554 PROCEEDINGS OF THE AMERICAN ACADEMY. 



1- •*- -I- Leaves alternate or scattered. 



++ Fruiting lieads about 1 to 1.5 cm. in diameter. 



= Leaves not lepidote above. 



a. Scales of the involucre 8 to 10 mm. long : achene with a single small earlike 

 wing in the manner of Otopappus, or with two very unequal wings : Mexican. 



68. V. Robinsonii, Fernald iu herb. Otopapinis alternifolius, 

 Robinson, Pi'oc. Am. Acad. xxvi. 1G5 (1891); 0. Bohinsonii, Klatt, 

 Ann. Naturh. Hofmus. Wien, ix. oG2 (1894). — Limestone hills, San Jose 

 Pass, San Luis Potosi, Pringle, uo. 3310. While this species possesses 

 the typical pappus of Otopappus, its habit, and as we now believe its 

 genetic relationship, are nearer to Verhesina. The original specific 

 name, alternifolius, being preoccupied under Verbesina^ the species is 

 transferred under the next name. To this species may be referred, with 

 some doubt, V. Ilumholdtil, Klatt, Leopoldiua, xx. 92 (as to pi. Mex.), 

 not Spreng. V. ITumholdtli, Spreng. ( F. helianthoides, HBK. Nov. 

 Gen. &, Spec. iv. 204), is supposed to be Ecuadorian and is described by 

 Ivuuth as having leaves glabrous above, which is not the case here. 



h. Scales of the involucre about 1 cm. long: Bolivian. 



69. V. ciNEREA, Rusby, Mem. Torr. Club, vi. 63. — Near Cocha- 

 bamba, Bolivia, Bamj, no. 1092. 



c. Scales of the involucre about 7 mm. long : E. South American. 



70. Y. SORDESCENS, DC. Prodr. v. 613 ; Baker in Mart. Fl. Bras, 

 vi. pt. 3, 214, and var. seinlserrata (=V. semiserrata, Sch. Bip. in 

 herb. ace. to) Baker, 1. c. — ^tslzW, Riedel, and others; Central Para- 

 guay, Ilorong, no. 628a. 



d. Scales of the involucre 4 to 6 mm. long: wings of the achenes usually sub- 

 equal : leaves serrate or serrulate : Mexican. 



1. Leaves green and closely appressed-puberulent (not scabrous) beneath. 



71. V. chiapensis. Branchlets striate, appressed-puberulent, at 

 length gjabrate and smooth; internodes rather long: leaves lance-oblong, 

 mucronulate-serrulate, attenuate at each end, subglabrous above, scarcely 

 paler and finely appressed-puberulent beneath, pinnately veined, becom- 

 ing 2 dm. long, 6 cm. broad: corymb 20-30-headed, 1.5 dm. broad; 

 heads 1.2 cm. in diameter excluding the linear-oblong spreading deep 

 yellow rays (8 mm. in length) ; pedicels slender, 1 to 4 cm. long, covered 

 with short but copious somewhat spreading pubescence; scales of the 

 involucre sub-uniseriate, ovate-oblong, acutish, 3 to 4 mm. long, much 



