Drosera lutescens ( Saint-Hilaire 1826: 263 ) Gonella, Rivadavia & A.Fleischm., 2022

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 : 49-50

19. Drosera lutescens ( Saint-Hilaire 1826: 263) Gonella, Rivadavia & A.Fleischm. comb. et stat. nov. Figures 7c, 15f–i, 18a–f

≡ Drosera hirtella var. lutescens Saint-Hilaire (1826: 263) .

Lectotype (designated here):— BRAZIL. Goiás: Dans la Serra dos Pyreneos Campos de Goyas [in the Serra dos Pirineus, Goiás State], s.d., Saint-Hilaire C 1-720bis (P-00749157!; isolectotypes P-00749159!, MPU-009951 image!).

Seasonal geophyte perennial, rosetted, acaulescent. Leaves decumbent, with geniculate-involute vernation, distinctly petiolate, spatulate, lamina narrowly obovate to spatulate (Fig. 15g), vinaceous (greenish in shaded environments); stipules rectangular in outline, divided into several laciniae from near the base. Scapes slightly arcuate at the base (Figs. 15f, 18b), yellowish-green in color (Fig. 18a–e), densely eglandular-pilose on the basal half, reducing in density towards apex (eglandular trichomes white, 1.5–2.0 mm long; Fig. 18d, e), becoming densely glandular-pilose towards the apical half; sepals exclusively glandular-pilose (Fig. 18f) or also with sparse eglandular trichomes; petals pink; gynoecium 3-carpelate, styles bifurcated at the base. Seeds ovoid, testa reticulate.

Illustrations: — Hoehne [1915: t. 124, fig. 2—habit and details, as D. montana var. schwackei Diels (1906: 89) ]; this work, Figure 15f–i (habit and details).

Distribution: — Brazil (Central-West: GO, MS, MT; Southeast: MG, SP; Fig. 7c) and Bolivia (Santa Cruz) (Fig. 6). The taxon was first recorded for Bolivia as D. hirtella var. lutescens by Fleischmann & Duno de Stefano (2014).

Phenology:— Drosera lutescens has been collected in flower from January to July (mid wet season to mid dry season). From July to November (mid dry season to early wet season) the plants are usually dormant underground as roots, when only dry leaves and scapes may be visible.

Habitat: — Drosera lutescens is widespread in the western Cerrado domain, where it occurs in seasonally wet areas with sandy soils, such as the margins of veredas and springs, more rarely also growing in clayish soils. It is also known from wet seepages of campo rupestre vegetation in Goiás, Minas Gerais and São Paulo. Found at elevations between 600–1600 m .

Conservation status: —Least Concern (LC). Drosera lutescens is widespread and common ( Brazil: AOO= 124 km 2, EOO= 533,704 km 2; global: AOO= 128 km 2, EOO= 668,497 km 2), occurring in the National Parks of the Chapada dos Guimarães (MT), Emas (GO), and Serra da Canastra (MG), as well as the State Parks of Serra de Caldas Novas and Serra dos Pirineus (GO), and Furnas do Bom Jesus (SP).

Notes: — Drosera lutescens is most similar to D. hirtella , but is distinguished by a combination of characters discussed under that species.

It is here elevated to species rank, being considered morphologically and ecologically distinct enough from D. hirtella to justify this taxonomic status. This classification is supported by the species’ distinct and mostly allopatric distribution (see discussion under D. hirtella and Fig. 7b, c).

Possibly due to the dense indumentum of eglandular trichomes on the scape (Fig. 18d, e), specimens of D. lutescens have been misidentified as D. montana var. schwackei (here treated as D. schwackei ) by Hoehne (1915) and Silva & Giulietti (1997).

Drosera lutescens occasionally hybridizes with D. communis and D. hirtella , when growing syntopically with either species (see under those species for discussion and ‘Natural Hybrids’ below for specimens).

The correct number for Saint-Hilaire’s type specimen of D. hirtella var. lutescens is “ C1-720bis ”, as handwritten by him on the small tags attached to the specimens (“ 720bis ”), and also in Saint-Hilaire’s field notebook (A. de SaintHilaire virtual herbarium, 2020). The collection number originally added to the herbarium label of P-00749157 reads “ C1-1762 ”, possibly a confusion with the collection number of D. hirtella , which is “ B1-1762bis ”.

Representative specimens examined: — BRAZIL. GOIÁS: Corumbá de Goiás, entre a cachoeira Corumbá e Cocalzinho de Goiás , 01 July 2007, Rivadavia & Batista 2669 ( SPF) . Cristalina , c. 5 km ao noroeste de Cristalina, 30 June 2007, Rivadavia & Batista 2650 ( SPF) . Mossâmedes, Reserva Biológica da Serra Dourada , 01 May 1999, Rivadavia-Lopes & Sato 989 ( SPF) . Serra dos Pirineus , ca. 15 km (straight line) N of Corumbá de Goiás, 16 May 1973, Anderson 10396 (NY, UB) . MATO GROSSO: Chapada dos Guimarães, Parque Nacional da Chapada dos Guimarães , 30 April 1995, Rivadavia-Lopes 424 ( SPF) ; estrada Cuiabá-Chapada dos Guimarães , 18 March 2007, Rivadavia & Cardoso 2476 ( SPF) . MATO GROSSO DO SUL: Corumbá, Serra do Amolar, entre Parque Nacional do Pantanal e Fazenda Mandioré , 10 May 2003, Pott et al. 6293 ( HMS, HUEFS) . MINAS GERAIS: Delfinópolis, estrada para Condomínio de Pedras , 17 May 2003, Pacheco et al. 648 ( HUFU) . Ibiraci, estrada de Cristais Paulistas para Lage e Ibiraci , 11 March 2006, Rivadavia 2175 ( SPF) . Tiradentes, Serra de São José , 02 May 2008, N.G. Silva 267 (R) . SÃO PAULO: Estreito, estrada de Cristais Paulistas para Lage e Ibiraci , 11 March 2006, Rivadavia 2170 ( SPF) . Pedregulho, Parque Estadual das Furnas do Bom Jesus , 16 March 2003, Sasaki et al. 167 ( SPF) .

Material outside of Brazil examined: — BOLIVIA. SANTA CRUZ: Chiquitos, sobre la meseta de Motacu, 11 April 2008, Wood et al. 24397 (UB, USZ) .