ROBINSON AND GREENMAN. — GENUS GALEA. 21 



serrate or dentate, rarely entire (in one or more S. American species 

 piuuatifi(l). Tiie limits of the genus here taken are essentially those of 

 Beutham & Hooker (Gen. ii. 390), and Hoffmann (in P^ngl. & Prautl, 

 Nat. Pflanzenf. iv. Ab. 5, 246), whose generic synonymy need not here 

 be repeated. The Mexican and Central American species may be sub- 

 divided according to the following characters. 



Subgenus 1. Leontophthalmum, Benth. & Hook. f. Heads very 

 large (inch or more in diameter), radiate, few or solitary, long-peduncled : 

 scales of the involucre few-seriate, broad, the outer often herbaceous : 

 both disk- and ray-flowers yellow : scales of the pappus numerous. — 

 Gen. ii. 391. Leontophthalmum, Willd. Gesellsch. Natur. Fr. Berl. Mag. 

 1807, 40 ; HBK. Nov. Gen. & Spec. iv. t. 409. — Mostly S. American 

 species, only the following known from Mexico. 



1 . C. megacephala. Erect, herbaceous, 2 or 3 feet high : stem 

 striate-angulate, hirsute-pubescent, leafy to the middle and terminating 

 in one or (more rarely) three long naked 1-headed peduncles (often 18 

 inches in length) : leaves thin, ample, hirsute upon both sides, rhombic- 

 ovate or with deltoid acute or obtusish coarsely dentate blade (3 to 4 

 inches long, nearly as broad) abruptly contracted at the base, then grad- 

 ually attenuate into a winged entire petiole of nearly equal length ; the 

 lowermost leaves smaller, obovate, and with rounded apex: heads, exclu- 

 sive of raj^s, 9 to 12 lines in diameter: flowers deep orange; ray-flowers 

 15 to 20, with oblong spreading ligules half inch in length: disk conical. 

 — Collected by E. W. Nelson at Sta. Efigenia, Oaxaca, altitude 500 feet, 

 18 July, 1895, no. 2844, and on top of ridge back of Tonala, Chiapas, 

 altitude 1,200 to 2,500 feet, 10 August, 1895, no. 2884. A plant with- 

 out close affinities in the Mexican species of the genus, but related to 

 several of the S. American. 



Subgenus 2. Oteiza, Llav. (as gen.). Heads few or solitary, large, 

 9 to 15 lines in diameter, loosely cymose or (in C. elegans) somewhat 

 densely grouped at the ends of the branches : rays long (nearly or quite 

 half inch in length) white or roseate : leaves sessile or nearly so. 



* Leaves oblong, narrowed at tlie base. 



2. C. Palmeri, Gray. Herbaceous, erect or slightly decumbent : 

 stem simple or divided almost from the base, pubescent, 18 inches to 2 

 feet high : leaves 2 to 3 inches long, 4 to 6 lines broad, denticulate and 

 ciliated, 3-nerved : heads 1 to 9, in terminal loose cymes ; slender pedun- 

 cles nearly naked ; the floral leaves short and linear : involucral bracts 

 green, few-seriate and more nearly equal than is usual in the genus. — 

 Proc. Am. Acad. xxii. 430. — On the Rio Blanco, Jalisco, Palmer^ no. 



