Drosera pilosa Exell & J.R.Laundon

Rjosk, A., Neinhuis, C., Monizi, M. & Lautenschläger, T., 2022, Synopsis of the genus Drosera (Droseraceae) in Angola and the Democratic Republic of the Congo, Blumea - Biodiversity, Evolution and Biogeography of Plants 67 (1), pp. 1-14 : 12

9. Drosera pilosa Exell & J.R.Laundon — Fig. 11

Drosera pilosa Exell & J.R.Laundon (1956) 213;J.R. Laundon (1959) 4; (1970) 26; Troupin (1978) 305; A.S.Rob. et al. (2017) 1452. —

Type: A. Stolz s.n. (holo BM), Tanzania, Tanganyika territory, Kyimbila District , North of Lake Nyasa , 1885.

Acaulescent, perennial herb ( Fig. 11b ). Leaves in a basal rosette; stipules c. 3 mm long, connate at the base, apex lacer- ated; lamina elliptic, ovate or obovate, 4–13 by 2–8 mm, the adaxial surface and margins bearing tentacles, abaxially pilose ( Fig.11a ); petiole 3–15 by up to 2 mm, gradually broadening into the lamina, abaxially pilose. Inflorescences cymose, with 2 – 6 flowers; peduncles 1 or 2 together, 2–16 cm long, arising laterally from the rosette, ascending, canaliculate, pilose; bracts elliptic, 2–3 mm long; pedicels 1–7 mm long, pilose. Sepals 5, ± elliptic, 3–6 by 1.5–2.5 mm, apex acute, pilose. Petals 5, c. 6 mm long, red to purple. Stamens 5; filaments c. 4 mm long. Pollen in tetrads, tetrads c. 40–45 µm diam, single grains 30–35 µm diam, echinate (to baculate; Fig. 11e ), echini broadly conical, 1–2 mm long, in high density with short clavate sculptural elements between them. Pistil: ovary subglobose, c. 1.5 by 2 mm; styles 3, c. 2 mm long, bipartite to the base. Seeds ovoid, 0.3–0.5 by c. 0.2 mm, black, testa smooth ( Fig. 11f ).

Distribution — Angola, Burundi, Cameroun, DRC, Guinea, Kenya, Malawi, Ruanda, Sierra Leone, Tanzania ( Fig. 11c ).

Habitat & Ecology — Montane species.

Additional specimens (see Fig. 11d for province map). ANGOLA, Cuando Cubango, Cuito-Cuanavale , Longa , vale do Cuiriri , alt. 1360 m, 19 Mar. 1960, E.J. Mendes 3212 ( COI) . – DRC, Sud-Kivu, Environs de Kitwabaluzi , S2°53' E28°35', Dec.1942, Coutreaux 999 ( BR) ; Kabare,alt. 2200 m, 9 Dec. 1956, Christiaensen 1953 ( BR) ; Unknown province, Luemba , Sept. 1946, Kunet 32 ( BR) .

Note — Very similar to D. burkeana but with pilose peduncle, pedicels and sepals.

Figures

Fig. 11 Drosera pilosa Exell & J.R.Laundon. a. Leaf shape with the petiole broadening gradually into the lamina; b. general morpholog: acaulescent, leaves in a rosette and laterally arising, pilose inflorescences; c. distribution (grey) according to the literature; d. province map of Angola and DRC with localities of examined herbarium specimens; e. pollen in tetrads with echinate to baculate, broadly conical sculpture elements in high density; f. dry seed, 420 × 210 µm. — Scale bars: a = 1 cm; b = 2 cm; e = 10 µm; f = 20 µm.