366 COMPOSITE ARTEMISIA 



less toothed : hea<ls about 1% ines broad, not drooping, sessile and very 

 numerous. River banks and yards, Brit. Columbia to California Texas and 

 Hudson Bay. 



A. Richardsoniana Bess. Supple. 64, & DC. Prodr. vi, 117. Sterns 

 rather slender, 8-12 inches high, from a cespitose perennial caudex: leaves 

 silvery-caneseent with fine very close -pressed pubescence; radical twice 

 ternately or quinately divided or parted into oblong-linear or narrower 

 lobes of 2-3 lines in length; cauline few, mostly trifid : heads 2 lines high, 

 several or rather numerous in a strict simple racemiform inflorescence, 

 fuscous: corollas pilose or sometimes glabrous. On Mount Rainier Wash- 

 ington to the Arctic coast and the northern Rocky Mountains. 



A. Ludoviciana Nutt. Gen. ii, 143 Canescently tomentose throughout, 

 or the upper face of the leaves sometimes early glabrate and green : stems 

 1-4 feet high, simple or with virgate branches : leaves lanceolate to oblong, 

 mucronate, remotely serrate or 2-3- cleft, or irregularly 3-5-parted into lan- 

 ceolate or linear entire lobes; the upper entire: heads gl nifcrately panicu- 

 late, not over 2 lines hiuh ; involucre campanulate, or in fruit ovoid, 12-20- 

 flowered, lanate-tomentose. Common on plains and banks, Brit. Colum- 

 bia to California. 



A. heterophylla Nutt. Trans. Am. Phil. Soc vii, 400. A. vulgaris var. 

 Californica Bess. Stems erect, 3-5 feet high, leafy to the top, simple : 

 leaves lanceolate or broader, 2-4 inches long, white beneath with cottony 

 tomentum, entire, or often laciniately toothed or cleft : heads numerous, 

 in a short and dense naked panicle, 2 lines high, glabrate. On moist banks 

 along the coast, Alaska to California. 



A. discolor Dougl. in Herb. Hook. Bess. DC. Prodr. vi, 109. Stems 

 mostly slender, 9-12 inches high, from a slender lignescent caudex: leaves 

 1-2-pinnately parted into narrow, linear or lanceolate entire or sparingly 

 laciniate divisions and lobes, white beneath with close cottony tomentum, 

 glabrate above : heads glomerate in an interrupted spiciform or virgate pan- 

 icle, 1-2 lines high; involucre hemispherical-campanulate, greenish and 

 scarious, glabrous or soon becoming so, 20-30-flowered. Mountains of 

 Brit. Columbia to Washington and Mon'ana. 



A. iucompta Nutt. 1. c. Stems rather slender, 1-2 feet high : leaves 

 once or twice pinnately parted into broadlv to narrowly linear lobes, green 

 and glabrate above, pale and slightly t mentose beneath : heads about 2 

 lines high, in narrow spicate clusters on the upper parts of the stem and 

 branches; bracts of the campanulate involucre ovate, scarious-margined, 

 nearly glabrous. Mountains of Washington to California and the Rocky 

 Mountains. 



A. Lindleyana Bess. Abrot. 35. "A foot or tw~, rarely only a span 

 high, slender, with thin flocculent tomentum soon deciduous, or persisting 

 on the lower face of the mostly entire leaves (these inch or less long, a line 

 or much less wide, the lower occasionally with 2 or 3 small lobes) : heads 

 barely 2 lines high, loosely spicate on the simple stem or paniculate bran- 

 ches of the inflorescence : involucre sparingly pubescent or glabrate, pale 

 fuscous. Sandy banks ot the Columbia River and its tributaries." 



A. Prescottiana Bess. 1. c. 72. " Much branched from the base, a foot 

 or two high, slender, glabrous or early glabrate : lower leaves cuneate-linear 

 and incised or cleft at apex, slightly tomentose beneath ; most of the cau- 

 line pinnately parted into 5 to 7 delicate filiform divisions (of an inch or 

 less long) : involucre glabrous, hemispherical, about 15-flowered. Quick- 

 sand River near the Grand Rapids of the Columbia Douglas. " 



3 SERTPHIDIUM Bess. Bull. Soc. Nat. Mosc. vii, 5. Low 

 shrubs or fruticulose plants. Canescent or silvery with very fine 



