Drosera latifolia

Gonella, Paulo Minatel, Sano, Paulo Takeo, Rivadavia, Fernando & Fleischmann, Andreas, 2022, A synopsis of the genus Drosera (Droseraceae) in Brazil, Phytotaxa 553 (1), pp. 1-76 : 48-49

18. Drosera latifolia (Eichler in Martius & Eichler 1872: 395) Gonella & Rivadavia in Gonella et al. (2014: 21). Figures 5a , 17g –i

≡ D. villosa var. latifolia Eichler in Martius & Eichler (1872: 395).

Lectotype (designated by Silva & Giulietti 1997):— BRAZIL. Rio de Janeiro: Serra dos Órgãos, 13 December 1869, Glaziou 3868 (R-000008849!; isolectotypes K-000432551!, P-00706179!, P-05113030!).

= Drosera villosa var. bifurca Buxbaum (1924: 119) .

Type: — BRAZIL. São Paulo: prope Campo Grande inter Santos et urben S. Paulo, 750 m, 1902, M. Wacket s.n. (holotype WU-0045462 image!; isotype W-1924-0004935!) .

Perennial, rosetted, acaulescent, rarely with short upright columns up to 10 cm long. Leaves semi-erect, with circinate vernation, petioles much to slightly shorter than the lamina, transversely flat and 1–3(–4) mm wide, adaxial petiole surface glabrous to glabrescent; lamina lanceolate, oblong, or broad to narrowly oblong-lanceolate (oblong-elliptic); stipules rectangular in outline, apical half to third fimbriate. Scape erect at the base, base glabrous to sparsely eglandularpilose, apex glandular-pilose. Flowers with petals 5.0– 8.5 mm long, pink; gynoecium 3-carpelate, styles bifurcated at the base. Seeds fusiform, 0.8–1 mm long, testa reticulate (based on Gonella et al. 2014).

Illustrations: —Eichler (1872: t. 91, fig. 1—habit and details—as D. villosa ); Buxbaum (1924: 120, 121 figs. 1, 2—habit and calyx—as D. villosa var. bifurca ); Gonella et al. (2014: 23, 24, figs. 11, 12—habit and details).

Distribution: — Brazil (Southeast: ES, MG, RJ, SP; South: PR, SC), endemic ( Fig. 5a ). Found on the Serra do Mar, Serra da Mantiqueira and Espinhaço Range mountain complexes.

Habitat: —On the Serra do Mar and Serra da Mantiqueira, D. latifolia can be found growing in campos de altitude vegetation and in open, sometimes disturbed, highland areas, usually on thin layers of organic matter over rocks or on red clayish soils, while in the Espinhaço Range it grows in campos rupestres, on islands of vegetation along streams, in sandy or peat-based soils. Drosera latifolia is one of the few Brazilian species that can also be found growing semishaded along river margins inside riparian forests. Found at elevations between 700–2550 m.

Phenology:— The flowering period varies across the range of D. latifolia : September to February on the Serra do Mar and Serra da Mantiqueira, and June to September (December) on the Espinhaço Range with a secondary flowering peak in February–March.

Conservation status: —Least Concern(LC). Drosera latifolia is widely distributed(AOO= 200 km 2, EOO= 478,427 km 2) and common. It is found within several National Parks (Caparaó, Itatiaia, Sempre-Vivas, Serra da Bocaina, Serra dos Órgãos ) and the State Parks of Pico do Itambé, Rio Preto and Serra do Cabral in Minas Gerais state, and Ilha do Cardoso and Serra do Mar in São Paulo state.

Discussion: — Drosera latifolia belongs to the D. villosa alliance ( Gonella et al. 2014), being most similar to D. villosa , from which it is distinguished by petiole usually much shorter than lamina (Fig. 17g, h; vs. slightly shorter to equal in length), adaxial petiole surface and scape base glabrous to only sparsely eglandular-pilose (Fig. 17g; vs. densely eglandular-pilose). The species is also vegetatively similar to D. chimaera , but is distinguished by characters discussed under that species.

Drosera latifolia is highly variable regarding leaf shape (Fig. 17g, h) and indumentum, with six geographical morphotypes recognized by Gonella et al. (2014).

Sterile hybrids with D. tomentosa were observed at a few localities on the Espinhaço Range ( Gonella et al. 2014: 11, fig. 5B, D, E; see under ‘Natural Hybrids’).

Specimens examined: —For a complete list, see Gonella et al. (2014: 28–30).

Additional specimen examined:— BRAZIL. Espírito Santo: São Roque do Canaã, Alto Misterioso, 15 November 2004, Fontana et al. 1072 (MBML).

Figures

FIGURE 5. Distribution maps of Drosera species with broad distribution ranges in Brazil. a, D. latifolia. b, D. montana. c, D. sessilifolia.