Drosera tentaculata Rivadavia 2003
Creators: name: Gonella, Paulo Minatel
name: Sano, Paulo Takeo
name: Rivadavia, Fernando
name: Fleischmann, Andreas
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Caryophyllales
Droseraceae
Drosera
Drosera tentaculata

description: 29. Drosera tentaculata Rivadavia (2003: 79). Figures 7d, 21g –i
Type: — BRAZIL. MINAS GERAIS: Diamantina, no alto da cachoeira dos Cristais, estrada para Biribiri, c. 1000 m alt., 31 July 2002, Rivadavia-Lopes & Gibson 1376 (holotype SPF-157000!).
Perennial, rosetted, acaulescent or often forming short compact columns of dead marcescent leaves. Leaves decumbent, with geniculate vernation, obovate, obovate-cuneate or cuneate, apex with 7–9(–12) large bilaterally-symmetrical tentacles 4–9 mm long, 0.4–0.5(0.6) mm wide at the base, each with a narrowly-obcuneiform stalk and a linearlyrectangular head 0.7–1.2(–1.5) mm long; stipules rectangular in outline, apical 1/2 to 2/3 divided into three unequal fimbriate segments. Scapes erect at the base, glandular-pilose from base to apex, occasionally sparsely eglandularpilose at the base; petals pink; gynoecium 3-carpelate, styles bifurcated at the base. Seeds ovoid-ellipsoid, testa reticulate (based on Rivadavia et al. 2014).
Illustrations: —Rivadavia (2003: 80, fig. 1—habit and details); Rivadavia et al. (2014: 159, fig. 8—habit and details).
Distribution: — Brazil (Northeast: BA; Southeast: MG), endemic. Restricted to the Espinhaço Range where it is disjunctly distributed with a southern range in Minas Gerais, from the Serra do Cipó to Itacambira, and a northern range in Bahia, in the southwestern region of the Chapada Diamantina (Fig. 7d).
Habitat: — Drosera tentaculata is known from a wide range of habitats in campo rupestre vegetation. It usually grows on the margins of seasonal springs, or on drier hilltops in fine white sand with quartz gravel, in cracks on sandstone, or over a thin layer of soil over sandstone, often sympatric and syntopic with other Drosera spp. At one site near Gouveia, exceptionally large plants grow in peaty-sandy soil in a perennially waterlogged seepage. Found at elevations between 800–1600 m.
Conservation status: —Least Concern (LC). Drosera tentaculata is widespread (AOO= 232 km 2, EOO= 48,509 km 2) and usually locally abundant. It occurs in several protected areas including Serra do Cipó and Sempre Vivas National Parks, as well as Biribiri, Rio Preto, and Serra do Cabral State Parks (all in Minas Gerais), being thus considered of Least Concern.
Notes: — Drosera tentaculata belongs to the D. montana alliance (Rivadavia et al. 2014), being distinguished from its congeners by obovate to cuneate leaves, geniculate leaf vernation (Figs. 2b, 3b; vs. circinate in the other three species), and conspicuously developed unifacial marginal glands (“snap tentacles”) at the marginal apex of the leaves (Fig. 21g, h).
Specimens examined: —For a complete listing, see Rivadavia et al. (2014: 162–163).
description: Published as part of Gonella, Paulo Minatel, Sano, Paulo Takeo, Rivadavia, Fernando & Fleischmann, Andreas, 2022, A synopsis of the genus Drosera (Droseraceae) in Brazil, pp. 1-76 in Phytotaxa 553 (1) on page 61, DOI: 10.11646/phytotaxa.553.1.1, http://zenodo.org/record/6796689