Flora del Cono Sur · Ficha del taxón
Perennial herbs, 10–20 cm tall, multi-stemmed, stems ascending to erect, simple, densely leafy at base and more loosely in upper part, grayish-woolly, with basal rosette of leaves, persisting at flowering. Leaves broadly obovate or obovate, attenuate at base, apex rounded to obtuse, mucronate, margins flat; concolor ous, grayish-woolly on both surfaces; trichomes long, eglandular, eseptate, with basal cells expanded; basal leaves 25–35 × 8–12 mm, cauline leaves 10–30 × 3–10 mm, gradually diminishing in size upward. Ca pitula many, in clusters in axils of upper leaves, ar ranged in continuous, elongated spikes, interrupted at base. Involucre narrowly campanulate, 3.5–4 × 1.6 2.2 mm. Phyllaries 4- or 5-seriate, lamina stramineous; outer phyllaries ca. 3 × 1–1.2 mm, lanceolate, apex acuminate, sparsely lanuginose; inner phyllaries 3–3.8 × 0.5–0.8 mm, oblanceolate, apex acute, glabrous. Pis- tillate florets 50 to 70, corolla 2.2–2.5 mm. Bisexual florets 3 or 4, corolla 2.4–2.8 mm, 5-lobed, anthers 5. Achenes ca. 0.7 mm, subglabrous to sparsely pilose, with short, globose duplex trichomes. Pappus bristles ca. 2.5 mm.
Brazil. Rio Grande do Sul: São José dos Ausentes, Serra da Rocinha, 14 Nov. 2003, L. P. Deble, A. S. de Oliveira & J. N. C. Marchiori 6352 (holotype, SI-001114!*).
Gamochaeta nigrevestis is endemic to southern and southeastern Brazil (Deble et al., 2006; Deble & Marchiori, 2007; Loeuille, 2010) in the Amazonian dominion (Cabrera & Willink, 1973), where it occurs in rocky soils at elevations above 1000 m.
Freire, S. E., Grossi, M. A., Bayón, N. D., Monti, C., Iharlegui, L. & Migoya, M. A. (2024). Taxonomic revision and morphometric analysis of Gamochaeta (Asteraceae, Gnaphalieae). Annals of the Missouri botanical garden, 109, 244-320.
Deble, L. P., Marchiori, J. N. C. & Oliveira, A. S. (2006). Cinco novas espécies brasileiras do gênero Gamochaeta Weddel (Asteraceae-Gnaphalieae). Balduinia, 6, 14-24.
Brasil · Rio Grande do Sul · Serra da Rocinha
Registros de herbario determinados actualmente con este nombre.
Seleccione un encabezado para ordenar; vuelva a pulsarlo para invertir el orden.
| 6352 | Brasil | Rio Grande do Sul | Serra da Rocinha | 14/11/2003 |
Sin datos de conservación registrados.
Fuente: Flora Vascular de la República Argentina.
Evaluación internacional
La consulta a la UICN no estuvo disponible. Se conserva el criterio local.
Recognition. Gamochaeta nigrevestis is grouped with three species from southern Brazil: G. diffusa, G. erecta, and G. girardiana (Fig. 3A). All these species are multi-stemmed herbs with concolorous or not mark edly discolorous, obovate or broadly obovate leaves, and capitula arranged in spikes. Gamochaeta nigrevestis most closely resembles G. diffusa in its rosulate basal leaves. However, it has capitula arranged in continu ous spikes that are interrupted proximally (vs. capitula in discontinuous, elongated spikes in G. diffusa).