Burke: Hieracium aurantiacum vs. Hieracium albiflorum

	Hieracium aurantiacum	Hieracium albiflorum
	orange hawkweed	white hawkweed, white-flowered hawkweed
Habit	Perennial from fibrous roots and long rhizomes, the bristly stems 2-9 dm. tall, with milky juice.	Perennial from fibrous roots and a short rhizome, 3-13 dm. tall, a few long hairs on the lower stem, with milky juice.
Leaves	Leaves all basal except for 1 or 2 very small cauline leaves, with long bristles on both sides, oblanceolate-linear, up to 1 dm. long.	Basal and lower cauline leaves persistent and tufted, mostly entire, 4-17 cm. long including the short petiole, and 1.2-4.5 cm. wide; middle and upper leaves sessile and reduced; stellate hairs wanting.
Flowers	Heads several in a compact terminal cluster, the corollas all ligulate and bright red-orange.	Heads several to many in an open inflorescence, on slender peduncles; involucre 6-11 mm. high, narrow, blackish-green, nearly glabrous; corollas 13-34, all ligulate and white; pappus of whitish capillary bristles.
Fruits		Achenes ribbed and grooved longitudinally.

	Hieracium aurantiacum	Hieracium albiflorum
Flowering time	June-August	June-September
Habitat	Roadsides, fields, meadows, pastures, forest edge, wastelots, and other disturbed areas at low to middle elevations.	Open woods from low to middle elevations.
Distribution	Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across southern Canada and northern U.S; widely distributed throughout eastern U.S. [WildflowerSearch map] [BONAP county map]	Widely distributed in forested areas on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern Canada. [WildflowerSearch map] [BONAP county map]
Origin	Introduced from Europe	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	H. albiflorum, H. caespitosum, H. flagellare, H. ×floribundum, H. glomeratum, H. lachenalii, H. longiberbe, H. maculatum, H. murorum, H. pilosella, H. piloselloides, H. sabaudum, H. scouleri, H. ×stoloniflorum, H. triste, H. umbellatum	H. aurantiacum, H. caespitosum, H. flagellare, H. ×floribundum, H. glomeratum, H. lachenalii, H. longiberbe, H. maculatum, H. murorum, H. pilosella, H. piloselloides, H. sabaudum, H. scouleri, H. ×stoloniflorum, H. triste, H. umbellatum
Web links	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	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

Hieracium albiflorum

orange hawkweed

white hawkweed, white-flowered hawkweed

Habit

Perennial from fibrous roots and long rhizomes, the bristly stems 2-9 dm. tall, with milky juice.

Perennial from fibrous roots and a short rhizome, 3-13 dm. tall, a few long hairs on the lower stem, with milky juice.

Leaves

Leaves all basal except for 1 or 2 very small cauline leaves, with long bristles on both sides, oblanceolate-linear, up to 1 dm. long.

Basal and lower cauline leaves persistent and tufted, mostly entire, 4-17 cm. long including the short petiole, and 1.2-4.5 cm. wide; middle and upper leaves sessile and reduced; stellate hairs wanting.

Flowers

Heads several in a compact terminal cluster, the corollas all ligulate and bright red-orange.

Heads several to many in an open inflorescence, on slender peduncles;

involucre 6-11 mm. high, narrow, blackish-green, nearly glabrous;

corollas 13-34, all ligulate and white;

pappus of whitish capillary bristles.

Fruits

Achenes ribbed and grooved longitudinally.

Hieracium aurantiacum

Hieracium albiflorum

Flowering time

June-August

June-September

Habitat

Roadsides, fields, meadows, pastures, forest edge, wastelots, and other disturbed areas at low to middle elevations.

Open woods from low to middle elevations.

Distribution

Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across southern Canada and northern U.S; widely distributed throughout eastern U.S.

[WildflowerSearch map]

[BONAP county map]

Widely distributed in forested areas on both sides of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, northern Great Plains, Great Lakes region, and eastern Canada.

[WildflowerSearch map]

[BONAP county map]

Origin

Introduced from Europe

Native

Conservation status

Not of concern

Sibling taxa