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five-tooth spineflower, Watson's spineflower

knotweed spineflower

Habit Plants spreading to erect, 0.2–1(–1.5) × 0.2–1(–1.5) dm, densely canescent-strigose. Plants prostrate, 0.1–0.5 × 0.3–2(–2.5) dm, villous.
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.

basal;

petiole 0.5–1 cm;

blade oblanceolate to elliptic, 0.3–1 × 0.2–0.3 cm, thinly pubescent.

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.

with involucres in small clusters 0.5–1 cm across even at dichotomies, greenish or reddish;

bracts 2, petiolate or sessile, similar to proximal leaf blades, oblanceolate or narrowly elliptic to linear-lanceolate, 0.3–1 cm × 1–3 mm, awns absent.

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.

1, greenish or reddish, campanulate, 5–6-ribbed, 1.5–2.5 mm, corrugate, thinly pubescent;

teeth 5–6, unequal, 3 longer ones 1.5–3 mm, these alternating with 2 or 3 shorter ones 1–2 mm, anterior tooth not leaflike;

awns of prominent teeth uncinate and 1.5–3 mm, those of shorter teeth straight and 1–2 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.

1, included to slightly exserted;

perianth white to rose, cylindric, 1.5–1.8(–2) mm, densely pubescent abaxially;

tepals connate 2/3 their length, monomorphic, oblong, obtuse to truncate or minutely emarginate apically;

stamens (6) 9, slightly exserted;

filaments distinct, 0.8–1 mm, glabrous;

anthers reddish, ovate, 0.2–0.3 mm.

Achenes

brown, lenticular, 2.5–3 mm.

dark brown to black, 3-gonous, 2–2.5 mm.

Chorizanthe watsonii

Chorizanthe polygonoides

Phenology Flowering Apr–Aug.
Habitat Sandy to gravelly flats and slopes, mixed grassland, saltbush and sagebrush communities, pinyon-juniper woodlands
Elevation 300-2400 m (1000-7900 ft)
Distribution
from FNA
AZ; CA; ID; NV; OR; UT; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA; nw Mexico
[WildflowerSearch map]
[BONAP county map]
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.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Varieties 2 (2 in the flora).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Key
1. Involucres 2-2.5 mm; awns of prominent involucral teeth 1.5-2 mm
var. polygonoides
1. Involucres 1.5-2 mm; awns of prominent involucral teeth 2-3 mm
var. longispina
Source FNA vol. 5, p. 468. FNA vol. 5, p. 466.
Parent taxa Polygonaceae > subfam. Eriogonoideae > Chorizanthe > subg. Amphietes > sect. Acanthogonum Polygonaceae > subfam. Eriogonoideae > Chorizanthe > subg. Amphietes > sect. Acanthogonum
Sibling taxa
C. angustifolia, C. biloba, C. blakleyi, C. brevicornu, C. breweri, C. clevelandii, C. corrugata, C. cuspidata, C. diffusa, C. douglasii, C. fimbriata, C. howellii, C. leptotheca, C. membranacea, C. obovata, C. orcuttiana, C. palmeri, C. parryi, C. polygonoides, C. procumbens, C. pungens, C. rectispina, C. rigida, C. robusta, C. spinosa, C. staticoides, C. stellulata, C. uniaristata, C. valida, C. ventricosa, C. wheeleri, C. xanti
C. angustifolia, C. biloba, C. blakleyi, C. brevicornu, C. breweri, C. clevelandii, C. corrugata, C. cuspidata, C. diffusa, C. douglasii, C. fimbriata, C. howellii, C. leptotheca, C. membranacea, C. obovata, C. orcuttiana, C. palmeri, C. parryi, C. procumbens, C. pungens, C. rectispina, C. rigida, C. robusta, C. spinosa, C. staticoides, C. stellulata, C. uniaristata, C. valida, C. ventricosa, C. watsonii, C. wheeleri, C. xanti
Subordinate taxa
C. polygonoides var. longispina, C. polygonoides var. polygonoides
Name authority Torrey & A. Gray: Proc. Amer. Acad. Arts 8: 199. (1870) Torrey & A. Gray: Proc. Amer. Acad. Arts 8: 197. (1870)
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