Drosera roraimae (Diels) Maguire & J.R.Laundon

  • Authority

    Maguire, Bassett & Wurdack, John J. 1957. The Botany of the Guiana Highland -- Part II. Mem. New York Bot. Gard. 9 (3): 235-392.

  • Family

    Droseraceae

  • Scientific Name

    Drosera roraimae (Klotzsch ex Diels) Maguire & J.R.Laundon

  • Description

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    Species Description - Stem short, invested by marcescent leaves; leaves rosulate, more or less conspicuously tawny-strigose-hirsute on the lower surface; stipules conspicuous, lacerate, 0.4-0.6 mm long; petiole plane, 6-10 mm long; blade spathulate-obovate, ca. 3-5 mm broad, 5-6 mm long; scape 15-25 cm long; inflorescence coarsely stipitate-glandular, (5-) 10-15-flowered; flowers securid; pedicels 3-4 mm long; sepals stipitate-glandular, oblong-elliptic, acutish, 3.5-4.5 mm long (non-fertile flowers smaller); petals broadly obovate, 6-8 mm long; styles 3, dissected to the geniculate base, the apices forked; seed black, subclavate, 0.8-1.0 mm long, rounded-truncate at the apex, narrowed at the base, prominently low-bullatepapillate, the papillae in 15-20 more or less vertical rows.

  • Discussion

    D. montana St.-Hil. var. roraimae Klotzsch ex Diels. Pflanzenreich 4 (112): 90. 1906.

    D. montana St.-Hil. var. robusta Diels, Notizb. 6: 136. 1914.

    TYPE: Schomburgk 1034, Mt. Roraima [Venezuela].

    Closely related to the variable, poorly understood and inadequately circumscribed population comprising Drosera montana St.-Hil., sensu lat., of the Brazilian Plateau, which is ordinarily a much smaller plant with a finer glandular pubescence, much shorter (3mm) stipules, and seed which are smaller, with more acute bases, and 8-10 sharply defined vertical rows of papillae.

  • Distribution

    Distribution. Wet boggy or sandy habitats, plateaus and mountain summits, on sandstone, throughout the Guayana Highland. Often flowers of some plants fail of fertilization or for some reason become abortive and do not produce seed. The flowers of such plants are smaller than those of fertile plants. Specimens deposited at New York: BRITISH GUIANA: Chinowieng, Ayanganna Plateau, Maguire & Maguire 40645. VENEZUELA: Gran Sabana, Mt. Roraima: Tate 349, 373, 432A: Pinkus 98; Steyermark 58784, 58858;

    Guyana South America| Venezuela South America|