Flora of North America species comparison

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Draba graminea

Brassicaceae tribe Arabideae

Rocky Mountain Draba
Habit Perennials; (cespitose); caudex simple or branched (with persistent leaf bases); not scapose. Annuals, biennials, or perennials [subshrubs]; eglandular.
Stems

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.

Basal leaves

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.

Cauline leaves

(1–)3–9(–12) (as bracts);

sessile;

blade linear to oblanceolate or lanceolate, margins entire, (ciliate proximally, similar to basal).

petiolate or sessile;

blade base auriculate or not, margins entire or dentate.
Racemes

3–15-flowered, bracteate, elongated in fruit;

rachis not flexuous, usually pubescent as stem, rarely glabrous.

usually ebracteate, often elongated in fruit.
Flowers

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.

actinomorphic;

sepals erect, ascending, or spreading, lateral pair seldom saccate basally;

petals white, yellow, orange, pink, or purple, claw usually present, usually distinct;

filaments unappendaged, not winged;

pollen 3-colpate.
Fruiting pedicels

divaricate-ascending, usually straight, rarely curved upward, 3–10(–15) mm, usually pubescent as stem, rarely glabrous.

Fruits

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.

silicles or siliques, usually dehiscent, very rarely indehiscent, unsegmented, latiseptate or terete;

ovules 2–70(–88)[–110+] per ovary;

style usually distinct, sometimes obsolete;

stigma usually entire, rarely 2-lobed.
Seeds

ovoid, 1.2–1.5 × 0.7–1 mm.

biseriate or uniseriate [rarely aseriate];

cotyledons accumbent.
Trichomes

stalked or sessile, usually stellate, dendritic, cruciform, or forked, sometimes mixed with simple ones, rarely malpighiaceous.
2n

= 18.

Draba graminea

Brassicaceae tribe Arabideae
Phenology Flowering Jul–Sep.
Habitat Rocky areas and ridges, alpine tundra, gravel bars in streams
Elevation 3000-4100 m (9800-13500 ft)
Distribution
from FNA
CO
[WildflowerSearch map]
[BONAP county map]
North America; Mexico; South America; Europe; Asia; n Africa
Discussion

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.)

Genera 8, species ca. 460 (4 genera, 139 species in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 7, p. 309. FNA vol. 7, p. 256.
Parent taxa Brassicaceae > tribe Arabideae > Draba Brassicaceae
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. 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
Subordinate taxa
Synonyms Braya graminea, D. chrysantha var. graminea, D. chrysantha var. hirticaulis
Name authority Greene: Pl. Baker. 3: 5. (1901) de Candolle: Mém. Mus. Hist. Nat. 7: 229. (1821)
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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