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Rocky Mountain Draba
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rock Draba, rock whitlow-mustard
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| Perennials; (cespitose); caudex simple or branched (with persistent leaf bases); not scapose. |
Perennials; (sometimes cespitose); caudex simple or branched; 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. |
branched or unbranched, (0.5–)0.7–3(–4.5) dm, pubescent proximally, glabrous or pubescent distally, trichomes sessile (non-crisped), 4- or 5-rayed, stellate, or subpectinate, 0.07–0.4 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; petiolate; petiole base and margin sparsely ciliate, (trichomes simple and 2-rayed, 0.2–0.8 mm); blade oblanceolate to spatulate or linear-oblanceolate, 1–3.8(–5) cm × 2–5(–8) mm, margins dentate or denticulate, surfaces pubescent with sessile, non-crisped, 4- or 5-rayed, stellate trichomes, 0.07–0.5mm, (some rays branched, appearing 2–12-rayed, midvein obscure abaxially). |
(1–)3–9(–12) (as bracts); sessile; blade linear to oblanceolate or lanceolate, margins entire, (ciliate proximally, similar to basal). |
(2 or) 3–10(–13); sessile; blade ovate to oblong, margins dentate to subentire, surfaces pubescent as basal. |
3–15-flowered, bracteate, elongated in fruit; rachis not flexuous, usually pubescent as stem, rarely glabrous. |
5–18(–25)-flowered, ebracteate, elongated in fruit; rachis not flexuous, glabrous or 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 oblong, 1.7–2.5 mm, pubescent, trichomes short-stalked, 3- or 4-rayed; petals white, broadly obovate, 3.5–5 × 1.5–2.5 mm; anthers ovate, 0.4–0.5 mm. |
divaricate-ascending, usually straight, rarely curved upward, 3–10(–15) mm, usually pubescent as stem, rarely glabrous. |
divaricate-ascending to suberect, straight or slightly curved, (3–)4–10(–13) mm, glabrous or 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. |
ovate to lanceolate or linear-lanceolate, usually slightly twisted, rarely plane, flattened, 5–11(–14) × 2–3.5 mm; valves usually glabrous, rarely pubescent, trichomes 3- or 4-rayed, 0.07–0.2 mm; ovules 20–28(–32) per ovary; style (0.2–)0.4–1 mm. |
ovoid, 1.2–1.5 × 0.7–1 mm. |
oblong, 0.8–1.1 × 0.6–0.8 mm. |
= 18. |
= 96. |
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| Flowering Jul–Sep. |
Flowering Jun–Aug. |
| Rocky areas and ridges, alpine tundra, gravel bars in streams |
Rock outcrops and talus (usually limestone or dolomite), open woods, rocky shores |
| 3000-4100 m (9800-13500 ft) |
0-300 m (0-1000 ft) |
|
CO
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ME; MI; MN; NY; VT; WI; MB; NB; NF; NS; ON; QC
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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.) |
Draba arabisans is often confused with D. glabella (2n = 80); it is easily distinguished by having sessile (versus short-stalked) stellate trichomes on abaxial leaf blade surfaces and longer styles (0.2–)0.4–1 [versus 0.1–0.2(–0.4)] mm. Both species have twisted and plane fruits; D. arabisans has mostly twisted fruits; D. glabella has predominantly plane fruits. The complete absence of simple trichomes proximally on stems of D. arabisans can be a useful feature separating it from D. glabella, which often has at least some simple trichomes on the proximal half of the stem. Draba arabis Persoon is an illegitimate name, sometimes found in synonymy with D. arabisans. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
| FNA vol. 7, p. 309. |
FNA vol. 7, p. 291. |
| 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. 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. 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. arabisans var. superiorensis, D. incana var. arabisans, D. incana var. glabriuscula |
| Greene: Pl. Baker. 3: 5. (1901) |
Michaux: Fl. Bor.-Amer. 2: 28. (1803) |
| |
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