Flora of North America species comparison

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Draba exunguiculata

Brassicaceae tribe Arabideae

clawless Draba
Habit Perennials; (densely cespitose); caudex branched (covered with persistent, somewhat thickened, dry petioles); not scapose. Annuals, biennials, or perennials [subshrubs]; eglandular.
Stems

unbranched, 0.15–0.7 dm, glabrous throughout or sparsely pubescent, trichomes simple, 0.3–0.9 mm.

Basal leaves

rosulate;

petiolate;

petiole ciliate, (trichomes simple, 0.3–1.1 mm);

blade linear to linear-oblanceolate, (0.5–)0.8–2(–2.5) cm × 1–3 mm, margins entire, (pubescent as petiole), surfaces abaxially sparsely pubescent with simple and stalked, 2- or 3-rayed trichomes, 0.1–0.4 mm, adaxially glabrous or subapically sparsely pubescent with simple trichomes.

Cauline leaves

1–4;

sessile;

blade linear to linear-oblanceolate, margins entire, surfaces pubescent as basal.

petiolate or sessile;

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

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

4–13(–20)-flowered, ebracteate, elongated in fruit;

rachis not flexuous, usually glabrous, rarely sparsely pubescent, trichomes simple, to 1 mm.

usually ebracteate, often elongated in fruit.
Flowers

sepals ovate, 2–2.5 mm, pubescent, (trichomes simple);

petals (erect), yellow, obovate, 2–2.5(–3) × 1.5–2 mm, (not clawed);

anthers oblong, 0.6–0.9 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, straight or slightly curved upward, 1–6 mm, usually glabrous, rarely with few, simple trichomes.

Fruits

lanceolate to oblong-lanceolate, plane, flattened, 5–13 × 1.5–3 mm;

valves glabrous;

ovules 20–24 per ovary;

style 0.3–1 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, 1–1.3 × 0.6–0.8 mm.

biseriate or uniseriate [rarely aseriate];

cotyledons accumbent.
2n

= 56 ± 5.

Draba exunguiculata

Brassicaceae tribe Arabideae
Phenology Flowering Jul–Aug.
Habitat Open knolls, talus, gravelly alpine slopes, rocky alpine tundra
Elevation 3600-4300 m (11800-14100 ft)
Distribution
from FNA
CO
[BONAP county map]
North America; Mexico; South America; Europe; Asia; n Africa
Discussion

Of conservation concern.

Draba exunguiculata occupies alpine areas of Clear Creek, El Paso, Grand, and Summit counties in central Colorado. Draba grayana is found in the same general area; both species are apomicts that occasionally grow sympatrically. Draba exunguiculata is easily distinguished from D. grayana by having stems and fruiting pedicels glabrous or sparsely pubescent with simple trichomes (versus moderately to densely pubescent with simple and 2- or 3-rayed trichomes), and by having erect, non-clawed petals, 2–3 mm and slightly longer than sepals (versus flared, clawed petals 3–4.5 mm and nearly twice as long as sepals).

(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. 306. 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. 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
Subordinate taxa
Synonyms D. chrysantha var. exunguiculata, D. chrysantha
Name authority (O. E. Schulz) C. L. Hitchcock: Revis. Drabas W. N. Amer., 46. (1941) 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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