Burke: Crepis tectorum vs. Crepis occidentalis

	Crepis tectorum	Crepis occidentalis
	annual hawksbeard, narrow leaf hawksbeard, rooftop hawksbeard	western hawksbeard
Habit	Glabrous annual, 1-10 dm. tall, with milky juice.	Stout perennial from a taproot and short, woody base, stems 1-3, 0.5- 4 dm. tall, the herbage densely grey-woolly, at least when young, with milky juice.
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.	Lower leaves 1.5-3 dm. long, toothed with backward-pointing segments, to deeply pinnatifid with toothed lobes; cauline leaves few and greatly 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 2-25, 10-40 flowered; involucre 11-19 mm. high, often with some black-tipped glandular bristles, the inner bracts 8-13, more than twice as long as the outer; corollas all ligulate, yellow; pappus of numerous capillary bristles.
Fruits	Achenes 2.5-4.5 mm. long, dark reddish-brown, spindle-shaped, with 10 ribs.	Achenes spindle-shaped, brown.

	Crepis tectorum	Crepis occidentalis
Flowering time	June-August	May-July
Habitat	Roadsides, fields, ditches, wastelots, and other disturbed, open areas.	Dry, open places, mostly in the foothills and plains, but also found in the subalpine.
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 chiefly east of the Cascades crest in Washington; central British Columbia to California, east to the Rocky Mountains and northern Great Plains of Canada and the U.S. [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. atribarba, C. bakeri, C. barbigera, C. capillaris, C. intermedia, C. modocensis, C. nicaeensis, 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, 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 occidentalis

annual hawksbeard, narrow leaf hawksbeard, rooftop hawksbeard

western hawksbeard

Habit

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

Stout perennial from a taproot and short, woody base, stems 1-3, 0.5- 4 dm. tall, the herbage densely grey-woolly, at least when young, with milky juice.

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.

Lower leaves 1.5-3 dm. long, toothed with backward-pointing segments, to deeply pinnatifid with toothed lobes;

cauline leaves few and greatly 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 2-25, 10-40 flowered;

involucre 11-19 mm. high, often with some black-tipped glandular bristles, the inner bracts 8-13, more than twice as long as the outer;

corollas all ligulate, yellow;

pappus of numerous capillary bristles.

Fruits

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

Achenes spindle-shaped, brown.

Crepis tectorum

Crepis occidentalis

Flowering time

June-August

May-July

Habitat

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

Dry, open places, mostly in the foothills and plains, but also found in the subalpine.

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 chiefly east of the Cascades crest in Washington; central British Columbia to California, east to the Rocky Mountains and northern Great Plains of Canada and the U.S.

[WildflowerSearch map]

[BONAP county map]

Origin

Introduced from Europe

Native

Conservation status

Not of concern

Sibling taxa