Draba cana
Draba smithii
Brewer's Draba, canescent Draba, canescent whitlow-mustard, cushion Draba, hoary Draba, hoary whitlow-grass, lance-leaf Draba, lance-leaf whitlow-grass
Smith's Draba
unbranched or branched distally, (0.6–)1–3(–3.8) dm, pubescent throughout, trichomes simple, 0.5–1mm, with 4–10-rayed ones, 0.05–0.2 mm (mostly branched on basal parts).
usually unbranched, (0.5–)1–2.4(–3) dm, pubescent throughout, trichomes short-stalked, subdendritic, 4–12-rayed, 0.05–0.2 mm.
rosulate; petiolate;
petiole ciliate throughout;
blade linear to oblanceolate or oblong, (0.5–)0.8–2(–3.5) cm × 1.5–4(–11) mm, margins entire or dentate, (base and apex ciliate, trichomes simple, 0.3–0.8 mm), surfaces pubescent with short-stalked, 4–12-rayed trichomes, 0.1–0.3 mm.
rosulate;
petiole (obscure), usually not ciliate, rarely pubescent proximally, (trichomes simple or spurred, to 0.25 mm);
blade obovate to narrowly oblanceolate, 0.5–1.3(–2.5) cm × (1–)2–4(–7) mm, margins usually entire, rarely denticulate, surfaces pubescent with short-stalked, subdendritic, 5–12-rayed trichomes, 0.05–0.3 mm.
3–10(–17), (not overlapping);
sessile;
blade lanceolate to ovate or oblong, margins entire or dentate, surfaces pubescent as basal (adaxially with simple and forked trichomes near blade base).
(2 or) 3–8;
sessile;
blade oblong to lanceolate, margins usually entire, rarely denticulate, surfaces pubescent as basal, or, rarely, adaxially with long-stalked, 2–5-rayed trichomes.
(10–)15–47(–63)-flowered, basally bracteate, often considerably elongated in fruit;
rachis not flexuous, densely pubescent, trichomes 4–10-rayed (0.05–0.2 mm), and fewer simple ones.
12–28-flowered, ebracteate, elongated in fruit;
rachis not flexuous, pubescent as stem.
sepals (green or lavender), oblong to ovate, 1.5–2 mm, pubescent, (trichomes simple and few-rayed);
petals white, oblanceolate to spatulate, 2.3–3.7(–4.5) × 0.7–1.7 mm;
anthers ovate, 0.1–0.2 mm.
sepals ovate, 2–2.5 mm, pubescent;
petals white, spatulate, 4–6 × 2–3 mm;
anthers ovate, 0.5–0.6 mm.
suberect or ascending, straight, 2–5(–10) mm, pubescent as rachis.
divaricate, straight, (3–)5–10(–13) mm, pubescent as stem.
(subappressed to rachis), linear-lanceolate to linear or, rarely, ovate-oblong, slightly twisted or plane, flattened, (5–)6–11 × 1.5–2(–2.5) mm;
valves pubescent, trichomes short-stalked, 3–7-rayed, 0.05–0.3 mm;
ovules 28–48 per ovary;
style 0.1–0.6 mm.
ovate-lanceolate, twisted, flattened, 5–9 × 2–3 mm;
valves pubescent, trichomes simple and short-stalked, 2–4-rayed, 0.05–0.2 mm;
ovules 16–20 per ovary;
style (0.7–)1–2(–2.3) mm.
ovoid, 0.5–0.7(–0.9) × 0.3–0.5 mm.
oblong, 0.8–1.2 × 0.5–0.7 mm.
= 32.
= 32.
Draba cana
Draba smithii
The limits of Draba cana have long been confused, and the species was treated as a synonym of the Himalayan D. lanceolata Royle (M. L. Fernald 1934; C. L. Hitchcock 1941) or as a variety of the western North American D. breweri (R. C. Rollins 1993). However, G. A. Mulligan (1971) clearly demonstrated that all three are distinct and should be maintained. Some Utah plants corresponding to the type of D. valida have shorter and wider oblong-ovate fruits. In all other aspects, they are indistinguishable from D. cana. Additional studies are needed to establish whether such plants should be formally recognized.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Of conservation concern.
Draba smithii is a distinctive species known only from Archuleta, Las Animas, and Mineral counties in southern Colorado.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
- Local floras:
BC, 
CA, 
OR, 
WA - Local Web sites: CalFlora, CalPhotos,
Flora NW, 
Go Botany, 
MI Flora, 
PNW Herbaria, 
SW CO Wildflowers 
WildflowerSearch
iNaturalist (observations)
USDA Plants Database- LBJ Wildflower Center
- SEINet
- Plants of the World Online
- Encyclopedia of Life
- Wikipedia
- Google Image Search
