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densiflora Sperling, are described, and four new combinations, A.
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Plants of the latter region superficially resemble Hedyotis angulata, and some of these were annotated as such by Terrell (e.g., Warnock 7978, from the Del Norte Mts [TEX]).
L., Sedum booleanum (Crassulaceae), a new red-flowered species from Nuevo Le6n, Mexico. L., Paronychia hintoniorum (Caryophyllaceae), a new species from Nuevo Leon and Veracruz, Mexico 38 TURNER, B. GREGORY, A new species of Ceratozaniia (Zamiaceae) from Oaxaca, Mexico with comments on distribution, habitat, and relationships 51 TURNER, B.
papillacea, at least two of these from the state of Rorida (Franklin Co., sand dunes and coastal areas along the Gulf of Mexico: Henderson 63-1309; Krai 39899).
nigricans examined by me in the present study, only a few sheets were discerned to have papillose enations of the type found in var.
papillacea these appear to be populationally "fixed" in the regions shown in Figure 1, occurring on plants with a habital display quite different from the habital display of var. ACKNOWLEDGMENTS 1 am grateful to my wife, Gaylc, lor the Latin diagnoses, and to her and Piero Delprete for reviewing the manuscript.
Obviously such enations are under relatively simple genetic control, but in the var. Abbreviations for authors follow Brummitt & Powell (1992). The species are taken up in the same sequence as they are in the dissertation. However, similar populational disjunctions occur in several species of Asteraceae (e.g., Chrysotlmmnus) and need not be cause for much concern, at least 1 find it difficult to distinguish between the two populational elements. Transfer of Texas species of Houstonia to Hedyotis (Rubiaceae).