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8 April 2014 A New Species of Cybianthus (Myrsinaceae) from Tobago and Venezuela
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Abstract

Cybianthus pittierianus Pipoly & Ricketson (Myrsinaceae) is described from Tobago, and its taxonomic relationships are discussed. This species is often confused with C. rostratus (Hassk.) G. Agostini owing to its free portions of the filaments being longer than the anthers, and leaves with similar elliptic shapes and with petioles less than 1.2 cm. However, C. pittierianus is easily distinguished from C. rostratus by the former's leaf blade apices abruptly acute to short-acuminate (vs. long-acuminate to caudate), with secondary veins in 18 to 24 pairs (vs. 28 to 32 pairs), corollas 2.4–3 mm (vs. 2.1–2.5 mm), and corolla lobes chartaceous (vs. carnose) and adaxially glabrous (vs. densely glandular-granulose). Cybianthus pittierianus is known from the Coastal Cordillera of Venezuela and Tobago, in cloud forests on potassium- and magnesium-rich but nitrogen- and organically poor soils over metamorphic gneiss or schist rocks.

Se describe Cybianthus pittierianus Pipoly & Ricketson (Myrsinaceae) como especie nueva para la ciencia y se discute su parentesco. Esta especie ha sido confundido con C. rostratus (Hassk.) G. Agostini debido a que las porciones apicales libres de sus filamentos son mas largas que las anteras, sus láminas elípticas con pecíolos menos que 1.2 cm de largo. Sin embargo, C. pittierianus se distingue fácilmente de C. rostratus por sus ápices foliares abrupte agudos hasta corto- acuminados (no largo-, ni caudados), nervios secundarios 18 a 24 (no 28 a 32) pares, corola 2.5–3 (no 2.1–2.5) mm de largo, con lóbulos corolinos cartáceos (no carnosos), y completamente glabros por dentro (sin gránulos glandulares). Cybianthus pittierianus se encuentra en la Cordillera de la costeña de Venezuela y en Tobago, en bosques nublados con suelos muy pobres en nitrógeno y elementos orgánicos; pero ricos en potásio y magnesio sobre rocas metamórficas de gneis o esquisto.

John J. Pipoly "A New Species of Cybianthus (Myrsinaceae) from Tobago and Venezuela," Novon: A Journal for Botanical Nomenclature 23(1), 75-78, (8 April 2014). https://doi.org/10.3417/2012080
Published: 8 April 2014
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