422 COMPOSITiE. Artemisia. 



6. elatior: leaves as in y.; the lobes entire ; heads as in fS., sraoothish, in 

 numerous more or less elongated racemes, forming an ample virgate- 

 pyramidal panicle. — A. vulgaris, Bess.! in Hook. I. c, in part. A. Indica (3. 

 Canadensis, Bess. I. c. 7 A. vulgaris /3/3. Americana (as to the Northern 

 plant), Bess, in Linntea, 15. p. 105. 



Arctic shores of Asia and America ! toUnalaschka ! S. Subarctic America, 

 Richardson ! — A polymorphous plant, with larger (frequently 3 lines in di- 

 ameter), more globose and racemose heads, and more scarious involucres than 

 any form of A. vulgaris. 



21. A. Hookeriana (Qess.) '. suffruticose, erect: leaves -with their lower 

 surface as well as the stem canescent ; the cauline pinnatifid, their lobes, like 

 the floral leaves, lanceolate, acute ; heads globose, nodding, in a terminal 

 thyrsoid and scarcely leafy panicle ; scales of the involucre woolly, with sca- 

 rious margins ; the inner rounded. Bess, in Hook. I. c, Sf DC. I. c. 



Rocky Mountains, Drummond. — Heads l\-2 lines long. Corolla purplish. 

 Resembles a form of luxuriant A. vulgaris. DC. 



22. A. Michauiiana (Bess.): herbaceous, erect; stem simple ;_ leaves 

 whitish-tomentose beneath, pinnatifid ; the lobes of the lower ones incisely 

 toothed, of the upper and also the floral leaves linear-lanceolate; heads race- 

 mose, globose, nodding; scales of the involucre glabrous, with the sides sca- 

 rious and shining; corolla glabrous. Bess, in Hook. I. c, S^'DC I. c. 



Rocky Mountains, and on the Oregon, Douglas. — Plant wath the aspect of 

 A. vulgaris var. Mongolica. Raceme sometimes simple, sometimes branch- 

 ed at the base. DC. 



23. A. incompta (Nutt.) : herbaceous, glabrous, except the lower surface 

 of the pinnatifid leaves, which is cinereous ; their lobes (3-5) linear-oblong, 

 entire (the lateral sometimes toothed ?) ; heads subglobose, racemose-panicu- 

 late, erect, on short pedicels : scales of the involucre glabrous and shining, 

 scarious ; the exterior ovate ; corolla glabrous. — Nutt. ! in trans. Amer. pliii. 

 soc. I. c. p. 400. 



Central chain of the Rocky Mountains, in Thornberg'sPass (about lat. 41°), 

 NuitalL ! — Plant 1-2 feet high. Remarkable for its smoothness ; at first sight 

 somewhat resembles some varieties of A. vulgaris, but is very distinct. Nutt. 

 — Perhaps the same as the preceding, which is unknown to us. 



24. A. pachystachya (DC.) : suffruticose (herbaceous, Nutt.), woolly-se- 

 riceous throughout ; stems simple ; cauline leaves crowded and also fascicled in 

 the axils, bipinnately divided, or simply pinnate and as if stipulate at the 

 base; the lower pinnae scattered, those at the apex crowded; lobes short, 

 narrowly linear-lanceolate ; heads subglobose, glomerate-spicate ; the spikes 

 crowded in a long spicate panicle, bracteate at the base; scales of the in- 

 volucre ovate, villous on the back; the inner scarious; corolla glabrous. — 

 DC! prodr. 6. p. 114; Nutt. in trans. Amer. phil. soc. I. c. (under the 

 name of A. pycnostachya.) 



California, Douglas ! Coast of Monterey, Nuttall. — The crowded panicle 

 1-2 feet long, composed of short sessile spikes. Heads 15-20-flowered. 



25. A. Richardsoniana (Bess.); csespitose; leaves somewhat silky [canes- 

 cent] ; the radical on long petioles, and with the lower cauline pinnately di- 

 vided; the upper 3-cleft ; lobes of the radical leaves 3-5-cleft, of the upper 

 undivided, linear, obtuse ; heads racemose-spicate, glomerate, globose; pe- 

 duncles woolly at the summit; scales of the involucre fuscous, scarious, 

 woolly on the back ; corolla a little hairy at the summit (varies with the pe- 

 duncles strict, and with the heads somewhat nodding). Bess. ! in DC. prodr. 

 6. p. 117. A. arctica, Bess. ! in Hook.fi. Bor.-Am. 1. p. 323, not of Less. 

 A. caespitosa, Bess, in Hook. I. c. ? , , , nr t> ■ 



From Bear Lake to the shores of the Arctic Sea, Richardson ! Mt. Ranier, 



