Volume 43 – Issue 1 (Mar 1978)

The Rarity of Leavenworthia uniflora, with Special Reference to Its Occurrence in Kentucky

ABSTRACT <em>Leavenworthia uniflora</em> (Michx.) Britton (Cruciferae) has the widest geographical range of any of the 11 taxa in the genus, and it is the only one that is not considered threatened or endangered. In southeastern United States, <em>L. uniflora</em> is restricted to cedar glades and other limestone barrens. Populations are infrequent, small in size, and in number of individuals. In Kentucky the species has been collected in seven counties, but some of the collections are very old. Extant populations presently are known to occur on cedar glades in Logan, Simpson and Warren Cos. The geographical distribution pattern qualifies <em>L. uniflora</em> as a rare species in Kentucky, and probably throughout its range. We propose that <em>L. uniflora</em> be added to the list of rare and endangered vascular plant species in those southeastern states in which it occurs.

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The Vascular Flora of “The Hammock,” Dunedin, Florida

ABSTRACT A floristic survey of “The Hammock,” Florida’s first State Natural Feature to be recognized under a new program for preserving typical examples of the State’s original land forms, is presented. A description of the major plant communities, an annotated list of species, and a brief historical account is given. Three hundred and thirty-six species from 100 families are reported.

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Taxonomic Notes on Houstonia purpurea var. montana (Rubiaceae)

ABSTRACT <em>Houstonia purpurea</em> var. <em>montana</em> is restricted to the summits of Roan Mountain, North Carolina-Tennessee, and Grandfather Mountain, North Carolina. Morphological and cytogenetic data support varietal rank for it instead of specific rank as <em>H. montana</em>. Correct authorships for these names are discussed. A recent finding of sterility in crosses between <em>H. purpurea</em> var. <em>purpurea</em> and var. <em>montana</em> could have been caused by ploidy differences alone rather than by more fundamental differences. <em>Houstonia purpurea</em> var. <em>montana</em> is subjected to increasing human encroachment and should be considered as threatened or endangered.

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