Burke: Cyperus haspan vs. Cyperus bipartitus

	Cyperus haspan	Cyperus bipartitus
		shining flatsedge
Habit		Tufted annual, the triangular, solid, slender stems 0.5-2 dm. tall.
Leaves		Leaves few, grass-like, all attached near the base, slender and elongate, 0.5-2 mm. wide, the sheaths closed.
Flowers		Inflorescence of spikelets in 1-several capitate clusters, the primary cluster sessile, the others on slender rays up to 3 cm. long in the axils of sheathless, leafy, unequal involucral bracts, at least one surpassing the inflorescence; spikelets 3-15 mm. long; scales of the spikelets in 2 vertical rows, 2-2.5 mm. long, blunt, with a pale mid-rib; perianth none; stamens usually 2; style deeply bifid.
Fruits		Achenes lenticular, 1.0-1.3 mm. long, olivaceous to blackish.

	Cyperus haspan	Cyperus bipartitus
Flowering time		June-August
Habitat		Streambanks and other wet places in the valleys and lowlands; tolerant of alkali.
Distribution	[WildflowerSearch map] [BONAP county map]	Occurring on both sides of the Cascades crest in Washington; Washington to California, east across most of the U.S. to eastern Canada and the Atlantic Coast. [WildflowerSearch map] [BONAP county map]
Origin		Native
Conservation status		Not of concern
Sibling taxa	C. acuminatus, C. bipartitus, C. diandrus, C. eragrostis, C. erythrorhizos, C. esculentus, C. fuscus, C. lupulinus, C. lupulinus × C. schweinitzii, C. schweinitzii, C. squarrosus, C. strigosus	C. acuminatus, C. diandrus, C. eragrostis, C. erythrorhizos, C. esculentus, C. fuscus, C. lupulinus, C. lupulinus × C. schweinitzii, C. schweinitzii, C. squarrosus, C. strigosus
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: 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

Cyperus haspan

Cyperus bipartitus

shining flatsedge

Habit

Tufted annual, the triangular, solid, slender stems 0.5-2 dm. tall.

Leaves

Leaves few, grass-like, all attached near the base, slender and elongate, 0.5-2 mm. wide, the sheaths closed.

Flowers

Inflorescence of spikelets in 1-several capitate clusters, the primary cluster sessile, the others on slender rays up to 3 cm. long in the axils of sheathless, leafy, unequal involucral bracts, at least one surpassing the inflorescence;

spikelets 3-15 mm. long;

scales of the spikelets in 2 vertical rows, 2-2.5 mm. long, blunt, with a pale mid-rib;

perianth none;

stamens usually 2;

style deeply bifid.

Fruits

Achenes lenticular, 1.0-1.3 mm. long, olivaceous to blackish.

Cyperus haspan

Cyperus bipartitus

Flowering time

June-August

Habitat

Streambanks and other wet places in the valleys and lowlands; tolerant of alkali.

Distribution

[WildflowerSearch map]

[BONAP county map]

Occurring on both sides of the Cascades crest in Washington; Washington to California, east across most of the U.S. to eastern Canada and the Atlantic Coast.

[WildflowerSearch map]

[BONAP county map]

Origin

Native

Conservation status

Not of concern

Sibling taxa