BLAKE. — ENCELIA AND RELATED GENERA. 369 



C. F. Pond (N). — Often confused with E.Jrutcsccns Gray, from which 

 the purple disk at once distinguishes it. 



o o Leaves canescent or tomentose; involucre not densely tomentose; plants 

 of South America (except one species of Lower California, with cordate 

 leaves). 



+ Leaves cuneate or rounded at base; plants of South America and the 

 Galapagos Islands. 



— Pubescence usually soft; heads (except in starved specimens) long-pe- 

 duncled; South American. 



9. E. CANESCENS Lam. Suffrutescent below, suberect, canescent 

 with a rather soft pubescence, the stem about 6 dm. long; leaves 

 broadly ovate, rounded at base, obtuse or rounded at tip, canescent 

 with a soft pubescence, 2.5-5 cm. long, L6-3.5 cm. broad, on petioles 

 0.5-2 cm. long; inflorescence few-headed, terminal, the heads racemose 

 or corymbose-panicled ; disk 1-L5 cm. in diameter; involucre 5-7 mm. 

 high, its rather loose bracts lanceolate to lance-ovate, somewhat tri- 

 seriate, tomentose; rays about 12, broadly oval, faintly 2-3-lobed, 

 7 mm. long; disk-corollas 4.5 mm. long, the short tube glandular, the 

 teeth hairy; pales 8 mm. long, glandular-hairy on the back; achenes 

 6 mm. long, 2.7 mm. wide, blackish with narrow white villous margin, 

 pilose down the middle of the sides, awnless. 



Encelia canescens Lam. Encycl. Method, ii. 356 (1786); Cav. Icon, 

 i. 45. t. 61 (1791). 



Coreopsis Urn ensis J acq. Coll. ii. 299 (1788), & Icon. PI. Rar. iii. t. 

 594 (1786-1793). 



EnscUa Umcnsis Jacq. Coll. 1. c. 300; Encelia limcusis Steud. Nom. 

 ed. 2. 420 (1840). 



PaUasia haUmifoIia L'Her. in Ait. Hort. Kew. iii. 498 (1789). 



Encelia alternifolia Raeuschel, Nom. ed. 3. 251 (1797). 



Eucalia canescens Raeusch. 1. c. (1797). 



Specimens examined: Peru: dry seacoast, Payta, Col. Hall (G); 

 Lima and San Lorenzo, Gaudichaud 112 (G) ; without definite locality, 

 Domhey (G), McLean (G); Wilkes Expl. Exp. (N), approaching var. 

 oblong if olia; Chili: sandy places, Copiapo, Sept. 1854, Lcchler 2H01 

 (G). — Passes into the following varieties. 



9/3. E. CANESCENS Lam. var. parvifolia (HBK.) J. Ball. Pubes- 

 cence denser, almost tomentose; leaves rhombic-ovate or ovate-lanceo- 

 late, cuneate at base, acute or subacute at tip; achenes rather more 

 hairy. 



Encelia parvifolia HBK. Nov. Gen. iv. 206 (1820). 



