

 Chorizanlhe. POLYGONACE^E. 35 



involucres scattered on the slender branches, 1| to 3 lines long, strongly angled and 

 sulcate, becoming corrugated, mostly 4-toothed : flowers a line long, pubescent, the 

 equal oblong perianth-segments laciniately fringed. Torr. & Gray, 1. c. 11)7. 



On dry hills in the Coast Ranges, from Stanislaus County (Brewer) southward ; Fort Tejon 

 (Xantus) ; on the Mohave River, Palmer. 



4. C. Calif ornica, Gray. Resembling the last, but somewhat more hirsute : 

 bracts more lateral, rarely perfoliate, and the disk more deeply lobed : involucres on 

 contracted branchlets and often clustered in the axils, more obtusely angled and not 

 sulcate, usually 2 - 3-toothed and 2 - 3-sided : segments of perianth obovate, entire. 



Torr. & Gray, 1. c. Mucronea Calif ornica, Benth. Linn. Trans, xvii. 419, t. 20. 

 In the Coast Ranges from San Luis Obispo to San Diego. 



2. Involucres coriaceous, ^flowered, Q-angled and -sulcate, the unequal divergent 

 teeth terminating in stout cusps or aivns, mostly uncinate : flowers nearly 

 sessile, included or only partially exserted, 6-cleft (rarely ti-parted), gla- 

 brous or bristly-villous on the midveins (rarely pubescent) : stamens 9 (rarely 

 3 or 6), mostly adnate to the tube near the base or below the middle : bract- 

 lets obsolete. More or less villous-pubescent or hirsute, not glandular, 

 fragile: bracts 1 to 3, distinct, often foliaceous, at least the uppermost 

 acicular-subulate : involucres usually more or less clustered or capitate. 

 EUCHORIZAXTHE, Torr. & Gray. 



* Involucres in close cymes (heads) ; margins of the teeth often scarious : stems 

 more or less leafy and the bracts mainly foliaceous. 



Margin of the involucre becoming wholly scarious and petaloid between the 

 awns (those in the forks marginless) : stem erect and heads dense. 



5. C. membranacea, Benth. Slender, floccose-tomentose, leafy, J to 2 feet 

 high, sparingly branched above, the branches ascending : leaves linear, scattered 

 along the stem, an inch or two long, acute : bracts mostly similar, cuspidate : heads 

 sessile, solitary or few upon the branches : involucres tomentose, 2 to 2| lines long, 

 with at length a broad dilated limb and equal uncinate teeth, the triangular tube 

 contracted in the middle : flowers villous, becoming 1 lines long, 6-parted : seg- 

 ments spatulate, the inner narrower and slightly shorter : stamens at the base : pedi- 

 cel equalling the flower. Linn. Trans. 1. c., t. 17, f. 11 ; Torr. & Gray, 1. c. 193. 



Central California, from Mendocino County to San Luis Obispo. The flower in this species is 

 that of the preceding section. 



G. C. Stellulata, Benth. Hirsutely pubescent, 3 to 6 inches high, umbellately 

 branched above : leaves linear-oblanceolate, scattered or the upper ones opposite, 

 an inch long or less : heads few and terminal ; the upper bracts broadly acerose 

 and coarsely hirsute : involucres 2 or 3 lines long, strongly 6-costate becoming tri- 

 angular, equally toothed, the margin not broadly dilated : flowers sessile, glabrous, 

 equalling the involucre, tubular, equally 6-cleft : the segments obcordately 2-lobed : 

 stamens adnate near the base. PL Hartw. 333, & DC. 1. c. ; Torr. & Gray, 1. c. 



Known only from Hartivcys specimens, collected in the " valley of the Sacramento." 



7. C. Douglasii, Benth. Resembling the last, but the leaves verticillate in one 

 or two whorls upon the stem : bracts setaceous, villous, purplish : involucres 1| 

 lines long, somewhat unequally toothed : flowers distinctly pedicelled, glabrous, a 

 line long, not cleft to the middle: the broadly cuneate-oblong segments truncate, 

 the outer cuspidate, the inner shorter and retuse : stamens adnate near the base. 

 DC. Prodr. xiv. 25; Torr. & Gray, 1. c. 



Collected only by Dour/las. Specimens from Santa Margarita Valley (501 & 893 Brcvw), 

 referred here by Torr. & Gray, 1. c., are probably distinct, being more slender and more softly 

 pubescent, and the stem naked excepting the 3 leafy bracts subtending 3 slender rays ; flowers 

 sessile, bristly-villous on the midveins, the longer segments scarcely mucronate. 



