FNA: Draba sibirica vs. Brassicaceae tribe Arabideae

	Draba sibirica	Brassicaceae tribe Arabideae
	Siberian whitlowgrass
Habit	Perennials; (stoloniferous); caudex branched (sparsely covered with persistent petiole remains, branches slender, creeping); scapose.	Annuals, biennials, or perennials [subshrubs]; eglandular.
Stems	(subdecumbent when sterile), unbranched, 0.5–2.5 dm, sparsely to densely hispid, trichomes malpighiaceous, (flowering scapes sparsely pilose proximally with simple trichomes, often glabrous on distal 1/2).
Basal leaves	rosulate; petiolate; blade oblong-lanceolate or oblanceolate, 0.4–2.2 cm × 1–5(–10) mm, margins entire, surfaces often pubescent, sometimes glabrous (except margins), with appressed, malpighiaceous trichomes (these sometimes with 1 or 2 shorter, lateral branches, appearing 3-fid or cross-shaped).
Cauline leaves	0.	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	7–20-flowered, ebracteate, considerably elongated in fruit; rachis not flexuous (straight), glabrous.	usually ebracteate, often elongated in fruit.
Flowers	sepals (erect), oblong or ovate, 2–2.7 mm (lateral pair subsaccate basally), glabrous or abaxially sparsely pilose, (trichomes simple); petals yellow, narrowly obovate, 4–6 × 2–3 mm, (apex emarginate); anthers ovate-subcordate, 0.4–0.5 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, straight or curved, (often filiform), 5–18(–23) mm, glabrous.
Fruits	usually oblong to elliptic, rarely sublinear, plane, flattened, 4–8 × 1.5–2.2 mm; valves glabrous, (obscurely veined); ovules 24–30 per ovary; style 0.5–1 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	(brown), ovoid, 0.9–1.2 × 0.5–0.6 mm.	biseriate or uniseriate [rarely aseriate]; cotyledons accumbent.
2n	= 16.

	Draba sibirica	Brassicaceae tribe Arabideae
Phenology	Flowering May–Jul.
Habitat	Wet places on rocky slopes
Elevation	0-300 m (0-1000 ft)
Distribution	Greenland; Europe (Russia); Asia (Caucasus, Iran, Russian Far East, Siberia, Turkey, central republics) [BONAP county map]	North America; Mexico; South America; Europe; Asia; n Africa
Discussion	Draba sibirica is one of three species of the genus in North America exhibiting malpighiaceous trichomes. It is easily distinguished from others (D. malpighiacea and some plants of D. spectabilis) by a complete absence of cauline leaves. It is found in the flora area in northeastern Greenland. (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. 337.	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. 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. 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	Lepidium sibiricum, D. gmelinii, D. repens, D. sibirica subsp. arctica
Name authority	(Pallas) Thellung: Neue Denkschr. Schweiz. Naturf. Ges. 41: 318. (1907)	de Candolle: Mém. Mus. Hist. Nat. 7: 229. (1821)
Web links	WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Google search

Brassicaceae tribe Arabideae

Siberian whitlowgrass

Habit

Perennials; (stoloniferous); caudex branched (sparsely covered with persistent petiole remains, branches slender, creeping); scapose.

Annuals, biennials, or perennials [subshrubs]; eglandular.

Stems

(subdecumbent when sterile), unbranched, 0.5–2.5 dm, sparsely to densely hispid, trichomes malpighiaceous, (flowering scapes sparsely pilose proximally with simple trichomes, often glabrous on distal 1/2).

Basal leaves

rosulate;

petiolate;

blade oblong-lanceolate or oblanceolate, 0.4–2.2 cm × 1–5(–10) mm, margins entire, surfaces often pubescent, sometimes glabrous (except margins), with appressed, malpighiaceous trichomes (these sometimes with 1 or 2 shorter, lateral branches, appearing 3-fid or cross-shaped).

Cauline leaves

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

7–20-flowered, ebracteate, considerably elongated in fruit;

rachis not flexuous (straight), glabrous.

usually ebracteate, often elongated in fruit.

Flowers

sepals (erect), oblong or ovate, 2–2.7 mm (lateral pair subsaccate basally), glabrous or abaxially sparsely pilose, (trichomes simple);

petals yellow, narrowly obovate, 4–6 × 2–3 mm, (apex emarginate);

anthers ovate-subcordate, 0.4–0.5 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, straight or curved, (often filiform), 5–18(–23) mm, glabrous.

Fruits

usually oblong to elliptic, rarely sublinear, plane, flattened, 4–8 × 1.5–2.2 mm;

valves glabrous, (obscurely veined);

ovules 24–30 per ovary;

style 0.5–1 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

(brown), ovoid, 0.9–1.2 × 0.5–0.6 mm.

biseriate or uniseriate [rarely aseriate];

cotyledons accumbent.

= 16.

Draba sibirica

Brassicaceae tribe Arabideae

Phenology

Flowering May–Jul.

Habitat

Wet places on rocky slopes

Elevation

0-300 m (0-1000 ft)

Distribution

Greenland; Europe (Russia); Asia (Caucasus, Iran, Russian Far East, Siberia, Turkey, central republics)

[BONAP county map]

North America; Mexico; South America; Europe; Asia; n Africa

Discussion

Draba sibirica is one of three species of the genus in North America exhibiting malpighiaceous trichomes. It is easily distinguished from others (D. malpighiacea and some plants of D. spectabilis) by a complete absence of cauline leaves. It is found in the flora area in northeastern Greenland.

(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. 337.

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. 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. 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

Lepidium sibiricum, D. gmelinii, D. repens, D. sibirica subsp. arctica

Name authority

(Pallas) Thellung: Neue Denkschr. Schweiz. Naturf. Ges. 41: 318. (1907)

de Candolle: Mém. Mus. Hist. Nat. 7: 229. (1821)

Web links

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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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Draba sibirica

Brassicaceae tribe Arabideae

Draba sibirica

Brassicaceae tribe Arabideae