Drosera roraimae

Description

Caulescent herb forming an apical rosette. Stem up to 10 cm long, invested by marcescent leaves. Leaves spathulate, 10-25 mm long, petiole and blade well defined; stipules coriaceous and conspicuous, 3-7 mm long, 3-7-partite; petiole 6-15 x 1-2 mm, conspicuously hairy beneath; blade obovate, 4-10 x 2-4 mm, hairy beneath. Inflorescences 1-2(-4) per plant, 8-30 cm long, (4-)6-20-flowered; peduncle erect or curved near base, 8-20 cm long, with glandular hairs or sessile glands, rarely glabrous. Flowers with sepals ovate or narrowly ovate, joined at base, 4-5 x 1-2 mm, margin entire, with glandular hairs outside; petals white or pink, spathulate, 4-6 x 2-2.5 mm; stamens 4-6 mm long; pollen tetrad 55-75 µm diameter, spines and spinules present, spine 2 µm long, 9-14 µm2; ovary with 3 styles, bipartite near base. Seeds foveolate-reticulate, narrowly oblongoid, 0.4-0.6 x 0.15-0.30 mm, covered with granulate wax.

Distribution

Venezuela (Amazonas and Bolívar), Guyana (Pakaraima) and Brazil (Cerro de La Neblina); most common species in the Guayana Highland of Venezuela; more than 100 collections studied, 12 from Guyana (GU: 12).

Synonymy

Drosera roraimae (Diels) Maguire & J.R. Laundon in Maguire & Wurdack, Mem. New York Bot. Gard. 9: 333. 1957 sec. S.L. Maina, A.S.J. van Proosdij, R. Duno de Stefano & al., 2004
  • Drosera montana var. roraimae Diels in Engl., Pflanzenr. 112: 90. 1906
    • Holotype: Venezuela, Bolivar, Mt. Roraima, Ri. Schomburgk 1034.
  • =Drosera montana var. robusta Diels in Notizbl. Bot. Gart. Berlin-Dahlem 6: 136. 1914

Images

Specimens

CountryDateCollector + collecting numberHerbariaTypeScanDerivatives
Guyana, Republic ofMaguire et al. 40645NY
Citation: Guyana, Republic of, Mt. Ayanganna, Kaieteur Plateau, Maguire et al. 40645.

Specimen summary: NY

Guyana, Republic ofMaas et al. 5660U, NY
Citation: Guyana, Republic of, Pakaraima Mts., Mt. Aymato, Maas et al. 5660.

Specimen summary: U

Specimen summary: NY

Ri. Schomburgk 1034
Citation: Venezuela, Bolivar, Mt. Roraima, Ri. Schomburgk 1034.

Specimen summary: Venezuela, Bolivar, Mt. Roraima, Ri. Schomburgk 1034.
Holotype of Drosera roraimae (Diels) Maguire & J.R. Laundon Drosera montana var. roraimae Diels