Chorizanthe brevicornu Torr.  
Family: Polygonaceae
brittle spineflower,  more...
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Shannon Doan  
Plants spreading to erect, 0.5-3(-5) × 0.5-3 dm, thinly pubescent, often with appressed hairs, infrequently somewhat strigose or glabrate. Leaves basal; petiole 0.5-2 cm; blade oblanceolate to narrowly elliptic or spatulate, (1-)1.5-3(-4) × 0.1-1 cm, pubescent. Inflorescences green; bracts 2, similar to proximal leaf blades only more reduced, 0.3-1(-1.5) cm × 1-2.5 mm, becoming sessile and scalelike at distal nodes, linear, acicular, awns 0.2-0.5 mm. Involucres 1, green, 3-5 mm, not corrugate, thinly strigose; teeth divergent, 0.4-1.2 mm; awns uncinate, 0.2-0.5 mm. Flowers included; perianth greenish white to white or pale yellowish white, cylindric, 2-4 mm; tepals connate 3/ 4 their length, monomorphic, linear to narrowly oblanceolate, acute, entire apically; stamens slightly exserted; filaments distinct, 2-3.5 mm, glabrous; anthers white to pale yellow, ovate, 0.3-0.4 mm. Achenes dark brown, lenticular, 3-4 mm. Chorizanthe brevicornu has stems and branches that easily disarticulate at the nodes. Dried specimens often are reduced to a mere jumble without careful handling. The vegetative fragments will not regenerate new plants, but the involucres (each with a single flower bearing a single achene) easily disarticulate from the parent plant, and with the aid of the awns on the teeth of the involucre, may be readily distributed.

References: Arizona Flora, Phytologia (Vol.66, No.2, May 1989).J.C. Hickman, ed. The Jepson Manual.ASU specimens.
Chorizanthe brevicornu image
Shannon Doan  
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Gregory Gust  
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Gregory Gust  
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Gregory Gust  
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Gregory Gust  
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Patrick Alexander  
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Patrick Alexander  
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Patrick Alexander  
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Eugene, (Gene) Sturla  
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Patrick Alexander  
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Sue Carnahan  
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Sue Carnahan  
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Mark Dimmitt  
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Sue Carnahan  
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