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. leptoph/jlla. 



++++++++++ Heads small and narrow, verj- few-flowered : flowers glabrous: stems woody 

 at base: habit of the following section. 

 A. Bigelovii, Gray. Silvery-canescent throughout, a foot high : leaves from oblong- to 

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

 numerous and crowded in the obloug or virgate thyrsiform panicle, tomeutose-canescent, 

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

 R. Rep. iv. 110. — Rocky banks and caTions, Colorado, on the Upi)er Canadian and Arkansas, 

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



§ 3. Seripiiidium, Bess. Heads homogamous, 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 ■ Parishii, Gray. Frutescent, cinereous-puberulent : leaves linear and entire, below pass- 

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

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

 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 puberulent ; but leaves white 

 beneath with close cottony tomentum, 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 tjian 2 lines in diameter: involucre greenish, about 20-flowered ; many of the 

 flowers subtended by scarious-hyaliue 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 spicifonn inflorescence, not 

 nodding even when j-oung: corollas sometimes turning reddish. 



•i— Foliose-spicate : 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 veiy 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 obloug to campanulate, 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, Nuttull (without 

 flowers), Cusic.k. 



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

 tending leaves ; tliese not rigid. 



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

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

 an ineh long, mostly shorter. 



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

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

 obovate to spatulate-linear, sometimes again 2-lobed ; those sul)tending tlie heads usually en- 

 tire and narrow : panicle strict and comparatively simple and naked, often spicifonn 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 Ntitfall, &c. ); one 

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

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



A. tridentata, Nutt. 1. c. Larger, l to 6 (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- 



