Burke: Crepis tectorum vs. Crepis atribarba

	Crepis tectorum	Crepis atribarba
	annual hawksbeard, narrow leaf hawksbeard, rooftop hawksbeard	slender hawksbeard
Habit	Glabrous annual, 1-10 dm. tall, with milky juice.	Perennial with 1 or 2 stems from a tap-root, 1.5-7 dm. tall, with milky juice, covered with fine, short white wool at least when young.
Leaves	Basal leaves petiolate, the blade lanceolate or oblanceolate, finely toothed to pinnately parted, up to 15 cm. long and 4 cm. wide; reduced cauline leaves sessile and auriculate, linear, often involute.	Basal and lower cauline leaves 1-3.5 dm. long, deeply pinnatifid, with narrow main axis and linear, entire segments; upper leaves becoming linear and entire.
Flowers	Heads several to numerous, 30-70 flowered; involucre 6-9 mm. high, its inner bracts 12-15, with fine hairs and sometimes with stalked glands as well, the outer bracts about one-third as long; corollas all ligulate, yellow.	Heads 3-30(40) with 10-40 flowers; corollas 10-18 mm long; involucre 8-15 mm high, typically with gray tomentum and often with black setae that lack glands; involucre rarely glabrous; outer involucral bracts less than half as long as the mostly 8-10 inner ones.
Fruits	Achenes 2.5-4.5 mm. long, dark reddish-brown, spindle-shaped, with 10 ribs.	Achenes greenish, tapered to the tip.

	Crepis tectorum	Crepis atribarba
Flowering time	June-August	May-July
Habitat	Roadsides, fields, ditches, wastelots, and other disturbed, open areas.	Dry slopes, sagebrush, and forest openings from foothills to middle elevations in the mountains.
Distribution	Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across the northern regions of the U.S. and Canada to the Atlantic Coast. [WildflowerSearch map] [BONAP county map]	Occurring east of the Cascades crest in Washington; British Columbia to Nevada, east to the Rocky Mountains and northern Great Plains. [WildflowerSearch map] [BONAP county map]
Origin	Introduced from Europe	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	C. acuminata, C. atribarba, C. bakeri, C. barbigera, C. capillaris, C. intermedia, C. modocensis, C. nicaeensis, C. occidentalis, C. runcinata, C. setosa	C. acuminata, C. bakeri, C. barbigera, C. capillaris, C. intermedia, C. modocensis, C. nicaeensis, C. occidentalis, C. runcinata, C. setosa, C. tectorum
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, 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 floras: BC, OR, WA Local Web sites: Flora NW, PNW Herbaria, Turner Photog. WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Crepis atribarba

annual hawksbeard, narrow leaf hawksbeard, rooftop hawksbeard

slender hawksbeard

Habit

Glabrous annual, 1-10 dm. tall, with milky juice.

Perennial with 1 or 2 stems from a tap-root, 1.5-7 dm. tall, with milky juice, covered with fine, short white wool at least when young.

Leaves

Basal leaves petiolate, the blade lanceolate or oblanceolate, finely toothed to pinnately parted, up to 15 cm. long and 4 cm. wide; reduced cauline leaves sessile and auriculate, linear, often involute.

Basal and lower cauline leaves 1-3.5 dm. long, deeply pinnatifid, with narrow main axis and linear, entire segments; upper leaves becoming linear and entire.

Flowers

Heads several to numerous, 30-70 flowered;

involucre 6-9 mm. high, its inner bracts 12-15, with fine hairs and sometimes with stalked glands as well, the outer bracts about one-third as long;

corollas all ligulate, yellow.

Heads 3-30(40) with 10-40 flowers;

corollas 10-18 mm long;

involucre 8-15 mm high, typically with gray tomentum and often with black setae that lack glands;

involucre rarely glabrous; outer involucral bracts less than half as long as the mostly 8-10 inner ones.

Fruits

Achenes 2.5-4.5 mm. long, dark reddish-brown, spindle-shaped, with 10 ribs.

Achenes greenish, tapered to the tip.

Crepis tectorum

Crepis atribarba

Flowering time

June-August

May-July

Habitat

Roadsides, fields, ditches, wastelots, and other disturbed, open areas.

Dry slopes, sagebrush, and forest openings from foothills to middle elevations in the mountains.

Distribution

Occurring in scattered locations on both sides of the Cascades crest in Washington; Alaska to California, east across the northern regions of the U.S. and Canada to the Atlantic Coast.

[WildflowerSearch map]

[BONAP county map]