FNA: Draba globosa vs. Draba subcapitata

	Draba globosa	Draba subcapitata
	beavertip Draba, rockcress Draba, round-fruit Draba	ellesmereland whitlowgrass
Habit	Perennials; (cespitose, pulvinate); caudex branched (with persistent leaves, branches sometimes terminating in sterile rosettes); scapose.	Perennials; (cespitose, pulvinate); caudex often branched (covered with persistent, thickened petioles, branches sometimes terminating in sterile rosettes); scapose.
Stems	unbranched, 0.1–0.5 dm, glabrous.	unbranched, (0.04–)0.07–0.5(–0.6) dm, usually pubescent throughout, rarely glabrous distally, trichomes simple and 2-rayed, 0.2–0.6 mm, with smaller, dendritic ones.
Basal leaves	rosulate; sessile; blade (not fleshy), narrowly oblanceolate or lanceolate to linear, (0.2–)0.3–0.8 cm × 0.5–1.6(–2) mm, margins entire (ciliate, trichomes simple, 0.1–0.8 mm, apex acute, trichomes usually longer), surfaces glabrous, (midvein obscure abaxially).	(densely imbricate); rosulate; petiolate; petiole margin ciliate, (trichomes simple and 2-rayed, 0.3–0.8 mm); blade oblanceolate to obovate or nearly linear, 0.2–0.8(–1.1) cm × 1–3 mm, margins entire, (pubescent as abaxial surface), surfaces pubescent abaxially, glabrous adaxially, with simple and stalked, 2-rayed trichomes, 0.3–0.8 mm, sometimes with subdendritic ones, 0.1–0.3 mm, (midvein persistent, strongly thickened).
Cauline leaves	0.	0.
Racemes	2–5(–7)-flowered, ebracteate, slightly elongated in fruit; rachis not flexuous, glabrous.	2–8-flowered, ebracteate, (corymbose), slightly elongated in fruit; rachis not flexuous, usually pubescent as stem, (trichomes often crisped), rarely glabrous.
Flowers	sepals (persistent to near fruit maturity), ovate to broadly oblong, 2–3 mm, glabrous; petals white to pale yellow, obovate, 2.5–4 × 1.2–2 mm; anthers oblong, 0.4–0.6 mm.	sepals oblong, 1.2–1.8 mm, pubescent, (trichomes simple); petals white or creamy white, spatulate, 1.5–2(–2.5) × 0.7–1 mm; anthers ovate, 0.2–0.3 mm.
Fruiting pedicels	divaricate-ascending, straight or slightly curved, 2–6 mm, glabrous.	horizontal to divaricate, straight, 1–5(–7) mm, usually pubescent as rachis, rarely glabrous.
Fruits	ovate, plane, flattened, 4.5–8 × 2.5–4 mm; valves (distinctly veined), glabrous; ovules 8–16 per ovary; style (0.1–)0.2–0.6 mm.	ovoid to oblong, plane, slightly inflated, 3.5–6 × 2–3 mm; valves usually glabrous, rarely puberulent, trichomes simple, 0.05–0.15 mm; ovules 14–24 per ovary; style 0.1–0.3 mm.
Seeds	oblong, 1.1–1.4 × 0.8–1 mm.	oblong, 0.9–1.1 × 0.5–0.6 mm.
2n		= 16.

	Draba globosa	Draba subcapitata
Phenology	Flowering Jun–Aug.	Flowering Jul–Aug.
Habitat	Ridges, talus, alpine tundra and meadows	Talus slopes, limestone barrens, peaty bluffs, silty slopes, seepage areas, disturbed gravel
Elevation	2700-3900 m (8900-12800 ft)	0-1000 m (0-3300 ft)
Distribution	ID; MT; UT; WY [WildflowerSearch map] [BONAP county map]	AK; NT; NU; QC; Greenland; Europe (Norway, n Sweden); e Asia (Russian Far East, Siberia) [BONAP county map]
Discussion	Draba globosa is an apomictic species closely related to D. burkei (M. D. Windham, unpubl.). Though often treated as a variety of D. densifolia, it is morphologically and phyletically distinct from that species. Both R. C. Rollins (1993) and N. H. Holmgren (2005b) indicated that the species occurs in Colorado, but we have not seen material for that state. (Discussion copyrighted by Flora of North America; reprinted with permission.)
Source	FNA vol. 7, p. 308.	FNA vol. 7, p. 342.
Parent taxa	Brassicaceae > tribe Arabideae > Draba	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. crassifolia, D. cruciata, D. cuneifolia, D. cusickii, D. cyclomorpha, D. daviesiae, D. densifolia, D. exunguiculata, D. fladnizensis, D. glabella, 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	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. 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. subumbellata, D. trichocarpa, D. ventosa, D. verna, D. viridis, D. weberi, D. yukonensis, D. zionensis
Synonyms	D. apiculata, D. densifolia var. apiculata, D. densifolia var. decipiens, D. densifolia var. globosa
Name authority	Payson: Amer. J. Bot. 4: 257. (1917)	Simmons: Vasc. Pl. Fl. Ellesmereland, 87, fig. 3, plate 1, figs. 3–8. (1906)
Web links	Local Web sites: PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Draba subcapitata

beavertip Draba, rockcress Draba, round-fruit Draba

ellesmereland whitlowgrass

Habit

Perennials; (cespitose, pulvinate); caudex branched (with persistent leaves, branches sometimes terminating in sterile rosettes); scapose.

Perennials; (cespitose, pulvinate); caudex often branched (covered with persistent, thickened petioles, branches sometimes terminating in sterile rosettes); scapose.

Stems

unbranched, 0.1–0.5 dm, glabrous.

unbranched, (0.04–)0.07–0.5(–0.6) dm, usually pubescent throughout, rarely glabrous distally, trichomes simple and 2-rayed, 0.2–0.6 mm, with smaller, dendritic ones.

Basal leaves

rosulate;

sessile;

blade (not fleshy), narrowly oblanceolate or lanceolate to linear, (0.2–)0.3–0.8 cm × 0.5–1.6(–2) mm, margins entire (ciliate, trichomes simple, 0.1–0.8 mm, apex acute, trichomes usually longer), surfaces glabrous, (midvein obscure abaxially).

(densely imbricate); rosulate; petiolate;

petiole margin ciliate, (trichomes simple and 2-rayed, 0.3–0.8 mm);

blade oblanceolate to obovate or nearly linear, 0.2–0.8(–1.1) cm × 1–3 mm, margins entire, (pubescent as abaxial surface), surfaces pubescent abaxially, glabrous adaxially, with simple and stalked, 2-rayed trichomes, 0.3–0.8 mm, sometimes with subdendritic ones, 0.1–0.3 mm, (midvein persistent, strongly thickened).

Cauline leaves

Racemes

2–5(–7)-flowered, ebracteate, slightly elongated in fruit;

rachis not flexuous, glabrous.

2–8-flowered, ebracteate, (corymbose), slightly elongated in fruit;

rachis not flexuous, usually pubescent as stem, (trichomes often crisped), rarely glabrous.

Flowers

sepals (persistent to near fruit maturity), ovate to broadly oblong, 2–3 mm, glabrous;

petals white to pale yellow, obovate, 2.5–4 × 1.2–2 mm;

anthers oblong, 0.4–0.6 mm.

sepals oblong, 1.2–1.8 mm, pubescent, (trichomes simple);

petals white or creamy white, spatulate, 1.5–2(–2.5) × 0.7–1 mm;

anthers ovate, 0.2–0.3 mm.

Fruiting pedicels

divaricate-ascending, straight or slightly curved, 2–6 mm, glabrous.

horizontal to divaricate, straight, 1–5(–7) mm, usually pubescent as rachis, rarely glabrous.

Fruits

ovate, plane, flattened, 4.5–8 × 2.5–4 mm;

valves (distinctly veined), glabrous;

ovules 8–16 per ovary;

style (0.1–)0.2–0.6 mm.

ovoid to oblong, plane, slightly inflated, 3.5–6 × 2–3 mm;

valves usually glabrous, rarely puberulent, trichomes simple, 0.05–0.15 mm;

ovules 14–24 per ovary;

style 0.1–0.3 mm.

Seeds

oblong, 1.1–1.4 × 0.8–1 mm.

oblong, 0.9–1.1 × 0.5–0.6 mm.

= 16.

Draba globosa

Draba subcapitata

Phenology

Flowering Jun–Aug.

Flowering Jul–Aug.

Habitat

Ridges, talus, alpine tundra and meadows

Talus slopes, limestone barrens, peaty bluffs, silty slopes, seepage areas, disturbed gravel

Elevation

2700-3900 m (8900-12800 ft)

0-1000 m (0-3300 ft)

Distribution

ID; MT; UT; WY

[WildflowerSearch map]

[BONAP county map]

AK; NT; NU; QC; Greenland; Europe (Norway, n Sweden); e Asia (Russian Far East, Siberia)

[BONAP county map]

Discussion

Draba globosa is an apomictic species closely related to D. burkei (M. D. Windham, unpubl.). Though often treated as a variety of D. densifolia, it is morphologically and phyletically distinct from that species. Both R. C. Rollins (1993) and N. H. Holmgren (2005b) indicated that the species occurs in Colorado, but we have not seen material for that state.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source

FNA vol. 7, p. 308.

FNA vol. 7, p. 342.

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. crassifolia, D. cruciata, D. cuneifolia, D. cusickii, D. cyclomorpha, D. daviesiae, D. densifolia, D. exunguiculata, D. fladnizensis, D. glabella, 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

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. 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. subumbellata, D. trichocarpa, D. ventosa, D. verna, D. viridis, D. weberi, D. yukonensis, D. zionensis

Synonyms

D. apiculata, D. densifolia var. apiculata, D. densifolia var. decipiens, D. densifolia var. globosa

Name authority

Payson: Amer. J. Bot. 4: 257. (1917)

Simmons: Vasc. Pl. Fl. Ellesmereland, 87, fig. 3, plate 1, figs. 3–8. (1906)

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).

Choose a data source: Flora of North America

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Flora of North America species comparison

Draba globosa

Draba subcapitata

Draba globosa

Draba subcapitata