BLAKE. — ENCELIA AXD RELATED GENERA. 367 



= = More herbaceous; leaves larger, generally canescent or white-tomentose; 

 involucral scales generally tomentose or canescent-pubescent. 



X Leaves green; scales mostly ciliate. 



7. E. HALiMiFOLiA Cav. Suffrutcscent, branched, apparently 

 diffuse, the stems, young branches, and in a less degree the peduncles 

 canescent with fine incurved hairs; leaves ovate, acute or obtusish, 

 cuneate or nearly truncate at base, entire or slightly repand-toothed, 

 somewhat pubescent with incurved hairs but not canescent, 2.5-3.5 

 cm. long, 1.2-2 cm. wide, on petioles a centimeter long; peduncles 

 axillary and terminal, simple or 2-3-branched, monocephalous, 

 nearly naked; heads 8 mm. high, 1.2-1.4 cm. wide excluding rays; 

 involucre 5-6 mm. high, the scales somewhat unequal, 2-3-seriate, 

 linear-lanceolate, glandular-ciliate; rays 10-12, broadly oval, barely 

 3-lobed, pubescent on tube and back; disk-corollas 4.5 mm. long, with 

 short tube, glabrous; pales 7.5 mm. long, glandular-pubescent on 

 back; immature achene 3.6 mm. long, villous on margin, otherwise 

 nearly . glabrous. 



Encelia halimifoUa Cav. Icon. iii. 6. t. 210 ("1794" = 1795). 



Pallasia grandiflora Willd. Sp. PI. iii. 2261 (1804). 



Specimens examined: Sonora: Yaqui River, 1869, Palmer 12 

 (FGN). There is also a sheet in Gray Herb, (ex herb. Klatt) labeled 

 "Ex horto Scholae centralis Monspeliensis. Mexico? Peruvia!" 

 but the specimen is doubtless from Mexico. 



X X Leaves canescent or tomentose, or involucre densely pubescent. 



o Leaves green; involucre usually densely and softly tomentose; plants of 

 California and Lower California. 



8. E. CALiFORNiCA Nutt. Much branched, somewhat spreading 

 from a frutescent base, 6-10 dm. high, or on San Clemente Island 

 becoming 3-3.6 m. high, 2.5-10 cm. in diameter; stem and peduncles 

 canescent with fine incurved-spreading rather soft hairs; leaves from 

 lanceolate to ovate, acute, cuneate or rarely slightly rounded at base, 

 entire or somewhat repand-dentate, appressed-pubescent with soft 

 hairs but distinctly green, 3-6 cm. long, 1-3 cm. wide, on petioles 

 0.5-3 cm. long; peduncles long, terminal and axillary toward ends of 

 branches, nearly naked; disk 1.5-2.5 cm. in diameter; involucre 

 1-1.3 cm. high, the scales 2-3-seriate, lanceolate, densely tomentose; 

 rays oblong, 14-20, pubescent on tube and exterior, 1.5-3 cm. long; 

 disk-corollas 5 mm. long, glabrous or the teeth pubescent; pales 7.5- 

 10 mm. long, glandular-puberulent above; achenes 5.5-6 mm. long, 

 villous on margin and pubescent down the middle of each side, awnless. 



