Abstract
A taxonomic revision of two of the four genera in the rutaceous subtribe Pteleinae is presented.Helietta andBalfourodendron are neotropical taxa that share trifoliolate leaves, terminal thyrses, small isostemonous flowers, syncarpous 4–5-carpellate ovaries, winged fruits, and seeds with endosperm. They differ mainly in thatBalfourodendron has leaf domatia and a samara with broad verticillate wings, whileHelietta lacks domatia and has a fruit that separates into free samaroid mericarps, each with a dorsal wing. Two species are recognized inBalfourodendron, B. riedelianum andB. molle, the latter being a new combination.Helietta comprises 8 species, including a new combination,H. glaziovii. Keys to the species, descriptions, synonyms illustrations, and comments on the geographic distribution and ecology of each taxon are presented.
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Pirani, J.R. A revision of Helietta and Balfourodendron (Rutaceae-Pteleinae). Brittonia 50, 348–380 (1998). https://doi.org/10.2307/2807779
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DOI: https://doi.org/10.2307/2807779