Burke: Calamagrostis rubescens

	Calamagrostis rubescens
	pinegrass
Habit	Strongly rhizomatous perennial, the culms 5-11 dm. tall, smooth.
Leaves	Sheaths open, smooth; ligules 1-5 mm. long, obtuse, usually lacerate; blades flat, 2-4 mm. broad, scabrous on the lower side.
Flowers	Inflorescence a tight panicle 4-15 cm. long, pale greenish-white or purplish; spikelets 1-flowered; glumes 4-5 mm. long, acuminate, smooth; lemma thin, papery, shorter than the glumes, the 4 lateral veins extending into short, blunt teeth, with a twisted, bent awn attached 1 mm. above the base slightly exceeding the glumes; callus with a few hairs; palea subequal to the lemma, the rachilla prolonged behind the palea about1.2 mm. long.

	Calamagrostis rubescens
Flowering time	June-August
Habitat	Dry to moist areas, open sagebrush flats to timbered slopes, moderate to mid-elevations in the mountains.
Distribution	Occurring east of the Cascades crest in Washington; British Columbia to California, east to Alberta, Montana and Colorado [WildflowerSearch map] [BONAP county map]
Origin	Native
Conservation status	Not of concern
Sibling taxa	C. canadensis, C. howellii, C. nutkaensis, C. purpurascens, C. stricta, C. tacomensis, C. tweedyi
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

Calamagrostis rubescens

pinegrass

Habit

Strongly rhizomatous perennial, the culms 5-11 dm. tall, smooth.

Leaves

Sheaths open, smooth;

ligules 1-5 mm. long, obtuse, usually lacerate;

blades flat, 2-4 mm. broad, scabrous on the lower side.

Flowers

Inflorescence a tight panicle 4-15 cm. long, pale greenish-white or purplish;

spikelets 1-flowered;

glumes 4-5 mm. long, acuminate, smooth;

lemma thin, papery, shorter than the glumes, the 4 lateral veins extending into short, blunt teeth, with a twisted, bent awn attached 1 mm. above the base slightly exceeding the glumes;

callus with a few hairs;

palea subequal to the lemma, the rachilla prolonged behind the palea about1.2 mm. long.