OregonFlora: Draba incerta vs. Draba maguirei

	Draba incerta	Draba maguirei
	Yellowstone draba
Habit	Plants perennial, cespitose, often pulvinate, scapose; caudices many-branched, some terminated in sterile rosettes.
Stems	(1.5)4–14(21) cm; simple, pubescent with simple and 2–5-rayed or mostly subpectinate trichomes, sometimes glabrous distally.
Basal leaves	rosulate, narrowly oblanceolate to linear; (4)6–17(25) × (1)1.5–3.5(5) mm; margins entire, ciliate; midveins usually obscure; surfaces pubescent with short-stalked, pectinate trichomes; at least a few 4–6-rayed, adaxially sometimes glabrous.
Cauline leaves	absent or rarely 1, linear to oblong.
Inflorescences	3–14(30)-flowered; rachises straight, glabrous or pubescent, fruiting pedicels ascending; straight; (2.5)4–11(27) mm.
Flowers	sepals ovate, 2.5–3.5(4) mm; petals oblanceolate to obovate, 4–6 × 1.5–2.5 mm, yellow fading to white; ovules 8–16(20) per ovary; styles 0.2–0.9 mm.
Fruits	broadly ovate to lanceolate, flattened, untwisted, 5–9(11) × 2–4 mm, glabrous or puberulent with simple and 2-rayed trichomes.
Seeds	oblong, flattened, 1.1–1.5 × 0.7–1 mm; wingless.
2n	=112.

	Draba incerta	Draba maguirei
Distribution	[WildflowerSearch map] [BONAP county map]	[BONAP county map]
Discussion	Rock outcrops, talus, gravelly areas. Flowering Jun–Aug. 2300–2500 m. BW. ID, NV, WA; north to AK, northeast to Northwest Territories, east to WY, southeast to CO, Quebec. Native.
Source	Flora of Oregon, volume 2, page 480 Ihsan Al-Shehbaz
Sibling taxa	D. albertina, D. aureola, D. cana, D. crassifolia, D. cusickii, D. cyclomorpha, D. densifolia, D. howellii, D. lonchocarpa, D. nemorosa, D. novolympica, D. oligosperma, D. praealta, D. stenoloba, D. verna	D. albertina, D. aureola, D. cana, D. crassifolia, D. cusickii, D. cyclomorpha, D. densifolia, D. howellii, D. incerta, D. lonchocarpa, D. nemorosa, D. novolympica, D. oligosperma, D. praealta, D. stenoloba, D. verna
Synonyms	Draba incerta var. incerta
Web links	Local floras: BC, OR, WA Local Web sites: Flora NW, 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 Web sites: Flora NW, 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 incerta

Draba maguirei

Yellowstone draba

Habit

Plants perennial, cespitose, often pulvinate, scapose; caudices many-branched, some terminated in sterile rosettes.

Stems

(1.5)4–14(21) cm; simple, pubescent with simple and 2–5-rayed or mostly subpectinate trichomes, sometimes glabrous distally.

Basal leaves

rosulate, narrowly oblanceolate to linear; (4)6–17(25) × (1)1.5–3.5(5) mm;

margins entire, ciliate;

midveins usually obscure;

surfaces pubescent with short-stalked, pectinate trichomes; at least a few 4–6-rayed, adaxially sometimes glabrous.

Cauline leaves

absent or rarely 1, linear to oblong.

Inflorescences

3–14(30)-flowered;

rachises straight, glabrous or pubescent, fruiting pedicels ascending; straight; (2.5)4–11(27) mm.

Flowers

sepals ovate, 2.5–3.5(4) mm;

petals oblanceolate to obovate, 4–6 × 1.5–2.5 mm, yellow fading to white;

ovules 8–16(20) per ovary;

styles 0.2–0.9 mm.

Fruits

broadly ovate to lanceolate, flattened, untwisted, 5–9(11) × 2–4 mm, glabrous or puberulent with simple and 2-rayed trichomes.

Seeds

oblong, flattened, 1.1–1.5 × 0.7–1 mm; wingless.

=112.

Draba incerta

Draba maguirei

Distribution

[WildflowerSearch map]

[BONAP county map]

Discussion

Rock outcrops, talus, gravelly areas. Flowering Jun–Aug. 2300–2500 m. BW. ID, NV, WA; north to AK, northeast to Northwest Territories, east to WY, southeast to CO, Quebec. Native.

Source

Flora of Oregon, volume 2, page 480
Ihsan Al-Shehbaz

Sibling taxa