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Douglas' spineflower, San Benito spineflower

starlet spineflower, starlite spineflower

Habit Plants erect, 1–4(–5) × 0.5–3 dm, villous. Plants erect, 0.5–2.5(–3) × 0.5–3 dm, hirsute.
Leaves

basal;

petiole 1–3(–6) cm;

blade oblanceolate, 0.5–2(–4) × 0.1–0.4(–1) cm, villous.

basal;

petiole 0.1–0.5 cm;

blade narrowly lanceolate to oblanceolate, 0.5–2 × 0.8–2(–2.2) cm, hirsute.

Inflorescences

cymose, dichotomously branched throughout, white to greenish or reddish;

bracts usually 2, similar to proximal leaf blades, typically with whorl of 3–5 ca. midstem, short-petiolate, becoming linear and aciculate at distal nodes, acerose, 0.5–2(–3) cm × 1–5(–10) mm, awns absent.

cymose, dichotomously branched throughout, white to greenish or reddish;

bracts usually 2, similar to leaves at proximal nodes only reduced, typically with whorl of 3–5 ca. midstem, short-petiolate, becoming linear and aciculate at distal nodes, acerose, 0.5–2(–3) cm × 10–30(–40) mm, awns absent.

Involucres

congested in small leafy terminal clusters of 2–4 at nodes of dichotomies, greenish, cylindric, slightly ventricose basally, 3–5 mm, with conspicuous, purple, broad, membranous margins typically extending across sinuses, finely corrugated, hispid at least along ridges, otherwise sparsely pubescent;

teeth spreading, equal, (0.7–)1–1.5 mm, awns straight, 0.5–1 mm.

congested in small bracteated terminal clusters of 2–4 at node of dichotomies, tannish, cylindric, slightly ventricose basally, 3–4 mm, with conspicuous, white, broad, membranous margins typically extending up tooth to awn, finely corrugated, hispid at least along ridges, otherwise sparsely pubescent;

teeth spreading, equal, 1–1.5 mm, awns straight, 0.5–1 mm.

Flowers

exserted;

perianth white to rose, cylindric, 3.5–4(–4.5) mm, slightly pubescent abaxially;

tepals connate 2/3 their length, monomorphic, obovate, 2-lobed or denticulate apically, infrequently inner whorl entire;

stamens 9, slightly exserted;

filaments distinct, 3–4 mm, glabrous;

anthers pink to red, oblong, 0.5–0.6 mm.

exserted;

perianth cream to creamy white or rose, cylindric, 4–4.5(–5) mm, slightly pubescent abaxially;

tepals connate 2/3 their length, monomorphic, obovate, obcordate to 2-lobed apically, sometimes slightly irregular but not distinctly erose;

stamens 9, slightly exserted;

filaments distinct, 4–5 mm, glabrous;

anthers pink to red, oblong, 0.5–0.6 mm.

Achenes

light brown, globose-lenticular, 3.5–4 mm.

light brown, globose-lenticular, 3.5–4.5 mm.

2n

= 40.

= 38, 40, 44.

Chorizanthe douglasii

Chorizanthe stellulata

Phenology Flowering Apr–Jul. Flowering Apr–Jul.
Habitat Sandy to gravelly flats and slopes, mixed grassland communities, oak and pine woodlands Sandy to gravelly flats and slopes, mixed grassland and chaparral communities, oak-pine woodlands
Elevation (200-)300-1600 m ((700-)1000-5200 ft) 30-900 m (100-3000 ft)
Distribution
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
from FNA
CA
[WildflowerSearch map]
[BONAP county map]
Discussion

Chorizanthe douglasii is restricted to the Santa Lucia Mountains and to the San Gabilan and La Panza ranges of west-central California. The species is infrequent but can be locally common. A single collection made in the Santa Cruz Mountains (Rowntree s.n., 16 Jun 1929, CAS) may have been made in Santa Cruz County, but the location is uncertain and no other collection is known from that region.

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

Chorizanthe stellulata can be locally common in the foothills bordering the Central Valley from Shasta County south to Stanislaus County on the western side, and to Tulare County on the eastern side. Post-flowering specimens of starlite spineflower and Douglas’s spineflower are sometimes difficult to distinguish. The margins of the involucre in the former are always white; those of C. douglasii are purple.

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

Source FNA vol. 5, p. 452. FNA vol. 5, p. 452.
Parent taxa Polygonaceae > subfam. Eriogonoideae > Chorizanthe > subg. Amphietes > sect. Ptelosepala Polygonaceae > subfam. Eriogonoideae > Chorizanthe > subg. Amphietes > sect. Ptelosepala
Sibling taxa
C. angustifolia, C. biloba, C. blakleyi, C. brevicornu, C. breweri, C. clevelandii, C. corrugata, C. cuspidata, C. diffusa, 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. watsonii, 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. polygonoides, C. procumbens, C. pungens, C. rectispina, C. rigida, C. robusta, C. spinosa, C. staticoides, C. uniaristata, C. valida, C. ventricosa, C. watsonii, C. wheeleri, C. xanti
Synonyms C. nortonii
Name authority Bentham: Trans. Linn. Soc. London 17: 418. (1836) Bentham: in A. P. de Candolle and A. L. P. P. de Candolle., Prodr. 14: 26. (1856)
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