28 PROCEEDINGS OF THE AMERICAN ACADEMY. 



17. C. trichotoma, Donuell Smith. Densely fuscons-toraentose: 

 leaves ovate, acutish, crenate-serrate, scabrous above, somewhat canes- 

 cent-tomentose beneath, 1 to 2} inches long, one half to two thirds as 

 broad ; stems somewhat tortuous as though scaudeut. — Bot. Gaz. xiii. 

 299. — Rocky mountain sides near Cohan, Dept. Alta Verapaz, altitude 

 4,300 feet, voM Tuerckheim (no. 1353 of Donnell Smith's sets); Chiapas, 

 table land about Ocuilapa, altitude 3,400 to 3,800 feet, E. W. Nelson, 

 no. 3004. 



*-*■ ++ Heads campanulate, many-flowered : scales of the involucre glabrous : leaves 

 very large (2^ inches or more in breadth) : pedicels less than an inch in 

 length : Costa Rican species. 



18. C. pellncidinervia, Klatt. Leaves membranaceous, broadly 

 ovate, 4 inches long, two thirds as broad, long-acuminate, serrate-dentate, 

 rounded at the base ; petiole 5 lines long, densely pilose : ligules 6, 2 lines 

 in length. — Bull. Soc. Bot. Belg. xxxi. 207. — In woods at Terraba, 

 altitude 900 feet, Pittier, nos. 3707, 3726. A species not seen by the 

 writers ; the description is condensed from the original characterization. 

 ++++++ Heads campanulate, many-flowered : scales of the involucre multlseriate, 



sub-herbaceous, very pubescent : pedicles half inch or less in length : leaves 

 smaller : Mexican species. 



19. C. scabrifolia, Benth. & Hook. f. Shrub: leaves ovate- 

 oblong or oblong-lanceolate, attenuate, serrate or serrulate, thickish 

 above papillose-pubescent and very scabrous, below sparingly pubescent, 

 slightly paler and with veins very prominent : pedicels and iuvolucral 

 bracts densely canescent-tomentose : disk-flowers 125 or more; ray- 

 flowers 20 to 25, the latter without pappus: plant drying green. — Benth. 

 & Hook, f. ace. to Hemsl. Biol. Centr.-Am. Bot. ii. 206. Allocarpus 

 scabnfolius, Hook. & Arn. Bot. Beech. 300. Ferdinanda oppositifoUa, 

 Schz. Bip. in Seeraann, Bot. Herald (by error cited as Zaluzania by 

 Benth. & Hook. f. Gen. ii. 391). Perymenium album, Wats. Proc. Am. 

 Acad. XXV. ■■ 54. — N. W. Mexico in Sierra Madre, Seemann ; Jalisco, on 

 mountains near Lake Chapala, Pringle, no. 2438, in fl. December ; 

 Alamos, Palmer, no. 283. 



20. C. submembranacea, Fernald. Similar in habit: leaves 



thinner, nearly smooth and somewhat lucid, somewhat nigrescent in 



drying. — Bot. Gaz. xx. 535. — • On mountain sides, Zopelote, Tepic, 



altitude 3,000 feet. Lamb, no. 554. 



+++*++++ Heads few ; campanulate : scales of the involucre broad, few-seriate, 

 glabrous: pedicels very long (1| to 2 inches) : plant essentially glabrous. 



21. C. longipedicellata. Shrub, glabrous throughout except the 

 puberulent summits of the long pedicels: leaves elliptical, acutish at both 



