FNA: Draba globosa vs. Draba pterosperma

	Draba globosa	Draba pterosperma
	beavertip Draba, rockcress Draba, round-fruit Draba	wing-seed Draba, wingedseed Draba
Habit	Perennials; (cespitose, pulvinate); caudex branched (with persistent leaves, branches sometimes terminating in sterile rosettes); scapose.	Perennials; (densely cespitose to pulvinate); caudex branched (with persistent leaves, branches sometimes terminating in sterile rosettes); scapose.
Stems	unbranched, 0.1–0.5 dm, glabrous.	unbranched, 0.3–1.1 dm, pubescent throughout, trichomes sub-dendritic, 2–7-rayed, (often crisped), 0.2–0.7 mm.
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 base and margin ciliate, (trichomes simple or branched, often crisped, 0.3–1 mm); blade oblanceolate to obovate or spatulate, 0.2–0.7 cm × 1–2.8 mm, margins entire, surfaces densely pubescent (often grayish) with stellate-dendritic, stalked, 5–12-rayed, (often crisped) trichomes, 0.2–0.6 mm.
Cauline leaves	0.	0.
Racemes	2–5(–7)-flowered, ebracteate, slightly elongated in fruit; rachis not flexuous, glabrous.	4–12-flowered, ebracteate, elongated in fruit; rachis not flexuous, pubescent as stem.
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, 3–4 mm, pubescent, (trichomes stalked, branched, crisped); petals yellow, oblanceolate, 6–7 × 1.5–2.5 mm; anthers oblong, 0.7–0.9 mm.
Fruiting pedicels	divaricate-ascending, straight or slightly curved, 2–6 mm, glabrous.	erect (and subappressed to rachis) or ascending, straight, (3–)4–9(–12) mm, pubescent as stem.
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.	broadly ovate to lanceolate or subelliptic, plane, flattened, 5–10(–13) × (2.5–)3.5–5(–6) mm; valves pubescent, trichomes short stalked, 2–7-rayed, (straight or crisped), 0.15–0.6 mm; ovules 8–12 per ovary; style 1.5–3(–3.8) mm.
Seeds	oblong, 1.1–1.4 × 0.8–1 mm.	(winged), ovate, 1.6–3 × 1.3–1.8 mm; (wing 0.3–0.9 mm wide).

	Draba globosa	Draba pterosperma
Phenology	Flowering Jun–Aug.	Flowering Jun–Sep.
Habitat	Ridges, talus, alpine tundra and meadows	Limestone and marble outcrops, talus, gravel slopes
Elevation	2700-3900 m (8900-12800 ft)	1500-2500 m (4900-8200 ft)
Distribution	ID; MT; UT; WY [WildflowerSearch map] [BONAP county map]	CA [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.)	Draba pterosperma is a distinctive species that is restricted to the Marble Mountains of northern California (Siskiyou County). (Discussion copyrighted by Flora of North America; reprinted with permission.)
Source	FNA vol. 7, p. 308.	FNA vol. 7, p. 332.
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. 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
Synonyms	D. apiculata, D. densifolia var. apiculata, D. densifolia var. decipiens, D. densifolia var. globosa
Name authority	Payson: Amer. J. Bot. 4: 257. (1917)	Payson: Amer. J. Bot. 4: 266. (1917)
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	Local floras: CA Local Web sites: CalFlora, CalPhotos WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Draba pterosperma

beavertip Draba, rockcress Draba, round-fruit Draba

wing-seed Draba, wingedseed Draba

Habit

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

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

Stems

unbranched, 0.1–0.5 dm, glabrous.

unbranched, 0.3–1.1 dm, pubescent throughout, trichomes sub-dendritic, 2–7-rayed, (often crisped), 0.2–0.7 mm.

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 base and margin ciliate, (trichomes simple or branched, often crisped, 0.3–1 mm);

blade oblanceolate to obovate or spatulate, 0.2–0.7 cm × 1–2.8 mm, margins entire, surfaces densely pubescent (often grayish) with stellate-dendritic, stalked, 5–12-rayed, (often crisped) trichomes, 0.2–0.6 mm.

Cauline leaves

Racemes

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

rachis not flexuous, glabrous.

4–12-flowered, ebracteate, elongated in fruit;

rachis not flexuous, pubescent as stem.

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, 3–4 mm, pubescent, (trichomes stalked, branched, crisped);

petals yellow, oblanceolate, 6–7 × 1.5–2.5 mm;

anthers oblong, 0.7–0.9 mm.

Fruiting pedicels

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

erect (and subappressed to rachis) or ascending, straight, (3–)4–9(–12) mm, pubescent as stem.

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.

broadly ovate to lanceolate or subelliptic, plane, flattened, 5–10(–13) × (2.5–)3.5–5(–6) mm;

valves pubescent, trichomes short stalked, 2–7-rayed, (straight or crisped), 0.15–0.6 mm;

ovules 8–12 per ovary;

style 1.5–3(–3.8) mm.

Seeds

oblong, 1.1–1.4 × 0.8–1 mm.

(winged), ovate, 1.6–3 × 1.3–1.8 mm; (wing 0.3–0.9 mm wide).

Draba globosa

Draba pterosperma

Phenology

Flowering Jun–Aug.

Flowering Jun–Sep.

Habitat

Ridges, talus, alpine tundra and meadows

Limestone and marble outcrops, talus, gravel slopes

Elevation

2700-3900 m (8900-12800 ft)

1500-2500 m (4900-8200 ft)

Distribution

ID; MT; UT; WY

[WildflowerSearch map]

[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.)

Draba pterosperma is a distinctive species that is restricted to the Marble Mountains of northern California (Siskiyou County).

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

Source

FNA vol. 7, p. 308.

FNA vol. 7, p. 332.

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. 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

Synonyms

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

Name authority

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

Payson: Amer. J. Bot. 4: 266. (1917)

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 pterosperma

Draba globosa

Draba pterosperma