Burke: Amaranthus muricatus vs. Amaranthus powellii

	Amaranthus muricatus	Amaranthus powellii
		green amaranth, Powell's amaranth
Habit		Monoecious, erect, simple to freely-branched annual, the 1-several stems up to 2 m. tall, striate and reddish, usually glabrous below the inflorescence.
Leaves		Leaves alternate, the blade lanceolate or ovate to deltoid-elliptic, 2-10 cm. long, usually glabrous, narrowed abruptly to petioles about as long.
Flowers		Flowers numerous in crowded, spike-like, terminal or axillary clusters that are usually compound and up to 15 cm. long, subtended by several linear-lanceolate, spine-tipped bracts 2.5-5 mm. long; sepals somewhat unequal, those of the pistillate flowers about equal to the fruit, 2-3 mm. long, narrowly oblong, acute to obtuse; petals none; stamens usually 3; styles 3.
Fruits		1-seeded capsule.

	Amaranthus muricatus	Amaranthus powellii
Flowering time		July-October
Habitat		Fields, roadsides, wastelots, and other disturbed areas.
Distribution	[BONAP county map]	Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east across North America to the Atlantic Coast. [WildflowerSearch map] [BONAP county map]
Origin		Introduced from the southwestern United States and Mexico
Conservation status		Not of concern
Sibling taxa	A. albus, A. blitoides, A. blitum, A. californicus, A. caudatus, A. cruentus, A. deflexus, A. hybridus, A. hypochondriacus, A. powellii, A. retroflexus, A. tuberculatus	A. albus, A. blitoides, A. blitum, A. californicus, A. caudatus, A. cruentus, A. deflexus, A. hybridus, A. hypochondriacus, A. retroflexus, A. tuberculatus
Web links	Local Web sites: 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: 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

Amaranthus muricatus

Amaranthus powellii

green amaranth, Powell's amaranth

Habit

Monoecious, erect, simple to freely-branched annual, the 1-several stems up to 2 m. tall, striate and reddish, usually glabrous below the inflorescence.

Leaves

Leaves alternate, the blade lanceolate or ovate to deltoid-elliptic, 2-10 cm. long, usually glabrous, narrowed abruptly to petioles about as long.

Flowers

Flowers numerous in crowded, spike-like, terminal or axillary clusters that are usually compound and up to 15 cm. long, subtended by several linear-lanceolate, spine-tipped bracts 2.5-5 mm. long;

sepals somewhat unequal, those of the pistillate flowers about equal to the fruit, 2-3 mm. long, narrowly oblong, acute to obtuse;

petals none;

stamens usually 3;

styles 3.

Fruits

1-seeded capsule.