New species and a new lectotypifications in Forsteronia (Apocynaceae, Mesechiteae)
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Four new species of Forsteronia are described and illustrated, a distribution map and a key for the species of Forsteronia in Brazil provided, and Forsteronia myriantha lectotypified. Forsteronia manausana resembles F. brevifolia, but differs by its glabrous filaments and smaller leaves. Forstersonia nitida shows affinity to F. tarapotensis but is distinguished by the combination of subcoriaceous, elliptic leaves, large-bracted inflorescences, and somewhat larger flowers.Forsteronia paraensis is apparently most closely related to F. laurifolia but can be separated by its larger and more heavily veined leaves, longer and more floriferous inflorescences, and pubescent ovaries. Forsteronia prancei is morphologically similar to F. manausana, from which it is distinguished by the larger and more coriaceous leaves, denser and more hemispheric inflorescence, and larger flowers.
KeywordsAmazonas Apocynoids Brazil Neotropics Suriname
We thank the curators of the following herbaria for allowing the study of their collections: A, B, BM, CEPEC, CGE, CR, F, G, GH, HAL, INPA, JAR, K, MBML, MO, NY, P, RB, S, SPF, U, UC, UNIP, US, USF, W, WAG. The second author thanks the University of Bayreuth (Germany), the Deutscher Akademischer Austauschdienst (Germany) (PKZ, A/12/97412), and the Missouri Botanical Garden (United States) for providing financial support. We thank the staff of the National Herbarium of Costa Rica (CR) for allowing us to use their facilities and Mary Endress (Z) and Sigrid Liede-Schumann (UBT) for their helpful reviews. This study forms part of the doctoral dissertation of the second author, which was never published.
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