Drosera graomogolensis T. Silva 1997
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 graomogolensis

description: 14. Drosera graomogolensis Silva (1997: 85). Figures 6b, 13d–f
Type: — BRAZIL. Minas Gerais: Grão Mogol, Córrego da Bonita, subida para o Morro Jambeiro, 800 m, 07 September 1990, Silva et al. CFCR 13506 (holotype SPF-00071286!; isotype RB-00516351!).
= Drosera villosa var. graomogolensis T.Silva ex Rivadavia (1995: 135) nom. inval.
Perennial, rosetted, column forming, columns usually 15–40 mm, but reaching up to 270 mm long, densely covered by marcescent leaves. Leaves semi-erect, with circinate vernation, lanceolate to oblong-lanceolate, petioles much shorter than the lamina, adaxial petiole surface glabrous, abaxial leaf surface densely eglandular-pilose; stipule rectangular in outline, apical half to third fimbriate. Scape erect (occasionally slightly curved) at the base, densely glandularpilose from base to apex, trichomes short, up to 0.4(–0.5) mm long. Flowers large (petals 7.5–11.0 mm long, pink); gynoecium 3-carpelate, styles bifurcated at the base, long (4.0– 4.5 mm long). Seeds oblong-ovoid to ellipsoid, 0.5–0.6 mm long, black, testa reticulate (based on Gonella et al. 2014).
Illustrations: — Silva (1997: 86, fig. 1—habit and details); Gonella et al. (2014: 18, fig. 8—habit and details).
Distribution:— Brazil (Southeast: MG), endemic. Restricted to the northern part of the Espinhaço Range in northern Minas Gerais (Fig. 6b).
The species was previously considered endemic to the municipality of Grão Mogol (Silva 1997, Silva et al. 2013), but with the discovery of new sites and herbarium records (see Gonella et al. 2014) it has turned out to be more widespread, also occurring further south in the municipalities of Botumirim and Itacambira.
Habitat: —Sandy-peaty soils in seasonally or permanently moist to very wet areas of campos rupestres vegetation. Usually around the edges of seasonal springs in sandy peat-based soil with coarse quartz gravel, shallow sand overlying rocks, and in cracks of quartzite. However, D. graomogolensis is also common along the margins of perennial rivers and streams, seepages and perennially boggy areas associated with Sphagnum carpets, where it forms large and dense populations. Found between 700–1420 m a.s.l.
Phenology:— Found in flower from July to October.
Conservation status:—Endangered (EN) B1ab(iii)+2ab(iii). Both measurements of occurrence (EOO= 1,137.9 km 2, AOO= 60 km 2) suggest the placement of D. graomogolensis in this category of threat, in accordance with Silva et al. (2013). Although occurring inside the Grão Mogol and Botumirim State Parks, D. graomogolensis is widely threatened by habitat transformation for agriculture and cattle ranching purposes, and reduction of habitat quality by invasive grasses and climate change.
Notes:— Drosera graomogolensis belongs to the D. villosa affinity (Gonella et al. 2014), being most similar to D. ascendens, from which it is distinguished by leaves with petioles much shorter than the lamina (Fig. 13e), scape with erect base (Fig. 13d; occasionaly slightly curved), and much shorter and less conspicuous glandular trichomes on the scape (up to 0.5 mm long vs. up to 1.8 mm long).
The name D. villosa var. graomogolensis was first used in the Master’s thesis of Silva (1994), therefore not constituting an effective publication under Art. 30.9 of ICN (Turland et al. 2018). Although the reproduction of the name in Rivadavia (1995) met the requirement for effective publication, the lack of indication of a type rendered the name invalid (Art. 40.1; Turland et al. 2018) nonetheless.
Specimens examined: —For a complete list, see Gonella et al. (2014: 20–21).
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 pages 39-40, DOI: 10.11646/phytotaxa.553.1.1, http://zenodo.org/record/6796689