484 BOTAFY. 



CHOEIZANTPIE. 



, Chilian species omitted. 



5 1. EXJCHOEIZANTHE, T. & G. Involucre tubular, 6-toothed, 6-ribt)ed, usually coriaceous, the 

 stout ribs terminating in a usually uncinate cusp or awn ; stamens inserted near the base of the 

 6-lobed calyx; leaves never cordate, entire, at least the canline narrow and attenuate at base. 

 Annuals ; Californian, with one exception. 



* Involucres in subcapitate clusters, the limb more or less white-scarious, (occasionally wholly 



herbaceous.) 

 (a.) The limb,, excepting the ribs, wholly petaloid-scarions, rotate-expanded, shortly 6-lobed ; stem 



erect; head dense. 



1. C. MEMBKANACBA, Bcnth. Webbed-wooUy ; leaves and bracts linear, with a weak mucro ; heads 

 solitary or few along the somewhat simple branches; involucre soarious above the base, the limb very 

 widely dilated, the stout ribs slenderly awned. 



2. C. STELLULATA, Bcnth. Eough-pubesceut, fastigiately branched ; cauline leaves nearly linear ; 

 bracts acerose, pungently awned, hirsute ; heads subcymose ; involucre-tube narrow, equally 6-ribbed, 2" 

 long, 4 times longer than the abrupt white-scarious limb ; the stout ribs slenderly awned ; calyx-seg- 

 ments obcordately 2-lobed ; anthers oblong-linear. — Only from Hartweg. 



3. C. DoHGLASii, Benth. Low, villous-pubesoent ; cauline leaves spatulate or lanceolate ; bracts 

 acerose, pungent ; heads usually umbellate, globose ; involucre-tube unequally angled, 2-3 times longer 

 than the short abrupt white or pinkish limb and the subulate unequal awns ; calyx-lobes truncate, sub- 

 crenulate ; anthers linear-oblong. 



(6.) Limb 5-parted, the segments scarious on the margin or wholly ; stems lax, branched from the 

 base, often diffuse ; pubescence more or less villous ; heads mostly irregularly panicled ; bracts 

 awned or pungent, the uppermost awn-like. A few solitary involucres often have the teeth wholly 

 herbaceous. 



4. C. DiPPtrSA, Benth. Slightly pilose, slender; leaves mostly radical, spatulate or oblong-ovate; 

 clusters small, rather loose; involucre 1" long or less, the ovate teeth scarious excepting the midribs, 

 1 or 2 of the unequal awns equaling the tube ; anthers oval. 



5. C. PUNGENS, Benth. Softly hirsute-villous, the stems mostly spreading, branched, and leafy 

 below ; leaves spatulate or sublanoeolate ; clusters irregular ; involucre li-2J" long, the unequal ovate 

 or ovate-subulate teeth herbaceous at base, more or less scarious-margined, the larger teeth and bracts 

 longer awned ; anthers oblong. 



* * Only the sinuses of the involucre scarious, the teeth wholly herbaceous or coriaceous, often 



horn-shaped; involucres in crowded cymelets or clusters, (in C. Irmicornu loosely panicled,) those 



in the forks solitary ; stamens 9, in the last two species but 3. 

 (a.) Calyx-segments pectinate-fimbriate below the apex; erect; leaves all radical, spatulate and 



oval; peduncle naked, cymose with repeatedly dl-trichotomous divisions ; bracts acerose-subulate ; 



flowers sessile in the involucre. 



6. C. LACINIATA, Torr. Dwarf, subvillous, many-flowered ; teeth of the involucre subulate-awued, 

 nearly equal, 2-4 times shorter than the tube ; calyx twice exceeding the involucre, segments triangu- 

 lar-lanceolate, long and densely fimbriate, tailed at the apex.— Found only by Antisell. 



7. C. EiMBRiATA, Nutt. Low, subvillous or nearly glabrous ; the stout subulate awned teeth a little 

 shorter than the involucre-tube ; calyx less exserted, the segments irregulariy lacerate-fimbriate below 

 the oblong obtuse apex. 



(J.) Segments of the calyx entire or only orenulate at the apex ; stems somewhat naked. 



8. C. STATicoiDES, Benth. Erect, 2-12' high; leaves mostly radical, spatulate, oblong or rounded 

 hu-sutish, subtomentose beneath; cyme loosely corymbose; involucral teeth subulate, shortly awned 

 unequal, the larger 2-3 times shorter than the narrow tube, ' 



9 C. PKOCUMBBNS, Nutt. Depressed and diffuse, subhirsute ; leaves spatulate ; cymelets irregulai-lv 

 panicled; teeth horn-shaped, subulate-awued and usually uncinate, the 2-4 larger ones a little shorter 

 than the (1" long) tube. 



pubestn; w!tr'^' '"; f ^;,^^f ^«' ^;*^ ^ «°^* S-^-yi^li pubescence; leaves spatulate, pilose- 

 pubescent beneath; cymelets rather loose; bracts awned; teeth horn-shaped, one terminated with a 

 stout straight awn longer than the short-oblong tube, the rest short- cuspid ate Brewer ) 

 .oJ ?■ f ^T'°°?^^' Torr. Leaves linear or obovate-spatulate ; involucres narrow, prismatic mostly 

 scattered; teeth subequal, recurved ; calyx-lobes entire. See page 312 pnsmano, mostly 



