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Plants
AGAVE AND YUCCA | CACTI | WILDFLOWERS

Hieracium Scouleri, Scouler's Hawkweed


Plants > Wildflowers > Asteraceae > Hieracium Scouleri
Scouler's Hawkweed; Yellow flowers of Scouler's hawkweed (hieracium scouleri), Yellowstone National Park
Yellow flowers of Scouler's hawkweed (hieracium scouleri), Yellowstone National Park
Common names:
Scouler's hawkweed, Scouler's woollyweed
Family:
Aster (Asteraceae)
Scientific name:
Hieracium scouleri
Main flower color:
Yellow
Range:
The northwestern states; south to north California, east to Montana and Utah
Height:
Between 1 and 3 feet
Habitat:
Light woodland, grassland, meadows, mostly in mountainous locations; up to 9,800 feet
Leaves:
Lanceolate, hairy (especially underneath), up to 4 inches long
Season:
June to September
Pintrest
The leaves of hieracium scouleri are lance-shaped, have a covering of long hairs, and occur both around the base and at widely spaced intervals along the stem, where they are greatly reduced in size. Stems are erect, have a light hair covering and branch towards the top.

The inflorescence is an open cluster of between 10 and 25 flowerheads. The flowerheads consist of 15 to 45 yellow ray petals (with notches at the outer edge) and a smaller number of long yellow stamens, split at the tip. Phyllaries are light to dark green in color, hairy, glandular, and do not point outwards, except at the top, right beneath the florets. The similar slender hawkweed (hieracium gracile) is unbranched and has basal leaves only. Scouler's hawkweed inhabits meadows and sunny clearings in forests, at elevations between 1,500 and 9,800 feet.




Stem with buds
Stem with buds
Scouler's Hawkweed
Hairy leaves
Two mature flowerheads
Two mature flowerheads
Overlapping flowerheads
Overlapping flowerheads
Basal leaves
Basal leaves
Hairy phyllaries
Hairy phyllaries
Buds and flowerheads
Buds and flowerheads
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