Taxonomic and geographic notes on the neotropical Commelina (Commelinaceae)
2018
Hassemer, Gustavo
I present here taxonomic and geographic notes to advance the taxonomic and geographic knowledge of the neotropical Commelina (Commelinaceae). More specifically, I re-establish C. dielsii, a yellow-flowered species only known from the type collected in north-eastern Argentina, which is morphologically allied to C. erecta and C. catharinensis; I lectotypify and re-establish C. longicaulis, and I present evidence that this is the correct name for the species currently being called C. schomburgkiana; I lectotypify C. pallida and C. scabra; and I also lectotypify the names C. gracilis and C. prostrata (synonyms of C. diffusa), C. angustifolia, C. bahiensis, C. caripensis, C. crispa, C. elegans, C. roseo-purpurea and C. sulcata (synonyms of C. erecta), and C. acuminata Kunth, C. cayennensis var. pubescens, C. coelestis, C. fasciculata, C. graminifolia and C. scapigera (synonyms of C. tuberosa). In total, 18 names are here lectotypified, and eight synonymisations are newly proposed. Furthermore, I also present the first records of C. tuberosa in Chile, which are also the first records of the occurrence of a native Commelina species in this country. Finally, I provide an identification key to the 11 species of Commelina that occur in Argentina, Brazil, Chile, Guyana, Paraguay, Suriname and Uruguay.
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