglected in Tillandsioideae until recently, promises to yield new characters valuable in interpreting systematic...
Helietta lottiae, a new species from tropical deciduous forest from Guerrero and Jalisco, Mexico, is described. A key to the North American species of the genus and their geographical distribution are presented.
Prior to this study thirteen taxa ofSisyrinchium sectionBermudiana were recognized as occurring in the Rocky Mountains. Morphological intrapopulational variation and hybridization with polyploidy has led to a general lack of discrete phenetic discontinuities among the species, resulting in differing taxonomic treatments. A biosystematic study utilizing morphology, cytology, analysis of breeding systems,...
Enzyme electrophoresis was employed to examine genetic variation within and among the three diploid (n=12) species comprisingCoreopsis sectionCalliopsis: C. leavenworthii, C. paludosa andC. tinctoria. Twelve enzymes specified by 20 genes were included, and those isozymes localized in the plastids were identified for several of the enzymes. Mean genetic identities calculated for pair-wise comparisons...
Plants ofAster sandwicensis (A. Gray in H. Mann) Hieron. belong inA. subulatus Michaux but are recognized as taxonomically distinct from those of var.subulatus. A new combination is needed:A. subulatus var.sandwicensis (A. Gray in H. Mann) A. G. Jones, comb. nov.Chamisso s.n. (G-DC!) is chosen as the lectotype.
The morphology of the Purpureae Group of North AmericanAristida is assessed by principal components and statistical analyses. Long considered a complex of about eight species, a mosaic of intergrading phenetic forms is revealed and the complex is reduced to one species with seven varieties. The taxa that are recognized areAristida purpurea var.purpurea, var.nealleyi (comb. nov.), var.curvifolia (comb...
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