1020 FLORA. 



long, deeply pinnatifid, into linear, oblong or somewhat spatulate, pinnatifid, 

 toothed or entire lobes, densely white-tomentose beneath, dark green and glabrous 

 above, the lower petioled, the upper sessile, the uppermost sometimes linear and 

 entire; heads numerous, erect, about 4 mm. broad, in panicled simple or compound 

 spikes; involucre oblong-campanulate, its bracts oblong, obtusish, scarious-margined; 

 tomentose or g'abrous. In waste places, N. S. to Ont., Mich., N. C. and Penn. 

 Nat. from Eur ,pe. Native also of Asia. July-Oct. 



14. Arte nisia Pontica L. Roman or Hungarian Wormwood. (I. F. f. 

 401 1.) Per nnial; stem branched, glabrous or canescent, 3-10 dm. high. Leaves 

 3 6 cm. lor g, 2-3 pinnately dissected into short narrow lobes less than 2 mm. wide, 

 canescent on both sides, or tomentose beneath, the lower petioled and the petioles 

 somewhat clasping or auricled at the base, the upper mostly linear and entire; 

 heads numerous, 2-4 mm. broad, drooping, slender-peduncled; involucre hemi- 

 spheric, canescent, its bracts oblong or obovate, obtuse, the outer short, lanceolate. 

 Railway embankment near Tumble Station, Hunterdon Co., N. J,; mountain-side 

 near Lily Lake, Luzerne Co., Pa. Fugitive or adventive from central Europe. 

 July-Aug. 



15. Artemisia Kansarta Britton. Kansas Mugwort. (I. F. f. 4012.) 

 Densely white-woolly all over; stem erect, much branched, the branches strict, 

 bearing very numerous small heads forming a narrow dense panicle. Leaves nu- 

 merous, crowded, the lower pinnately divided into 3-7 narrowly linear revolute- 

 margined segments 1 mm. wide or less, greenish above; upper leaves mostly 

 narrowly linear and entire; heads oblong-oval, sessile, or very short-peduncled, 

 erect, or somewhat spreading, 3 mm. long: involucre very woolly, its bracts ovate- 

 lanceolate to oblong-lanceolate, acute. Plains, western Kans. 



16. Artemisia serrata Nutt. Saw-leaf Mugwort. (I. F. f. 4013.) 

 Perennial; stem stout, tomentose or becoming glabrous, much branched, 1.5-3 m * 

 high. Leaves lanceolate, 5-15 cm. long. 6-25 mm. wide, densely white-tomentose 

 beneath, acuminate at the apex, narrowed to a sessile base, or the lowest petioled; 

 heads very numerous, greenish, erect, about 3 mm. broad, sessile or short-peduncled 

 in panicled spikes or racemes; involucre canescent, its bracts oblong, obtuse, or 

 the outer ones lanceolate. Prairies, 111. to Minn, and S. Dak. Introduced on the 

 Mohawk River, near Schenectady, N. Y. Aug. -Oct. 



17. Artemisia longifolia Nutt. Long- leaved Mugwort. (I. F. f. 4014.) 

 Perennial; stem densely white-tomentose, branched, 6-15 dm. high. Leaves linear 

 or linear-lanceolate, 5-12 cm. long, 2-10 mm. wide, acuminate, tapering to a 

 sessile base, or the lower petioled, densely white-tomentose on both sides, or 

 becoming green and glabrate above; heads numerous, erect, spicate-paniculate, 

 about 4 mm. broad; involucre tomentose, its bracts oblong, obtuse. In dry rocky 

 soil, western Neb. to Minn., Mont, and the N. W. Terr. Aug. -Sept. 



18. Artemisia gnaphalddes Nutt. Prairie, Western or Cud-weed 

 Mugwort. (I. F. f. 4015.) Perennial, similar to the preceding species; stem 

 white-tomentose, usually much branched, 3-12 dm. high. Leaves lanceolate or 

 oblong, 3-7 cm. long, 4-12 mm. wide, entire, or the lower somewhat toothed, 

 white-tomentose on both sides, acute or acuminate, sessile or the lower narrowed 

 into short petioles; heads numerous, erect, spicate-paniculate, above 3 mm. broad, 

 involucre oblong, tomentose. On prairies and dry banks, western Ont. and 111. to 

 Br. Col., south to Mo., Tex., Ariz., Mex. and Cal. Aug. -Oct. 



19. Artemisia Ludoviciana Nutt. LOBED Cud-weed. Perennial, ascending 

 or erect, lower than the preceding, 3-5 dm. high, branched; stem somewhat 

 tomentose. Leaves oblanceolate or somewhat cuneate in outline, 2-5 cm. long, 

 densely white-tomentose beneath, floccose but greener above, deeply 3-7-lobed 

 with lanceolate lobes, or the upper entire; heads very small and numerous, somewhat 

 nodding; involucre oblong-campanulate, tomentose, but less so than in the pre- 

 ceding. Prairies and mountain-sides, Mo. to Col. Aug. -Oct. 



20. Artemisia Bigeldvii A. Gray. Bigelow's Sage-bush. (I. F. f. 4016.) 

 Perennial, shrubby, silvery-canescent throughout, 2-4 dm. high, much branched, 

 the branches erect. Leaves narrowly cuneate. or oblong, obtuse, truncate, or 3-5- 

 toothed at the apex, 10-18 mm. long, about 2 mm. wide; heads very numerous, 

 about 2 mm. broad, densely glomerate-spicate in a narrow virgate panicle, 2-5- 

 flowered, I or 2 of the marginal ones pistillate, the others perfect and fertile; invo- 



