Flora of North America species comparison

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Chorizanthe biloba var. biloba

Chorizanthe subg. Amphietes
Photo is of parent taxon

two lobed spineflower, two-lobe spineflower
Habit Plants prostrate to spreading or erect, mostly thinly pubescent.
Stems

sometimes disarticulating at each node.
Leaf

blades linear to lanceolate, obovate, round, or spatulate.
Inflorescences

bracts mostly 2, opposite, scalelike or if leaflike then similar to basal leaves only reduced, occasionally deciduous in early anthesis, with or without awns.
Involucres

cylindric to narrowly turbinate, campanulate, or urceolate, occasionally ventricose basally, 3-,5-, or 6-toothed, with or without membranous or scarious margins;

teeth erect to spreading or divergent, connate at least 1/2 their length, typically shallow, mostly unequal, with alternating long and short awns, often with anterior one longest.
Flowers

1(–2), white to pink or rose, maroon or purple, or yellow, thinly pubescent at least along midribs abaxially;

stamens 3–9;

filaments adnate at base of floral tube or faucially;

filaments sometimes connate into short tube.
Outer tepals

deeply 2-lobed, occasionally erose apically.

Achenes

brown, lenticular or globose-lenticular, or 3-gonous.
Seeds

embryo straight or rarely curved.
2n

= 40.

Chorizanthe biloba var. biloba

Chorizanthe subg. Amphietes
Phenology Flowering May–Aug.
Habitat Sandy, gravelly or clay soils, grassland communities, pine-oak woodlands
Elevation 200-700 m (700-2300 ft)
Distribution
from FNA
CA
[BONAP county map]
w United States; nw Mexico; sw South America
Discussion

Variety biloba is found from the eastern foothills of the Santa Lucia Mountains of Monterey and San Luis Obispo counties eastward to the western foothills of the Diablo, La Panza, and Temblor ranges, and in extreme western Fresno County.

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

Species 39 (31 in the flora).

Most species of subg. Amphietes are found in California. Of the others, one is known only from southernmost Peru to central Chile (Chorizanthe commissuralis J. Rémy), while the rest are known only from Baja California, Mexico. Those include C. inequalis S. Stokes, C. turbinata Wiggins, C. mutabilis Brandegee, C. rosulenta Reveal, C. pulchella Brandegee, C. flava Brandegee, and C. interposita Goodman. The latter is the only member of sect. Clastoscapa, the only section of subg. Amphietes not found in our flora.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 5, p. 458. FNA vol. 5, p. 450.
Parent taxa Polygonaceae > subfam. Eriogonoideae > Chorizanthe > subg. Amphietes > sect. Ptelosepala > Chorizanthe biloba Polygonaceae > subfam. Eriogonoideae > Chorizanthe
Sibling taxa
C. biloba var. immemora
Subordinate taxa
Name authority unknown Reveal & Hardham: Phytologia 66: 113. (1989)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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