374 COMPOSIT.E. Artemisia. 



Described by Besser from herb. Lindl., here from herb. Hook. A peculiar and little known 

 species, to which Douglas had applied the appropriate name of A. leptopJiijUa. 



•w- -H- -H- -H- -H- Heads small and narrow, very few- flowered: flowers glabrous: stems woody 

 at base: habit of the following section. 



^. Bigelovii, CiRav. Silvery-canescent throughout, a foot high: leaves from oblong- to 

 liuear-cuueate, mostly 3-tootlied at the truncate apex, about half-inch long : heads very 

 numerous and crowded in the oblong or virgate thyrsiform panicle, tomentose-canescent, 

 containing only one or two hermaphrodite and as many female flowers, all fertile. — Pacif. 

 R. Rep. iv. 1 10. — Rocky banks and cauons, Colorado, on the Upper Canadian and Arkansas, 

 common where the latter leaves the mountains ; first coll. by Bigelow. 



§ 3. Seripiiidium, Bess. Heads liomogumous, the flowers all hermaphrodite 

 and fertile : receptacle not hairy. — Gray, Proc. Am. Acad. xix. 49. 



* Anomalous species of Southwestern border, tall, mainly herbaceous, 3 to 5 feet high, with ample 

 and naked compound panicles; the heads nodding in antliesis, as is common in the genus. 



A . Parishii, Gray. Frutescent, ciuereous-puberulent : leaves linear and entire, below pass- 

 ing into elongated slender-spatulate and with 3-toothed apex : panicle a foot or two long, 

 loose: heads mostly pedicellate (2 lines long): involucre oblong-campanulate, canesceut, 

 6-7-flowered : akeues sparsely arachnoid-villous ! — Froc. Am. Acad. xvii. 220. — Interior 

 of Los Angeles Co., California, Parish. 



A.. Palmeri, Gray. Wholly or nearly herbaceous, obscurely puberulent ; but leaves white 

 beneath with close cottony tomentum, pinnately 3-5-parted into long narrowly linear entire 

 lobes, their margins revoluto : heads glomerate on the branches of the open panicle, hemi- 

 spherical, less than 2 lines in diameter : involucre greenish, about 20-flowered ; many of the 

 flowers subtended by scarioushyaline bracts of the receptacle ! — Proc. Am. Acad. xi. 79, & 

 Bot. Calif, i. 618. — Jamul Valley, 20 miles south of San Diego, on the borders of California 

 and Lower California, Palmer, Miss Bird. 



* * Sage-brush or Sage-bushes, low shrubs, or fruticulose, canescent or silvery with very fine 

 and close tomentum : heads glomerate or strict in the paniculate or spicifonu inflorescence, not 

 nodding even when young: corollas sometimes turning reddish. 



•i— Foliose-spicate : heads solitary in the axils, surpassed b}' the rigid leaves. 



A., rigida, Gray, a span to a foot high from a thick woody base or short stem, producing 

 a profusion of rigid and slender rather simple fastigiate branches, leafy to the very top : 

 leaves also rigid, silvery-canescent, filiform-linear, 3-5-parted or cleft, or some of the upper 

 and fascicled ones entire (even the lower rarely inch long), most of them subtending a sessile 

 head: involucre oblong to campanulate, 5-12-flowered, less than 2 lines long; bracts oval, 

 hyaline-margined. — Proc. Am. Acad. xix. 49. A. trijida, var. rigida, Nutt. Trans. Am. Phil. 

 Soc. vii. 398. — On high rocky ridges, N. E. Oregon and adjacent Idaho, Nuttall (without 

 flowers), Cusick. 



•i— -1— More naked-paniculate or thyrsoid, at least the upper heads or clusters exceeding the sub- 

 tending leaves ; these not rigid. 



++ Heads comparatively small and few-flowered, mostly oblong, one or two lines long: involucral 

 bracts rather firm in texture, well imbricated, the outer successively shorter: leaves seldom over 

 an inch long, mostly shorter. 



A. arbuscula, Nutt. Dwarf, a span or rarely a foot high, with a stout base and slender 

 flowering branches : leaves short, cuneate or flabelliform, 3-lobed or parted, with the lobes 

 obovate to spatulate-linear, sometimes again 2-lobed ; those subtending the heads usually en- 

 tire and narrow : panicle strict and comparatively simple and naked, often sjiiciform and 

 reduced to few i-ather scattered sessile heads : involucre 5-9-flowered. — Trans. Am. Phil. Soc. 

 1. c; Torr. & Gray, Fl. ii. 418; Eaton, Bot. King Exp. 182; Gray, Bot. Calif, i. 405.— 

 High mountains and elevated arid plaius, Wyoming and Utah to Idaho and the Sierra 

 Nevada, California. Two forms, passing into each other (both coll. by Nuttall, &c.); one 

 with involucre more campanulate, 7-9-flowered ; in the other oblong and only 4-5-flowered ; 

 sometimes the inflorescence simply spiciform, sometimes freely naked-paniculate. 



A. tridentata, Nutt. 1. c. Larger, 1 to 6 (or even 12) feet high, much branched: leaves 

 cmieate, obtusely 3-toothed or 3-lobed, or even 4-7 -toothed, at the truncate summit, upper- 



