dcsimg
539.sdh ccdb 24960 c08 ccdb 24948  g09 h161062 1445453378 jpg.130x130
Life » » Plants » » Knotweed family »

Watson Spineflower

Chorizanthe watsonii A. Gray

Brief Summary

    Chorizanthe watsonii: Brief Summary
    provided by wikipedia

    Chorizanthe watsonii is a species of flowering plant in the buckwheat family known by the common name fivetooth spineflower. It is native to the western United States from Washington to the Mojave Desert. It grows in many types of plant communities from desert scrub to woodland and sagebrush. This small plant grows a woolly erect stem up to about 15 centimeters tall. The inflorescence is a cluster of flowers surrounded by five hairy greenish bracts tipped with hooked awns. The flower is about 2 millimeters wide and yellow in color.

Comprehensive Description

Distribution

    Distribution
    provided by eFloras
    Ariz., Calif., Idaho, Nev., Oreg., Utah, Wash.

Morphology

    Comments
    provided by eFloras
    Chorizanthe watsonii is widely distributed in the cold desert of the Great Basin and in the northern part of the warmer Mojave Desert. Plants in the northern part of the range (especially on the Palouse Prairie of south-eastern Washington) usually have three stamens.
    Description
    provided by eFloras
    Plants spreading to erect, 0.2-1(-1.5) × 0.2-1(-1.5) dm, densely canescent-strigose. Leaves basal or nearly so; petiole (0.5-)1-2.5(-3) cm; blade oblanceolate, (0.3-)0.5-1.5(-2) × 0.2-0.4(-0.5) cm, thinly floccose to sparsely tomentose. Inflorescences with involucres in small clusters 0.5-1 cm diam., greenish to reddish; bracts 2, with laminar ones oblanceolate, (0.5-)0.8-1.5(-2) cm × (1-)2-4 mm, those at distal nodes becoming sessile, reduced and scalelike, linear-lanceolate, acicular, awns slightly curved, 0.5-1 mm. Involucres 1, green, cylindric, 5-ribbed, 3-4.5 mm, finely corrugate, pubescent; teeth 5, erect, unequal, with leaflike, narrowly lanceolate, 2-6 mm anterior tooth, others linear, 1-2 mm; awn uncinate, 0.4-0.8(-1) mm. Flowers 1, included to slightly exserted; perianth yellow, cylindric, 1.5-2.5 mm, thinly pubescent abaxially; tepals connate ca. 2/ 3 their length, mono-morphic, oblong, acute, entire apically, mostly erect; stamens 3 or 9, slightly exserted; filaments distinct, 0.8-1 mm, glabrous; anthers yellow, ovate, 0.2-0.3 mm. Achenes brown, lenticular, 2.5-3 mm.

Habitat

    Habitat
    provided by eFloras
    Sandy to gravelly flats and slopes, mixed grassland, saltbush and sagebrush communities, pinyon-juniper woodlands; 300-2400m.

Cyclicity

    Flowering/Fruiting
    provided by eFloras
    Flowering Apr-Aug.