BUCKWHEAT FAMILY 



391 



Involucral tube suleate, its tooth 5, equal; bracts small 25. C. insigiiis. 



Involucre with spurs at base. 



Spurs G, spiue-like; involucral teeth uncinate 26. C. lepioceras. 



Spurs 3, saccate, each about as large as involucral tube ; involucral teeth straight 



27. C. thurieri. 



1. C. membranacea Benth. (Fig. 67a.) Erect, Vo to IY2 feet high, mostly 

 simple below, ouce to thrice dichotomous above, the involucres in solitary 

 capitate clasters along the branches or mostly terminal; herbage lanate, floecose 

 in age, the upper surface of the leaves glabrate ; leaves linear, sessile, or grad- 

 ually narrowed into a short petiole, i-o to I14 inches long; involucres urn- 



Fig. 67. Involucres of Chorizaxthe. a, C. membranacea Bonth.; h, C. 

 XORTOXI Greene; c, C. PUXGEXs Benth. x .5. 



shaped, !]■_< to 2 lines long, wholly white-scarious l)etween the awned teeth, 

 or some involucres, especially solitary ones in the lower forks, wholly desti- 

 tute of membranous border; awns slender, uncinate, and strongly divergent; 

 flowers 2 or 3, uneciually pedicelled, of these 1 or 2 undeveloped or obsolete; 

 calyx woolly, its segments obovate or spatulate, the inner narrower, all clawed, 

 united only at very base ; stamens 9. 



Coast Ranges, mostly towards the interior from Tehama Co. south to the 

 Santa Inez Mts. ; Sierra Nevada, in the foothills and lower part of the Yellow 

 Pine belt. May-June. 



Locs. — Salt Creek, Tehama Co., Jepson; Scotts Valley, Lake Co., Traci/ 1657; Napa Eange, 

 Jepson; Vacaville, Piatt; Mt. Diablo, Jepson; Crystal Springs, San Mateo Co., Bolander; 

 Mt. Day, Santa Clara Co., B. J. Smith; Big Sur Biver, Davy 74.35; San Antonio Trail, Santa 

 Lucia Mts., Jepson 1665; Estrella, Jared; Santa Inez Mts., Dunn; Old Colony Mill, K 

 Brandegee, Jepson 6.33; Toll House, Fresno Co., SaU ^- Chandler 31; Yoseniite, E. J. Smith; 

 Bowers Cave to Hazel Green, Jepson; Sheep Ranch, Calaveras Co., Davy 1610. 



Refs. — Chorizaxthe memuranacea Benth. Trans. Linn. Soc. 17: 419, t. 17, fig. 11 (1837), 

 type from California, Douglas; Jepson, Fl. W. Mid. Cal. ed. 2, 129 (1911). 



2. C. nortoni Greene. (Fig. 67b.) ^Mostly 1-stemmed, 2 or 3-forked, or 

 sometimes many-stemmed from base, 4 to 7 inches high, the involucres con- 

 gested in terminal heads; leaves oblanceolate, 1 to 1% inches long; lower 

 bracts foliaceoiis, the upper reduced ; herbage hair.y ; involucres reddish, 

 cylindrie-urnshaped, 6-ribbed, margined by a broad scarious purple 6-lobed 

 border ; lobes unequal, the 3 larger triangular in outline, the 3 alternate often 

 small or obsolete, all ending in a short uncinate awn ; some earlier involucres 

 solitary in the forks and these destitute of scarious margin ; calyx rose-color, 

 little exserted, its short oblong lobes equal, undulate-erosulate; stamens 6. 



^Mountains bounding the Salinas Valley and westward to the Pacific Ocean. 

 June. Involucres often reticulate between the ribs. 



Locs. — Big Sur, Davy 1431; Santa Lucia Creek, Jepson 4732; Burro Trail, Santa Lucia 

 Mts., K. Brandegee; Bitterwater, Eastwood; Estrella, Jarrd. 



Ref. — Chorizaxthe xortoxi Greene, Pitt. 2: 164 (1891). type loc. Gonzales, A. Norton. 



3. C. stellulata Benth. Stem erect, trichotomously branched, mostly above 

 the base, 4 to G inches high, the involucres in eymose clusters or somewhat cap- 

 itate ; herbage hairy ; leaves linear, acute, sessile, 5 to 8 lines long, in a rosette 



