456 COMPOSITiE. 



narrowly linear lobes: heads small, narrowly spicate-clustered on the 

 upper parts of the stem and branches; involucral bracts ovate, scarious- 

 margined, nearly glabrous. — Eastern slope of the Sierra, thence eastward 

 in Nevada. A very pleasantly fragrant herb. 



8. A. Ludoviciaua, Nutt. 1. c. Completely and somewhat flocculently 

 white-tomentose, 1 — 2 ft. high, simple, or with some virgate branches: 

 leaves of firm texture, oblong to linear-lanceolate, mostly undivided and 

 entire, sometimes 2 — 3-cleft: heads very small, glomerately paniculate: 

 involucre campanulate in flower, ovoid in fruit.— From Monterey south- 

 ward. July — Oct. 



* * * Canescent or silvery-foliaged shrubs, the leaves usually loothed but 



not divided. 



9. A. arbiist'iiia, Nutt. Trans. Am. Phil. Soc. vii. 398 (1841). Sel- 

 dom a foot high, the many erect stems from a stout woody base: leaves 

 short, cuneate-flabelliform, 3-lobed or parted, the lobes obovate to 

 spatulate-linear, occasionally themselves 2-lobed, those nearest the heads 

 mostly narrow and entii-e: panicle strict and simple, often spike-like and 

 with few heads: involucre 5 — 9-flowered. — Near the summit of the 

 Sierra, and on its high easterly slopes. Aug.~Oct. 



10. E. trideiitata, Nutt. 1. c. Larger shrub, often 4—8 ft. high, 

 much branched: leaves cuneate, obtusely 3-toothed or lobed at the trun- 

 cate summit, the uppermost cuneate-Jinear: heads small, very numerous 

 and densely paniculate: involucre 5— 8-flowered, its smaller outer bracts 

 short, ovate, tomentose-canescent.— Eastern slopes of the Sierra Nevada. 

 Aug.— Oct. 



11. A. Bolaiideri, Gray, Proc. Am. Acad. xix. 50 (1883). Smaller, at 

 most only 1—2 ft. high, the pubescence somewhat scurf y-tomeutose, 

 heads rather large: leaves narrowly linear, acutish, entire, or some with 

 one or two slender lobes: heads very many, densely glomerate- 

 paniculate, about 14-flowered, often quite surpassed by one or two 

 linear-subulate herbaceous accessory bracts. — Bare or local species, at 

 Mono Pass in the Sierra Nevada, Bolander. 



12. A. Rothrockii, Gray, Bot. Calif, i. 618 (1876); Botbr. in Wheeler's 

 Exp. 366. t.* 13. Less canescent than the foiegoing, 1 ft. high or less: 

 leaves from cuneate and obtusely 3-lobed to spatulate lanceolate, or the 

 uppermost linear, sometimes all entire: heads middle-sized, glomerate- 

 paniculate, 9 — 12-flowered: bracts of the involucre all ovate or oval, 

 glabrate.— Southern part of the Sierra Nevada, in Tulare Co. and east- 

 ward. 



