Flora of North America species comparison

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Draba crassifolia

Rocky Mountain Draba, Rocky Mountain whitlow-grass, snowbed Draba, snowbed whitlow-grass, thick-leaf Draba
Habit Annuals or perennials; (short-lived); caudex branched (when present); usually scapose.
Stems

unbranched or, rarely, branched distally, (0.1–)0.3–1.1(–1.5) dm, usually glabrous throughout, rarely pubescent proximally, trichomes simple, 0.3–0.7 mm.
Basal leaves

rosulate; petiolate;

petiole ciliate throughout;

blade oblanceolate to obovate, (0.2–) 0.5–2.5(–3) cm × (1–)2–4(–6) mm, margins usually entire, rarely denticulate, (sometimes ciliate), surfaces glabrous or sparsely pubescent, with simple and 2-rayed trichomes, 0.3–0.9 mm.
Cauline leaves

usually 0, rarely 1;

sessile;

blade oblong to ovate, margins entire, surfaces glabrous.
Racemes

(2–)4–15(–25)-flowered, ebracteate, elongated in fruit;

rachis slightly flexuous or straight, glabrous.
Flowers

(chasmogamous, petaliferous);

sepals (green or purplish), ovate, 1–2 mm, glabrous;

petals yellow (often fading white), oblanceolate, 1.5–2.5(–3) × 0.5–1 mm;

anthers ovate, 0.15–0.25 mm.
Fruiting pedicels

horizontal to divaricate-ascending, usually straight, rarely curved upward, 3–8(–10) mm (subequaling or shorter than fruit), glabrous.
Fruits

usually narrowly elliptic to lanceolate, rarely linear-lanceolate, plane, flattened, (3–)5–10 × 1.5–2.5 mm;

valves glabrous;

ovules (8–)16–24(–30) per ovary;

style 0.02–0.1 mm.
Seeds

elliptic, 0.7–0.8 × 0.4–0.5 mm.
2n

= 40.

Draba crassifolia
Phenology Flowering Jun–Sep.
Habitat Rock outcrops and talus, subalpine meadows, alpine summits and tundra, bare snow-melt areas
Elevation (50-)1000-4300 m ((200-)3300-14100 ft)
Distribution
from FNA
AK; AZ; CO; ID; MT; NM; NV; UT; WA; WY; AB; BC; LB; NT; NU; QC; YT; Greenland; n Europe (Norway, Sweden)
[WildflowerSearch map]
[BONAP county map]
Discussion

M. D. Windham (2004) presented morphological and chromosomal data suggesting that Draba crassifolia is an allopolyploid produced by hybridization between D. albertina and D. fladnizensis. Although the species is distinctive in large part, some individuals can be difficult to place and there is evidence of rare backcrossing (Windham, unpubl.). The attribution to Arizona is based on Schaack 345 (US) and Kearney & Peebles 12156 (US), both collected on the San Francisco Peaks in Coconino County. Draba crassifolia is found at elevations as low as 50 m in Greenland and the islands of Nunavut.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 302.
Parent taxa Brassicaceae > tribe Arabideae > Draba
Sibling taxa
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. 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
Synonyms D. crassifolia var. parryi, D. parryi
Name authority Graham: Edinburgh New Philos. J. 7: 182. (1829)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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