Burke: Bromus diandrus vs. Bromus

	Bromus diandrus	Bromus
	great brome, ripgut brome, ripgut grass	brome
Habit	Annual, the culms 4-8 dm. tall, usually glabrous.
Leaves	Leaf blades flat, 3-10 mm. wide; sheaths with soft, spreading hairs; ligules lacerate, 3-5 mm. long; auricles lacking.
Flowers	Inflorescence a spreading to erect panicle 10-15 cm. long, the branches elongate, bearing only 1-2 spikelets; spikelets 5- to 7-flowered, 2.5-4 cm. long, broadest above mid-length; glumes glabrous, narrowly lanceolate, the first 1-nerved, 15-20 mm. long, the second 3-nerved, 25-33 mm. long; lemmas 25-30 mm. long, puberulent, the 2 teeth slender, 3-4 mm. long, the awn attached between the teeth 3.5-6 cm. long, straight; stamens 3.

	Bromus diandrus	Bromus
Flowering time	April-June
Habitat	Grassy balds, prairies, roadsides, wastelots, and other disturbed open areas at low to moderate elevations.
Distribution	Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, southern Great Plains, and in eastern North America. [WildflowerSearch map] [BONAP county map]	[BONAP county map]
Origin	Introduced from Europe	Native
Conservation status	Not of concern	Not of concern
Sibling taxa	B. arenarius, B. briziformis, B. ciliatus, B. commutatus, B. erectus, B. hordeaceus, B. inermis, B. japonicus, B. madritensis, B. orcuttianus, B. pacificus, B. pumpellianus, B. racemosus, B. rubens, B. secalinus, B. sitchensis, B. squarrosus, B. sterilis, B. suksdorfii, B. tectorum, B. vulgaris
Subordinate taxa		B. arenarius, B. briziformis, B. ciliatus, B. commutatus, B. diandrus, B. erectus, B. hordeaceus, B. inermis, B. japonicus, B. madritensis, B. orcuttianus, B. pacificus, B. pumpellianus, B. racemosus, B. rubens, B. secalinus, B. sitchensis, B. squarrosus, B. sterilis, B. suksdorfii, B. tectorum, B. vulgaris
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	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

Bromus diandrus

Bromus

great brome, ripgut brome, ripgut grass

brome

Habit

Annual, the culms 4-8 dm. tall, usually glabrous.

Leaves

Leaf blades flat, 3-10 mm. wide;

sheaths with soft, spreading hairs;

ligules lacerate, 3-5 mm. long;

auricles lacking.

Flowers

Inflorescence a spreading to erect panicle 10-15 cm. long, the branches elongate, bearing only 1-2 spikelets;

spikelets 5- to 7-flowered, 2.5-4 cm. long, broadest above mid-length;

glumes glabrous, narrowly lanceolate, the first 1-nerved, 15-20 mm. long, the second 3-nerved, 25-33 mm. long;

lemmas 25-30 mm. long, puberulent, the 2 teeth slender, 3-4 mm. long, the awn attached between the teeth 3.5-6 cm. long, straight;

stamens 3.

Bromus diandrus

Bromus

Flowering time

April-June

Habitat

Grassy balds, prairies, roadsides, wastelots, and other disturbed open areas at low to moderate elevations.

Distribution

Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to the Rocky Mountains, southern Great Plains, and in eastern North America.

[WildflowerSearch map]

[BONAP county map]