358 PROCEEDINGS OF THE AMERICAN ACADEMY. 
ENCELIA Adans. (to Christopher Encel, who published a work on | 
oak-galls in 1577).— Heads small or medium, radiate or rarely discoid, 
flowers yellow or purple. Involucral scales 2-3-rowed, subequal or 
the outer shorter, lanceolate to ovate-lanceolate. Receptacle convex; 
pales scarious, soft, embracing the achenes and falling with them. 
Rays entire or 2-3-toothed or -lobed, yellow, rarely absent; disk- 
corollas with short tube and usually cylindric-funnelform throat, the 
limb hairy and 5-toothed. Style-branches obtuse, short-pubescent 
outside. Disk-achenes compressed, very flat, oblong or obovate, 
villous on margins and glabrous or pubescent on the sides, narrowly 
white-margined, usually pappusless but in some species with two 
slender upwardly pubescent awns.— Alternate-leaved generally pubes- 
cent perennials, sometimes frutescent, with solitary to paniculate 
heads of usually yellow flowers. Type species E. canescens Lam.— 
About 14 species of western America, in arid regions and on the sea- 
coast, from Nevada to Lower California and central Mexico, and again 
from Peru to central Chili; one species on the Galapagos Islands. 
Encelia Adans. Fam. ii. 128 (1763). 
Pallasia L’Hér. [“ Diss. (1784)”] in Ait. Hort. Kew. iii. 498 
(1789), not of Houtt. 1775, nor Scop. 1777, nor L. fil. 1781, nor 
Klotzsch 1853 (the last a valid genus of Rubiaceae, the others all 
synonyms of various genera). 
Eucalia Raeuschel, Nom. ed. 3. 251, 385 (1797), a nomen nudum. 
Enchelya Lem. in Orb. Dict. Hist. nat. v. 300 (1844). 
Encelya and Enchelia Baillon, Dict. Bot. ii. 517 (1886). 
KeryY TO THE SPECIES OF ENCELIA. 
A. Suffrutescent, leaves laciniately lobed. 
So Leaves Weeks: aa 1. E. ventorum. 
B. Lea OVMG 5S a AES LE a ts 2. E. laciniata. 
A. Leaves linear, | 
B. Hea icled; plant TOUR. oS ks hes va ee E. stenophylla. 
B. Heads solitary; Geil ycikernmed; leaves saison * eee 
12. E. angustifolia. 
B. Heads solitary; scapose; leaves puberulent both sides. 
5 13. EH. scaposa. 
A. Leaves oblong to ovate, unlobed. 
B. Heads paniculate, numerous; branches of inflorescence sa us. 
3. E. farinosa. 
B. a few or solita uncles pubescent. 
Ce manwe ie ype are 11. E. Palmeri. 
C. pote rounded or cuneate at base. 
D. Shrubby; disk yellow. 4. E. frutescens. 
5. BE.  albescens. 
