Chorizanthe watsonii

Torrey & A. Gray

Proc. Amer. Acad. Arts 8: 199. 1870. 1870

Common names: Watson’s spineflower
Treatment appears in FNA Volume 5. Treatment on page 468. Mentioned on page 447, 466.
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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, monomorphic, 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.


Phenology: Flowering Apr–Aug.
Habitat: Sandy to gravelly flats and slopes, mixed grassland, saltbush and sagebrush communities, pinyon-juniper woodlands
Elevation: 300-2400 m

Distribution

V5 982-distribution-map.gif

Ariz., Calif., Idaho, Nev., Oreg., Utah, Wash.

Discussion

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.

Selected References

None.

Lower Taxa

None.

... more about "Chorizanthe watsonii"
James L. Reveal +
Torrey & A. Gray +
Undefined sect. Acanthogonum +
Watson’s spineflower +
Ariz. +, Calif. +, Idaho +, Nev. +, Oreg. +, Utah +  and Wash. +
300-2400 m +
Sandy to gravelly flats and slopes, mixed grassland, saltbush and sagebrush communities, pinyon-juniper woodlands +
Flowering Apr–Aug. +
Proc. Amer. Acad. Arts +
Chorizanthe sect. Chorizanthella +
Chorizanthe watsonii +
Chorizanthe sect. Acanthogonum +
species +