Unonopsis rigida R.E.Fr.
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Authority
Maguire, Bassett & Wurdack, John J. 1957. The Botany of the Guiana Highland -- Part II. Mem. New York Bot. Gard. 9 (3): 235-392.
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Family
Annonaceae
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Scientific Name
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Description
Latin Diagnosis - Frutex 5 m alms, Petiolus niger, crassus, glaber, supra planus, 2-3 mm longus; lamina rigide chartacea, utrinque glaberrima, haud verrucosa, elliptica vel elliptico-obovata, basin versus interdum paulo angustata, ima basi late rotundata non decurrens apice rotundata et abrupte cuspidata, (12-) 18-27 cm longa et 5-11 cm lata; costa utroque latere prominens, nervi laterales I. utrinque 14-15, arcuato-adscendentes, 4-6 mm intra marginem conjuncti; reticulum venularum supra planum et vix conspicuum, subtus paulo prominens. Inflorescentiae e ramulis efoliosis exeuntes; pedicelli florum ca. 2.5 cm longi, tenues, brevissime et laxiuscule rufo-sericei. Sepala semiorbicularia, ca. 1 mm longa. Petala 12-14 mm longa et 9-10 mm lata, exteriora sericea, interiora praeter partem inter exteriora expositam tomentellam glabra. Stamina 1.5 mm longa, connectivi appendice setulosa. Ovaria dense ferrugineo-hirsuta. (Fructus ignotus.)
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Discussion
TYPE: BRAZIL: Estado da Amazonas, Rio Negro, Porto Curucuhy, terreno arenoso, with flowers, Oct. 6, 1945, Ricardo de Lemos Froes 21110. (NY).
Unonopsis rigida is closely allied to U. stipitata Diels and like that species is characterized by large rigid leaves and by the occurrence of hairs on the connective shields. However, it differs conspicuously in the form of the leaves which are rounded at the base, not cuneate, by very short and thick petioles, and by thinner and less hairy peduncles.