FNA: Draba abajoensis vs. Draba scotteri

	Draba abajoensis	Draba scotteri
		scotter's whitlowgrass
Habit	Perennials; caudex simple or branched, (sometimes with persistent leaf bases); not scapose.	Perennials; (cespitose); caudex simple or branched (covered with persistent leaves); scapose.
Stems	unbranched, (0.6–)1–2.5(–3.5) dm, pubescent proximally, usually glabrous distally, rarely sparsely pubescent, trichomes simple, 0.1–0.5 mm, often with stalked, 2(–4)-rayed ones.	unbranched, 0.2–1.4 dm, pubescent throughout, trichomes 2–8-rayed, 0.07–0.4 mm, and, sometimes, simple ones, 0.2–0.8 mm.
Basal leaves	rosulate; petiolate; petiole (0.2–1(–2) cm), proximal margin ciliate, (trichomes simple, 0.2–0.7 mm); blade oblanceolate to spatulate, (0.6–)1–3.5(–4.3) cm × (2–)4–10(–14) mm, margins entire or dentate, surfaces pubescent with short-stalked, (2–)4-rayed trichomes, 0.05–0.35 mm, sometimes adaxially with simple ones.	rosulate; petiolate; petiole base ciliate, (trichomes simple, 0.2–1 mm); blade oblanceolate, 0.4–1.5 cm × 1–3 mm, margins entire, (ciliate as petiole base), surfaces pubescent with short-stalked, stellate, 8–12-rayed trichomes, 0.1–0.4 mm.
Cauline leaves	(3–)5–9(–11); sessile; blade broadly ovate to lanceolate or oblong, margins entire or dentate, surfaces pubescent as basal or adaxially also with mostly simple trichomes.	0.
Racemes	(11–)15–32(–47)-flowered, ebracteate, elongated in fruit; rachis not flexuous, glabrous or pubescent, trichomes simple and short-stalked, 2–4-rayed.	1–9-flowered, usually ebracteate, rarely proximalmost flower subtended by a tiny bract, usually considerably elongated in fruit; rachis not flexuous, pubescent as stem.
Flowers	sepals ovate-oblong, 2.2–3.5 mm, subapically sparsely pubescent, (trichomes simple, short-stalked, and 2-rayed); petals yellow, oblanceolate, 4–6 × 1.5–2 mm; anthers oblong, 0.6–1 mm.	sepals oblong, 2–3 mm, subapically pubescent, (trichomes simple); petals yellow, obovate to spatulate, 3.5–5.5 × 1.5–2.5 mm; anthers ovate, 0.4–0.5 mm.
Fruiting pedicels	horizontal to divaricate-ascending, straight or curved, (5–)7–18(–23) mm, glabrous or sparsely pubescent abaxially, trichomes simple and 2-rayed.	divaricate-ascending, straight, 3–8(–12) mm, pubescent as stem.
Fruits	elliptic to elliptic-lanceolate, plane, flattened, 5–9(–12) × 2–3 mm; valves glabrous; ovules 10–18 per ovary; style (0.8–)1.4–2.7(–3.6) mm.	lanceolate to narrowly so, plane, flattened, 5–11 × 1.5–2.5 mm; valves pubescent, trichomes simple, 0.1–0.4 mm, occasionally with some 2-rayed ones; ovules 12–18 per ovary; style 0.3–1 mm.
Seeds	ovoid, 1–1.2 × 0.7–0.8 mm.	ovoid, 0.8–1.2 × 0.6–0.7 mm.
2n	= 20.	= 96.

	Draba abajoensis	Draba scotteri
Phenology	Flowering May–Aug.	Flowering Jun–Jul.
Habitat	Spruce, fir, or pine forests, subalpine meadows	Talus and gravelly summits in alpine communities
Elevation	1900-3800 m (6200-12500 ft)	1200-2000 m (3900-6600 ft)
Distribution	AZ; NM; UT [BONAP county map]	YT [BONAP county map]
Discussion	Plants of Draba abajoensis were treated by C. L. Hitchcock (1941), R. C. Rollins (1993), and N. H. Holmgren (2005b) as D. spectabilis. The differences between these taxa in chromosome number and trichome morphology strongly support their recognition as separate species (I. A. Al-Shehbaz and M. D. Windham 2007). Draba abajoensis has been collected from the Chuska and Lukachukai mountains in Apache County, Arizona, Chuska Mountains in San Juan County, New Mexico, and Abajo and La Sal mountains in San Juan and Grand counties, Utah. (Discussion copyrighted by Flora of North America; reprinted with permission.)	Of conservation concern. The description of Draba scotteri is based on collections from Kluane National Park, southwestern Yukon Territory. (Discussion copyrighted by Flora of North America; reprinted with permission.)
Source	FNA vol. 7, p. 288.	FNA vol. 7, p. 335.
Parent taxa	Brassicaceae > tribe Arabideae > Draba	Brassicaceae > tribe Arabideae > Draba
Sibling taxa	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. 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. 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. spectabilis var. glabrescens
Name authority	Windham & Al-Shehbaz: Harvard Pap. Bot. 12: 416. (2007)	G. A. Mulligan: Canad. J. Bot. 57: 1874. (1979)
Web links	WildflowerSearch iNaturalist (observations) LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC 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

Draba scotteri

scotter's whitlowgrass

Habit

Perennials; caudex simple or branched, (sometimes with persistent leaf bases); not scapose.

Perennials; (cespitose); caudex simple or branched (covered with persistent leaves); scapose.

Stems

unbranched, (0.6–)1–2.5(–3.5) dm, pubescent proximally, usually glabrous distally, rarely sparsely pubescent, trichomes simple, 0.1–0.5 mm, often with stalked, 2(–4)-rayed ones.

unbranched, 0.2–1.4 dm, pubescent throughout, trichomes 2–8-rayed, 0.07–0.4 mm, and, sometimes, simple ones, 0.2–0.8 mm.

Basal leaves

rosulate;

petiolate;

petiole (0.2–1(–2) cm), proximal margin ciliate, (trichomes simple, 0.2–0.7 mm);

blade oblanceolate to spatulate, (0.6–)1–3.5(–4.3) cm × (2–)4–10(–14) mm, margins entire or dentate, surfaces pubescent with short-stalked, (2–)4-rayed trichomes, 0.05–0.35 mm, sometimes adaxially with simple ones.

rosulate;

petiolate;

petiole base ciliate, (trichomes simple, 0.2–1 mm);

blade oblanceolate, 0.4–1.5 cm × 1–3 mm, margins entire, (ciliate as petiole base), surfaces pubescent with short-stalked, stellate, 8–12-rayed trichomes, 0.1–0.4 mm.

Cauline leaves

(3–)5–9(–11);

sessile;

blade broadly ovate to lanceolate or oblong, margins entire or dentate, surfaces pubescent as basal or adaxially also with mostly simple trichomes.

Racemes

(11–)15–32(–47)-flowered, ebracteate, elongated in fruit;

rachis not flexuous, glabrous or pubescent, trichomes simple and short-stalked, 2–4-rayed.

1–9-flowered, usually ebracteate, rarely proximalmost flower subtended by a tiny bract, usually considerably elongated in fruit;

rachis not flexuous, pubescent as stem.

Flowers

sepals ovate-oblong, 2.2–3.5 mm, subapically sparsely pubescent, (trichomes simple, short-stalked, and 2-rayed);

petals yellow, oblanceolate, 4–6 × 1.5–2 mm;

anthers oblong, 0.6–1 mm.

sepals oblong, 2–3 mm, subapically pubescent, (trichomes simple);

petals yellow, obovate to spatulate, 3.5–5.5 × 1.5–2.5 mm;

anthers ovate, 0.4–0.5 mm.

Fruiting pedicels

horizontal to divaricate-ascending, straight or curved, (5–)7–18(–23) mm, glabrous or sparsely pubescent abaxially, trichomes simple and 2-rayed.

divaricate-ascending, straight, 3–8(–12) mm, pubescent as stem.

Fruits

elliptic to elliptic-lanceolate, plane, flattened, 5–9(–12) × 2–3 mm;

valves glabrous;

ovules 10–18 per ovary;

style (0.8–)1.4–2.7(–3.6) mm.

lanceolate to narrowly so, plane, flattened, 5–11 × 1.5–2.5 mm;

valves pubescent, trichomes simple, 0.1–0.4 mm, occasionally with some 2-rayed ones;

ovules 12–18 per ovary;

style 0.3–1 mm.

Seeds

ovoid, 1–1.2 × 0.7–0.8 mm.

ovoid, 0.8–1.2 × 0.6–0.7 mm.

= 20.

= 96.

Draba abajoensis

Draba scotteri

Phenology

Flowering May–Aug.

Flowering Jun–Jul.

Habitat

Spruce, fir, or pine forests, subalpine meadows

Talus and gravelly summits in alpine communities

Elevation

1900-3800 m (6200-12500 ft)

1200-2000 m (3900-6600 ft)

Distribution

AZ; NM; UT

[BONAP county map]

Discussion

Plants of Draba abajoensis were treated by C. L. Hitchcock (1941), R. C. Rollins (1993), and N. H. Holmgren (2005b) as D. spectabilis. The differences between these taxa in chromosome number and trichome morphology strongly support their recognition as separate species (I. A. Al-Shehbaz and M. D. Windham 2007). Draba abajoensis has been collected from the Chuska and Lukachukai mountains in Apache County, Arizona, Chuska Mountains in San Juan County, New Mexico, and Abajo and La Sal mountains in San Juan and Grand counties, Utah.

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

Of conservation concern.

The description of Draba scotteri is based on collections from Kluane National Park, southwestern Yukon Territory.

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

Source

FNA vol. 7, p. 288.

FNA vol. 7, p. 335.

Parent taxa

Brassicaceae > tribe Arabideae > Draba

Sibling taxa

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. 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. 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. spectabilis var. glabrescens

Name authority

Windham & Al-Shehbaz: Harvard Pap. Bot. 12: 416. (2007)

G. A. Mulligan: Canad. J. Bot. 57: 1874. (1979)

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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Draba abajoensis

Draba scotteri

Draba abajoensis

Draba scotteri