Burke: Psilocarphus oregonus

	Psilocarphus oregonus
	Oregon woollyheads
Habit	Slender annual, the much-branched stem up to 15 cm. long, becoming prostrate, often matted; herbage closely silvery-woolly.
Leaves	Leaves opposite, entire, linear or linear-lanceolate, 6-20 mm. long and 1-3 mm. wide, usually surpassing the heads.
Flowers	Heads discoid, spheroid, terminal, but subtended by a pair of branches and leaves; involucre none; receptacle sub-globose, covered with scales; outer flowers pistillate, numerous, the short, narrow, tubular corolla loosely enclosed by a saccate, woolly bract (scale), which bears an appendage below the summit; central flowers few, staminate; pappus none.
Fruits	Achene 0.6-1.2 mm. long, swollen, smooth.

	Psilocarphus oregonus
Flowering time	May-July
Habitat	Dried beds of vernal pools, and seasonally wet rocky slopes.
Distribution	Occurring east of the Cascades crest in Washington; Washington to California, east to Idaho and Nevada. [WildflowerSearch map] [BONAP county map]
Origin	Native
Conservation status	Not of concern
Sibling taxa	P. brevissimus, P. elatior, P. tenellus
Web links	Local floras: 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

Psilocarphus oregonus

Oregon woollyheads

Habit

Slender annual, the much-branched stem up to 15 cm. long, becoming prostrate, often matted; herbage closely silvery-woolly.

Leaves

Leaves opposite, entire, linear or linear-lanceolate, 6-20 mm. long and 1-3 mm. wide, usually surpassing the heads.

Flowers

Heads discoid, spheroid, terminal, but subtended by a pair of branches and leaves;

involucre none;

receptacle sub-globose, covered with scales; outer flowers pistillate, numerous, the short, narrow, tubular corolla loosely enclosed by a saccate, woolly bract (scale), which bears an appendage below the summit; central flowers few, staminate;

pappus none.

Fruits

Achene 0.6-1.2 mm. long, swollen, smooth.