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Rocky Mountain Draba
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Cape Thompson Draba
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| Perennials; (cespitose); caudex simple or branched (with persistent leaf bases); not scapose. |
Perennials; (cespitose, sometimes forming mats); caudex branched (covered with persistent leaf bases); not scapose. |
unbranched, 0.1–0.5(–0.8) dm, usually pubescent throughout, rarely glabrous, trichomes simple or subsessile, 2-rayed or spurred, (crisped), 0.1–0.5 mm. |
unbranched, 0.4–1.2 dm, pubescent throughout, trichomes minutely stalked, stellate, 8–12-rayed, (non-crisped), 0.03–0.3 mm, sometimes with simple and 2-rayed ones, to 0.3 mm. |
rosulate; petiolate; petiole ciliate, (trichomes usually straight and simple, rarely also 2-rayed, 0.2–0.6(–0.8) mm); blade linear to linear-oblanceolate, (0.5–)1–4 cm × 0.3–2(–3) mm, margins entire (pubescent as petiole), surfaces glabrous. |
rosulate; petiole (obsolete), margin usually not ciliate, (trichomes, when present, simple and 2-rayed, 0.2–0.35 mm); blade oblanceolate to obovate, 0.4–1 cm × 1–3 mm, margins denticulate or entire, surfaces pubescent with short-stalked, stellate, (non-crisped), 8–12-rayed trichomes, 0.05–0.2 mm, (midvein obscure abaxially). |
(1–)3–9(–12) (as bracts); sessile; blade linear to oblanceolate or lanceolate, margins entire, (ciliate proximally, similar to basal). |
(1 or) 2–7; sessile; blade broadly ovate, margins usually denticulate, rarely entire. |
3–15-flowered, bracteate, elongated in fruit; rachis not flexuous, usually pubescent as stem, rarely glabrous. |
4–10-flowered, proximalmost 1–5 flowers bracteate, elongated; rachis not flexuous, pubescent as stem. |
sepals ovate, 1.5–2.5 mm, glabrous or pubescent, (trichomes simple and short-stalked, 2-rayed); petals yellow, spatulate to obovate, 3–5 × 1.5–3 mm; anthers ovate, 0.3–0.5 mm. |
sepals ovate, 1.5–2.2 mm, pubescent, (trichomes simple and short-stalked, 2–5-rayed); petals white, obovate, 2–3.5 × 1.5–2 mm; anthers ovate, 0.2–0.3 mm. |
divaricate-ascending, usually straight, rarely curved upward, 3–10(–15) mm, usually pubescent as stem, rarely glabrous. |
ascending, straight, (4–)6–13(–20) mm, pubescent as stem. |
ovate-elliptic to lanceolate, slightly twisted or plane, flattened, 5–11 × 2.5–5 mm; valves glabrous; ovules 8–16 per ovary; style 0.2–0.7 mm. |
linear to narrowly lanceolate, slightly twisted or plane, flattened, 5–11 × 1.1–1.6(–2) mm; valves glabrous; ovules 16–20 per ovary; style 0.1–0.3 mm. |
ovoid, 1.2–1.5 × 0.7–1 mm. |
ovoid, 0.6–0.9 × 0.3–0.5 mm. |
= 18. |
= 16. |
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| Flowering Jul–Sep. |
Flowering Jun–Jul. |
| Rocky areas and ridges, alpine tundra, gravel bars in streams |
Rock cliffs, bluffs, wind-swept tundra |
| 3000-4100 m (9800-13500 ft) |
0-500 m (0-1600 ft) |
|
CO
|
AK; e Asia (Russian Far East, n Siberia) |
Of conservation concern. Draba graminea is occasionally confused with D. crassa, which occupies similar habitats and elevations. It is easily distinguished from the latter by having narrower [0.3–2(–3) versus 2.5–8(–10) mm wide] basal leaves and bracteate (versus ebracteate) racemes. It is known to us only from Hinsdale, La Plata, Ouray, San Juan, and San Miguel counties. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
C. L. Hitchcock (1941) treated Draba chamissonis as a variety of D. nivalis and listed it from British Columbia; R. C. Rollins (1993) did not mention the taxon at any rank. The limited North American material of D. chamissonis that we examined is all from Alaska. The species strongly resembles D. nivalis, from which it is distinguished by having (1 or) 2–7 broadly ovate cauline leaves, proximalmost fruiting pedicels (4–)6–13(–20) mm, petals 1.5–2 mm wide, and fruits 1.1–1.6(–2) mm wide. By contrast, D. nivalis has one ovate or oblong cauline leaf, or none, proximalmost fruiting pedicels 1–4.5(–8) mm, petals 0.8–1.4 mm wide, and fruits 1.5–2.2 mm wide. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
| FNA vol. 7, p. 309. |
FNA vol. 7, p. 300. |
| 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. 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. 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. 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. 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 |
| Braya graminea, D. chrysantha var. graminea, D. chrysantha var. hirticaulis |
D. frigida var. kamtschatica, D. kamtschatica, D. lonchocarpa subsp. kamtschatica, D. nivalis var. kamtschatica |
| Greene: Pl. Baker. 3: 5. (1901) |
G. Don: Gen. Hist. 1: 184. (1831) |
| |
SW CO Wildflowers
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