56 DAVENPORT ACADEMY OK NA'IT'RAI. SCIENCES. 



divergent, rigidly straight awned, the upper internal face hispid-hairy, 

 occasionally one or two smaller intermediate ; flowers pedicellate, 

 partly exsert ; perianth deeply parted, segments obovate entire, the 

 outer with a ciliate tuft at the tip : stamens 9 ; styles slender, recurved ; 

 cotyledons oval, as long as the radicle. 



Habitat : Dry, gravelly plains near San Bernardino to San Diego, 

 May. Less conspicuously red than the preceding. 



§5. ErcHORiZANiHE, Torr. &: (iray (exclude C. membranacca). In- 

 volucres cyHndric, divisions 5-6, more or less unequal, divergent, and 

 terminating in recurved awns, usually uncinate, rarely straight, with 

 margins occasionally scarious winged or naked ; tube angular and sul- 

 cate ; flowers short pedicellate or nearly sessile ; perianth more or less 

 exsert, rarely included, in a single case {C. Lastarruea ) obsolete ; seg- 

 ments usually une(iual, variously lobed, truncate, erose or laciniate; 

 stamens 9, occasionally 3-6, inserted on the base, or more or less 

 adnate to the tube, rarely on the throat ; styles usually long Hnear, with 

 capitate stigmas ; akene oblong triangular, narrowly winged. 



* Erect, dichotomously branched toward the summit, with irregular whorled 

 foliaceous bracts in the lower axils; c3'mes move or less condensed at the upper in- 

 ternodes, or on the naked terminal branches. 



+- Involucral divisions with scarious margins; perianth segments nearly equal. 



12. C. STEr,LUi,.ATA. Bcnth., Watson, 1. c. Slender, 3-6 inches high, 

 hairy-pubescent, somewhat umbellately branched from a short caudex, 

 corymbosely crowded above ; radical leaves short lanceolate, sessile 

 more or less pubescent and ciliate. an intermediate whorl of foliaceous 

 bracts on the lower stem and at the axils of the main branches; upper 

 cauline bracts acicular and ciliate ; involucres single in the lower axils, 

 cymosely clustered above, tube cylindric, sharply costate, smooth or 

 ciliate on the ribs ; divisions 6, nearly equal, with conspicuous scarious 

 margins (except in the lower axils), and short recurved uncinate awns ; 

 flowers short pedicellate, narrowly tubular ; i)erianth segments partly 

 exsert, nearly ec^ual, obcordately lobed and folded ; stamens 9, adnate 

 near the base ; styles slender, recurved ; akene narrowly triangular ; 

 embryo with green linear cotyledons and short radicle. 



Habitat: Abundant on volcanic rocks near Chico, May. 



13. C. Dou(Ji.Asii, Benth., Watson, 1. c. Stout, 2-18 inches high, 

 light green, densely pubescent, simi)le, or irregularly branching above, 

 with one or more foliaceous whorls on the main stem and lower axils ; 

 radical leaves oblanceolate, tapering to a narrow pedole ; ui)per invo- 



