Draba subcapitata


Vasc. Pl. Fl. Ellesmereland, 87, fig. 3, plate 1, figs. 3–8. 1906.

Treatment appears in FNA Volume 7. Treatment on page 342. Mentioned on page 281, 284, 285, 316, 326.

Perennials; (cespitose, pulvinate); caudex often branched (covered with persistent, thickened petioles, branches sometimes terminating in sterile rosettes); scapose. Stems unbranched, (0.04–)0.07–0.5(–0.6) dm, usually pubescent throughout, rarely glabrous distally, trichomes simple and 2-rayed, 0.2–0.6 mm, with smaller, dendritic ones. Basal leaves (densely imbricate); rosulate; petiolate; petiole margin ciliate, (trichomes simple and 2-rayed, 0.3–0.8 mm); blade oblanceolate to obovate or nearly linear, 0.2–0.8(–1.1) cm × 1–3 mm, margins entire, (pubescent as abaxial surface), surfaces pubescent abaxially, glabrous adaxially, with simple and stalked, 2-rayed trichomes, 0.3–0.8 mm, sometimes with subdendritic ones, 0.1–0.3 mm, (midvein persistent, strongly thickened). Cauline leaves 0. Racemes 2–8-flowered, ebracteate, (corymbose), slightly elongated in fruit; rachis not flexuous, usually pubescent as stem, (trichomes often crisped), rarely glabrous. Fruiting pedicels horizontal to divaricate, straight, 1–5(–7) mm, usually pubescent as rachis, rarely glabrous. Flowers: sepals oblong, 1.2–1.8 mm, pubescent, (trichomes simple); petals white or creamy white, spatulate, 1.5–2(–2.5) × 0.7–1 mm; anthers ovate, 0.2–0.3 mm. Fruits ovoid to oblong, plane, slightly inflated, 3.5–6 × 2–3 mm; valves usually glabrous, rarely puberulent, trichomes simple, 0.05–0.15 mm; ovules 14–24 per ovary; style 0.1–0.3 mm. Seeds oblong, 0.9–1.1 × 0.5–0.6 mm. 2n = 16.

Phenology: Flowering Jul–Aug.
Habitat: Talus slopes, limestone barrens, peaty bluffs, silty slopes, seepage areas, disturbed gravel
Elevation: 0-1000 m


V7 479-distribution-map.gif

Greenland, N.W.T., Nunavut, Que., Alaska, Europe (Norway, n Sweden), e Asia (Russian Far East, Siberia).


Selected References


Lower Taxa

... more about "Draba subcapitata"
Ihsan A. Al-Shehbaz +, Michael D. Windham +  and Reidar Elven +
Simmons +
Greenland +, N.W.T. +, Nunavut +, Que. +, Alaska +, Europe (Norway +, n Sweden) +, e Asia (Russian Far East +  and Siberia). +
0-1000 m +
Talus slopes, limestone barrens, peaty bluffs, silty slopes, seepage areas, disturbed gravel +
Flowering Jul–Aug. +
Vasc. Pl. Fl. Ellesmereland, +
Abdra +, Erophila +, Nesodraba +  and Tomostima +
Draba subcapitata +
species +