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Range: Coast Ranges from southern Oregon to central California.

Range: the Central Valley of California. Additional info: the range in coloration may be due partly to hybridization with other native species, common among western irises.

Range: southern British Columbia to Northern California, mostly east of the Cascade Mountains; east to northern Utah and Idaho.

Range: southeastern California to western Texas; northern Mexico. Additional info: this species is commonly found among creosotebush. Similar species lack glands beneath flowers and have different barb arrangements on prickles of fruit.

Habitat: Shaded damp forests near the coast. Range: Central California to southwestern Oregon.

Habitat: Dry open hills and plains, often in open brush or woods. Range: Southwestern Oregon to Southern California.

Habitat: Moist meadows. Range: Southern British Columbia to Northern California; east to northern Utah, Wyoming, and Montana.

Habitat: Dry soil on plains, among sagebrush, and in open pine forests. Range: Eastern Montana and western North Dakota; south to eastern Idaho and northwestern Nebraska; across Utah and western Colorado to northern Arizona and northwestern New Mexico. Other info: Occasionally petals are magenta or tinged with lilac. The Ute Indians called it "sago," and taught Mormon settlers to eat the bulbs in times of scarcity.

Habitat: Loose, dry soil on plains, among sagebrush, and in yellow pine forests. Range: The eastern side of the Cascade Mountains from southern British Columbia to Northern California; east to northern Nevada and across central and northern Idaho to western Montana. Other info: One of the most frequent Mariposa Tulips in the arid northwest. A white phase with a reddish stripe on each petal occurs in southeastern Washington and adjacent west-central Idaho.

Habitat: Dry slopes in brush and open woods. Range: Northern California.

Habitat: Shaded, often rocky places, in open woods and brush. Range: Southern two-thirds of California.

Habitat: Dry plains and grassy hillsides. Range: Northern Oregon to Southern California.

Habitat: On dry flats and hills, in grass, brush, and oak woodlands. Range: Southern one-third of California to Baja California.

Habitat: Rich soil in canyons, on hills among piñon and juniper, and in pine forests. Range: North-central Arizona to central Texas; south into Mexico.

Habitat: Moist soils in cool mountain forests. Range: Across northern North America; south to southern Oregon, Arizona, New Mexico, and Texas; in the eastern mountains to Georgia; also in Mexico. Other: The "nodding" umbel distinguishes this species from all others in the West.

Habitat: Open, often rocky slopes, among brush and pines. Range: British Columbia to central California and Southern Asia; east to southern Wyoming and western Colorado.

Range: throughout. Habitat: Ponds or slowly moving water. Other: Of possibly 5 species in the West, several difficult to distinguish, this has the largest flowers.

Habitat: Bogs and wet soil, rocks, or banks. Range: Alaska to northwestern California; east across the northern states and Canada.

Range: Northwestern Oregon to Baja California.
The genus name comes from Greek words trichos ("hair") and stemon ("stamen"), referring to the long, slender stamens, characteristic of the genus.

A little known fact is that this weed is actually a part of the mint (Lamiaceae) family. Its natural habitat is in open slopes in woods, and can be found anywhere from British Columbia to Montana & Washington.