374 COMPOSITE. Artemisia. 



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

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



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

 at base: habit of the following section. 



A.. Bigelovii, GRAV. Silvery-cauescent throughout, a foot high: leaves from oblong- to 

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

 numerous and crowded in the oblong or virgate thyrsiform panicle, tomeutose-cauescent, 

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

 R. Rep. iv. 110. Rocky banks and callous, Colorado, on the Upper Canadian and Arkansas, 

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



3. SERIPI-IIDIUM, Bess. Heads homogarnous, 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 anthesis, as is common in the genus. 



A. Parish!!, GRAY. Frutesceut, 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 obloug-campauulate, canescent, 

 6 7-flowered : akenes sparsely arachnoid-villous ! Proc. Am. Acad. xvii. 220. Interior 

 of Los Angeles Co., California, Parish. 



A. Palmeri, GRAY. Wholly or nearly herbaceous, obscurely puberuleut ; but leaves white 

 beneath with close cottony tomeutnm, piunately 3-5-parted into long narrowly linear entire 

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

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

 flowers subtended by scarious-hyaline bracts of the receptacle ! Proc. Am. Acad. xi. 79, & 

 Bot. Calif, i. G18. 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 spiciform inflorescence, not 

 nodding even when young: corollas sometimes turning reddish. 



4 Foliuse-sjricate : heads solitary in the axils, surpassed by 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 campauulate, 5-1 2-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, NuttaU (without 

 flowers), Cusick. 



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

 tending leaves; these not rigid. 



H- 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. arbu.SCU.la, NUTT. Dwarf, a span or rarely a foot high, with a stout base and slender 

 flowering branches : leaves short, cuueate 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 spiciform and 

 reduced to few rather 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 plains, Wyoming and Utah to Idaho and the Sierra 

 Nevada, California. Two forms, passing into each other (both coll. by Nitttall, &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 G (or even 12) feet high, much branched: leaves 

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





