|
fewflower Draba
|
thickleaf Draba
|
| Perennials; caudex branched (with persistent, thickened leaf midveins); scapose. |
Perennials; (cespitose); caudex simple or branched (well-developed, with persistent leaf bases); not scapose. |
unbranched, (0.05–)0.1–0.8 dm, pubescent throughout, sometimes sparsely so distally, trichomes simple, 0.3–0.7 mm, and 2–4-rayed, 0.05–0.2 mm. |
(decumbent to ascending), unbranched, (0.4–)0.6–1.3(–1.5) dm, usually glabrous proximally, rarely sparsely pubescent, pubescent distally, trichomes simple and short-stalked, 2-rayed, (crisped), 0.1–0.6(–0.8) mm. |
(not imbricate); rosulate; petiolate; petiole ciliate, (trichomes simple and 2-rayed, 0.4–1.3 mm); blade oblanceolate, 0.5–1.1 cm × 1.5–4 mm, margins entire, (pubescent as petiole, apex acute to subacute, trichomes simple and/or branched), surfaces pubescent, abaxially with simple trichomes, to 1 mm, and stalked, 2–4-rayed ones, 0.1–0.5 mm, adaxially with simple trichomes, 0.4–1 mm, (sometimes glabrous). |
rosulate; petiolate; petiole ciliate, (trichomes mostly simple, 0.3–0.8 mm); blade oblanceolate, 2–6(–7) cm × 2.5–8(–10) mm, margins entire, (pubescent as petiole), surfaces glabrous. |
0. |
2–4(–6); sessile; blade ovate to oblong, margins entire, (ciliate, trichomes simple and stalked, 2-rayed). |
2–8-flowered (congested), ebracteate, slightly elongated in fruit; rachis not flexuous, pubescent as stem. |
(4–)8–20(–25)-flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent, trichomes simple and short-stalked, 2-rayed, (crisped), (0.1–0.8 mm). |
sepals ovate, 1.8–2.3 mm, pubescent, (trichomes simple with fewer, short-stalked ones); petals pale yellow, narrowly spatulate to oblanceolate, 2.5–3 × 0.8–1.5 mm; anthers ovate, 0.2–0.3 mm. |
sepals (green tinged purplish), ovate to oblong, 2–3(–3.3) mm, pubescent, (trichomes simple and 2-rayed); petals yellow, spatulate to subobovate, 3.5–5(–6) × (2–) 2.5–3.5(–4) mm; anthers ovate, 0.5–0.6 mm. |
divaricate to ascending, straight or slightly curved upward, 1.5–4 mm, pubescent as stem or trichomes branched. |
divaricate-ascending, straight, 5–10(–15) mm, pubescent as rachis. |
often obovate, plane, slightly flattened, 5–10 × (3–)3.5–5 mm; valves glabrate or sparsely pubescent, 0.05–0.2 mm; ovules 8–16(–20) per ovary; style 0.05–0.15 mm. |
lanceolate to ovate-lanceolate, slightly twisted, flattened, (7–)8–14 × 3–5 mm; valves glabrous; ovules 16–20 per ovary; style (0.4–)0.7–1.2(–1.5) mm. |
ovoid, 1.1–1.6 × 0.7–1 mm. |
oblong, 1.2–1.7 × 0.8–1.1 mm. |
= 32. |
= 24. |
|
|
|
|
| Flowering Jun–Aug. |
Flowering Jul–Aug. |
| Damp rocky slopes, tundra, swales, dry silt plains |
Rock outcrops and talus, alpine tundra, rocky meadows |
| 0-1000 m (0-3300 ft) |
2900-4300 m (9500-14100 ft) |
|
AK; NT; NU; Greenland; Europe (Norway [Svalbard], Russia); e Asia (Russian Far East, n Siberia) |
CO; MT; NM; UT; WY
|
O. E. Schulz (1927) recognized five varieties within Draba pauciflora, of which four were listed from North America. Schulz’s concept of D. pauciflora encompassed multiple taxa that we recognize as separate species, including D. micropetala and D. subcapitata. C. L. Hitchcock (1941) and R. C. Rollins (1993) did not mention D. pauciflora; the latter (and G. A. Mulligan 1974b) referred the North American material to D. adamsii. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Draba crassa is easily recognized by its combination of fleshy, distinctly petiolate leaves with glabrous surfaces and mostly decumbent flowering/fruiting stems. N. H. Holmgren (2005b) indicated that it has 52 seeds per fruit (26 per locule), but in the plants we examined, the seed count did not exceed 20 per fruit. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
| FNA vol. 7, p. 326. |
FNA vol. 7, p. 302. |
| Brassicaceae > tribe Arabideae > Draba |
Brassicaceae > tribe Arabideae > Draba |
D. abajoensis, D. albertina, D. aleutica, D. alpina, D. aprica, D. arabisans, D. arctica, D. arctogena, D. argyrea, D. arida, D. asprella, D. asterophora, D. aurea, D. aureola, D. bifurcata, D. borealis, D. brachycarpa, D. brachystylis, D. breweri, D. burkei, D. californica, D. cana, D. carnosula, D. chamissonis, D. cinerea, D. corrugata, D. corymbosa, D. crassa, D. crassifolia, D. cruciata, D. cuneifolia, D. cusickii, D. cyclomorpha, D. daviesiae, D. densifolia, D. exunguiculata, D. fladnizensis, D. glabella, D. globosa, D. graminea, D. grandis, D. grayana, D. heilii, D. helleriana, D. hitchcockii, D. howellii, D. incana, D. incerta, D. incrassata, D. inexpectata, D. jaegeri, D. juvenilis, D. kassii, D. kluanei, D. lactea, D. lemmonii, D. lonchocarpa, D. longisquamosa, D. macounii, D. maguirei, D. malpighiacea, D. micropetala, D. mogollonica, D. monoensis, D. mulliganii, D. murrayi, D. nemorosa, D. nivalis, D. norvegica, D. novolympica, D. oblongata, D. ogilviensis, D. oligosperma, D. oreibata, D. oxycarpa, D. palanderiana, D. paucifructa, D. paysonii, D. pectinipila, D. pedicellata, D. pennellii, D. petrophila, D. pilosa, D. platycarpa, D. porsildii, D. praealta, D. pterosperma, D. ramosissima, D. ramulosa, D. rectifructa, D. reptans, D. ruaxes, D. santaquinensis, D. saxosa, D. scotteri, D. serpentina, D. sharsmithii, D. sibirica, D. sierrae, D. simmonsii, D. smithii, D. sobolifera, D. spectabilis, D. sphaerocarpa, D. sphaeroides, D. standleyi, D. stenoloba, D. stenopetala, D. streptobrachia, D. streptocarpa, D. subalpina, D. subcapitata, D. subumbellata, D. trichocarpa, D. ventosa, D. verna, D. viridis, D. weberi, D. yukonensis, D. zionensis |
D. abajoensis, D. albertina, D. aleutica, D. alpina, D. aprica, D. arabisans, D. arctica, D. arctogena, D. argyrea, D. arida, D. asprella, D. asterophora, D. aurea, D. aureola, D. bifurcata, D. borealis, D. brachycarpa, D. brachystylis, D. breweri, D. burkei, D. californica, D. cana, D. carnosula, D. chamissonis, D. cinerea, D. corrugata, D. corymbosa, D. crassifolia, D. cruciata, D. cuneifolia, D. cusickii, D. cyclomorpha, D. daviesiae, D. densifolia, D. exunguiculata, D. fladnizensis, D. glabella, D. globosa, D. graminea, D. grandis, D. grayana, D. heilii, D. helleriana, D. hitchcockii, D. howellii, D. incana, D. incerta, D. incrassata, D. inexpectata, D. jaegeri, D. juvenilis, D. kassii, D. kluanei, D. lactea, D. lemmonii, D. lonchocarpa, D. longisquamosa, D. macounii, D. maguirei, D. malpighiacea, D. micropetala, D. mogollonica, D. monoensis, D. mulliganii, D. murrayi, D. nemorosa, D. nivalis, D. norvegica, D. novolympica, D. oblongata, D. ogilviensis, D. oligosperma, D. oreibata, D. oxycarpa, D. palanderiana, D. pauciflora, D. paucifructa, D. paysonii, D. pectinipila, D. pedicellata, D. pennellii, D. petrophila, D. pilosa, D. platycarpa, D. porsildii, D. praealta, D. pterosperma, D. ramosissima, D. ramulosa, D. rectifructa, D. reptans, D. ruaxes, D. santaquinensis, D. saxosa, D. scotteri, D. serpentina, D. sharsmithii, D. sibirica, D. sierrae, D. simmonsii, D. smithii, D. sobolifera, D. spectabilis, D. sphaerocarpa, D. sphaeroides, D. standleyi, D. stenoloba, D. stenopetala, D. streptobrachia, D. streptocarpa, D. subalpina, D. subcapitata, D. subumbellata, D. trichocarpa, D. ventosa, D. verna, D. viridis, D. weberi, D. yukonensis, D. zionensis |
| D. adamsii |
D. chrysantha var. crassa |
| R. Brown: Chlor. Melvill., 266. (1823) |
Rydberg: Mem. New York Bot. Gard. 1: 182. (1900) |
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