24 PROCEEDINGS OP THE AMERICAN ACADEMY. 



Var. livida. Leaves narrow, lanceolate to lance-oblong, very sca- 

 brous-pubescent : iuvolucral scales dark purple : pajjpus present. — C. 

 peduncularis, var. hngifolia, Gray, as to pi. Palmer. — On the Rio 

 Blanco, Jalisco, Palmer^ no. 317 ; and in damp shady canons near 

 Guadalajara, Primjle^ no. 2326 ; fl. August to October. 



8. C. Liebmannii, Schz. Bip. Branches terete : leaves petiolate, 

 ovate-elliptic, 2 inches long, 9 lines broad, coriaceous, 3-nerved, glabrous 

 above, ferrugineous and chrysopunctate beneath : heads short-pedicelled, 

 6-flowered, disposed at the summits of the peduncles in umbelliform 

 corymbs : involucres cylindraceous : scales 3-seriate, ovate, subreflexed at 

 the apex : chaff membranaceous, ovate, acute : achenes glabrous ; scales 

 of the pappus 10, short. — Leopoldina, xxiii. 6. — GnalulM, Li ehmann, 

 no. 411. Not seen by the writers, and doubtfully referred to this subdi- 

 vision. The characters are drawn from the original description of Klatt. 



* * Inflorescences more numerous, short-peduncled or sessile, together 



forming leafy panicles. 

 •4- Pappus-scales rather few, ovate to lanceolate, shorter than the achenes. 



*•*■ Inflorescences lax, somewhat umbelliform : pedicels slender and relatively long, 

 most of them considerably exceeding the heads in length. 



9. C. salmesefolia, Hemsl. 1. c. Shrub, 2 to 3 feet high with 

 rhombic-ovate leaves acute at both ends, smoothish and lucid above, 1 to 

 li inches long, half as broad: heads 8-14-flowered. — Cnlydermos 

 salmecefoliiis, DC. Prodr. v. 670. — Between Tula and Tampico, Ta- 

 maulipas, Berlandier, nos. 718, 2135. 



*+ *+ Inflorescence denser : pedicels mostly very short, seldom equalling or exceed 

 ing the heads (except in C. Zacatechichi, var. macrophiiUa). 



= Involucre of most or all of the heads closely subtended by a few broad obtuse 



herbaceous bractlets. 



10. C. albida. Gray. A branching pubescent shrub: leaves ovate, 

 shortly petiolate, serrate, acutish at the apex, abruptly contracted at the 

 broad obtuse base, scabrous above, somewhat paler and moderately pubes- 

 cent below, 1 to li- inches long, two thirds as broad: heads numerous, 

 cymosely clustered at the ends of the leafy branches, on pedicels 1 to 9 

 lines in length, homogamous or with one or more reduced ray-flowers ; 

 flowers whitish : achenes pubescent, scales of the pappus acute. — Proc. 

 Am. Acad. xv. 38. — San Luis Potosi, in mountains near Morales, 

 Schnffner, no. 269, and later in the same state. Parry S)- Palmer, no. 

 448 ; in fl. in August. 



11. C. hypoleuca. Similar in habit : leaves somewhat larger, 

 broadly ovate or suborbicular, sessile or very shortly petioled, scabrous 



