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Canotia, a genus of holacanthoid shrubs of southwestern United States and northern Mexico, is redescribed, and reasons are advanced for retaining it in the family Celastraceae. Two species are recognized, includingC. wendtii sp. nov. from Chihuahua.
In the Apocynaceae the new combinationAlstonia pacifica (Seem.) A. C. Sm. is required. In the Asclepiadaceae the genusGymnema R. Br. is found not to occur in Fiji; for the two Fijian species previously referred to it the new combinationsLeichardtia stenophylla (A. Gray) A. C. Sm. andTylophora subnuda (A. Gray) A. C. Sm. are proposed. The species ofTylophora occurring in the Fijian Region are reviewed...
The genusMoonia of India and Ceylon, traditionally placed in the subtribe Melampodiinae, is shown to have closer affinities withDahlia andHidalgoa of the subtribe Coreopsidinae. Several morphologically heterogeneous taxa are excluded fromMoonia, and the remaining species,M. heterophylla, is described and illustrated.
The tetraploid and hexaploid cytotypes ofAchillea millefolium in western North America exhibit a complex distributional pattern involving overlapping ranges, mixed populations, and occasional pentaploid, septaploid, and octoploid plants. Cytogenetic and distributional evidence support the hypothesis that there has been a repeated autoploid origin of hexaploids from tetraploid progenitors. It is suggested...
Panicum amarum andP. amarulum exhibit north-south clinal variation and are virtually indistinguishable in the southern part of their range. Cytological evidence indicates thatP. amarum (2n = 54) is probably an autohexaploid derivative ofP. amarulum (2n = 36). The minor morphological differences, the apparent close genetic relationship, and the close ecological and chemical affinities between these...
Experimental hybridizations betweenTriodanis biflora (Ruiz & Pavon) Greene andT. perfoliata (L.) Nieuwland result in vigorous offspring in the F1 and F2 generations as well as in backcrosses. Field studies of natural populations indicate a gradient between the two taxa with many individuals resembling the experimental hybrids. A partial isolating mechanism due to cleistogamy inT. biflora enables...
In accord with its cytological and morphological distinctiveness and its geographical disjunction, the Sierran element ofC. pauciflora A. Gray is described as a new species,C. hooveri. Its chromosome number ofn = 7 is documented for the first time. Evidence from cytogenetic analysis of synthetic hybrids is presented to support the conclusion thatC. hooveri is more closely related toC. villosa DC....
In reviewing the Fijian Sapotaceae it was found necessary to describe three new species,Planchonella sessilis, Palaquium porphyreum, andBurckella parvifolia, and to propose one new combination,B. fijiensis (Chelonespermum fijiense Hemsl.).
Morphological and ecological studies of seven populations ofPyxidanthera barbulata Michx. in North and South Carolina indicate that the variation among populations is clinal and associated with differences in soil moisture retaining capacity and other environmental parameters. Breeding experiments show that the morphologically extreme populations are interfertile.Pyxidanthera brevifolia Wells (=P. barbulata...
Eragrostis scaligera Salzm. ex Steud., a native of northeastern Brazil, is redescribed and reported from Florida, the first record from North America. It has been mistaken forE. bahiensis Schrad. in Schult.,E. maypurensis (H.B.K.) Steud., andE. rufescens Schrad. in Schult., but is distinct in having axillary, intravaginal inflorescences in addition to terminal ones, and smooth, shining caryopses...
Chromosome numbers are reported for 48 collections representing ten species (and five subspecies) ofOrobanche of western North America. Two species of sect.Gymnocaulis have 2n = 48; previous counts are 2n = 36 and 72 for one of these species. In sect.Nothaphyllon eight species have 2n = 48 and three of these (O. cooperi, O. corymbosa, O. parishii) also have 2n = 96. One instance (2n = 72) of apparent...
The flora of Barro Colorado Island was examined for affinities with the floras of Central and South America. Trees, lianas, and epiphytes were treated as separate groups. Distributional classes were established, ranging from species endemic to Panama and those with distributions including both Central and South America as well as the West Indies. The Barro Colorado flora seems to consist of approximately...
A comparison of three heretofore undescribed species with the previously known species inTigridia subgen.Hydrotaenia suggests a realignment of taxa within the various complexes inHydrotaenia. Three species,T. venusta, T. illecebrosa, andT. catarinensis, and two subspecies,T. hallbergii ssp.lloydii andT. ehrenbergii ssp.flaviglandifera, are described.Sessilanthera citrina is described and the new taxonomic...
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