Burke: Crepis tectorum vs. Crepis acuminata

	Crepis tectorum	Crepis acuminata
	annual hawksbeard, narrow leaf hawksbeard, rooftop hawksbeard	long-leaved hawksbeard, tapertip hawksbeard
Habit	Glabrous annual, 1-10 dm. tall, with milky juice.	Perennial with 1-3 stems from a taproot, 2-7 dm. tall, the herbage usually covered with fine, grey, woolly hairs, the juice milky.
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 1-4 dm. long, pinnately lobed, mostly with broad central rachis, the lobes entire or sometimes toothed or cleft; upper leaves few and reduced.
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 numerous, 20-200, cylindric, 5-10 flowered; involucre 8-16 mm. high, glabrous, the outer bracts less than half a long as the 5-7 inner ones; corollas 10-18 mm. long, all ligulate and yellow.
Fruits	Achenes 2.5-4.5 mm. long, dark reddish-brown, spindle-shaped, with 10 ribs.	Achenes yellow or brownish.

	Crepis tectorum	Crepis acuminata
Flowering time	June-August	May-July
Habitat	Roadsides, fields, ditches, wastelots, and other disturbed, open areas.	Dry slopes and forest openings from the foothiils 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 California, 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. atribarba, 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: CA, OR, WA Local Web sites: CalFlora, CalPhotos, 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 acuminata

annual hawksbeard, narrow leaf hawksbeard, rooftop hawksbeard

long-leaved hawksbeard, tapertip hawksbeard

Habit

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

Perennial with 1-3 stems from a taproot, 2-7 dm. tall, the herbage usually covered with fine, grey, woolly hairs, the juice milky.

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 1-4 dm. long, pinnately lobed, mostly with broad central rachis, the lobes entire or sometimes toothed or cleft; upper leaves few and reduced.

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 numerous, 20-200, cylindric, 5-10 flowered;

involucre 8-16 mm. high, glabrous, the outer bracts less than half a long as the 5-7 inner ones;

corollas 10-18 mm. long, all ligulate and yellow.

Fruits

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

Achenes yellow or brownish.

Crepis tectorum

Crepis acuminata

Flowering time

June-August

May-July

Habitat

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

Dry slopes and forest openings from the foothiils 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]