Notes on Guiana Droseraceae
Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht , Volume 126 - Issue 1 p. 136- 138
A study of the Suriname species of the genus Drosera revealed the existence of a few problems and led to some new points of view with regard to the taxonomy of the tropical American species of this genus. A discussion of these problems (and an exposition of my views) including the description of a new species, are given in the following pages. According to the “Enumeration of the vascular Plants known from Surinam”, published by A. A. PULLE in 1906, no species of Drosera were at that time known from Suriname. In the same year L. DIELS published his monograph of the Droseraceae in “Das Pflanzenreich”. He mentioned from Guiana the following species: Drosera sessilifolia St. Hil., D. cayennensis Sagot ex Diels, D. capillaris Poir., D. montana St. Hil. var. roraimae Diels and, with some hesitation, D. pusilla H.B.K. and D. tenella Willd. Consequently at least part of these species were to be expected from Suriname. Investigation of herbarium specimens revealed a great confusion, especially with regard to the species D. pusilla H.B.K., D. tenella Willd. and D. capillaris Poir. At a first glance hardly any difference seemed to exist between D. pusilla and D. tenella, as the diagnostic characters, mentioned by DIELS, viz. length and number of peduncles, proved to be of no value. After examining the type collections of these two species however, a real difference, which proved to have been mentioned already by KUNTH, was found in the seeds. D. pusilla has subglobular and foveolate seeds, whereas the seeds of D. tenella are ovoid, longitudinally ribbed and papillose. In the general appearance of the plants another difference was found: the flowers of D. tenella proved to be proportionally smaller and the peduncles more slender and usually somewhat longer than in D. pusilla. When D. pusilla is defined in this way, it appears that it is up till now only known from Venezuela and Brazil, and not from Guiana.
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Brummer-Dinger, C. H. (1955). Notes on Guiana Droseraceae. Mededelingen van het Botanisch Museum en Herbarium van de Rijksuniversiteit te Utrecht, 126(1), 136–138.