Artemisia. COMPOSITE. 403 



5-toothed. Anthers usually with narrow tips. Akenes obovoid or oblong, mostly 

 rounded at the apex and with a rather small terminal areola, almost always glabrous. 

 Pappus none, or in one species a vestige. Herbs or undershrubs, bitter and 

 odorous ; with alternate leaves most commonly dissected, and the numerous small 

 heads of yellow or yellowish flowers usually nodding, and racemose or panicled, 

 sometimes paniculate-spicate. 



An immense genus mainly of the northern hemisphere, its headquarters in Northern Asia ; not 

 many species in California, and fewer still in the Atlantic States ; but abounding through the 

 interior arid region, where the Suge-bushcs form a characteristic feature. Our species are all per- 

 ennials, A. biennis, Willd., not having been found so far west. To facilitate the determination 

 of the species an artificial key is appended. 

 Herbaceous, or hardly woody at the base ; 



Green and nearly glabrous : leaves linear, entire, 6. A. DRACUNCULOIDES. 



Green, becoming glabrous : leaves twice pinnately parted, 2. A. NORVEGICA. 



White-cottony underneath the leaves ; upper face green. 



Lobes of the leaves lanceolate, acute, 3. A. VULGARIS. 



Lobes of the leaves narrowly linear, 4. A. DISCOLOR. 



White-cottony throughout, 5. A. LUDOVICIANA. 



Silky villous all over, 7. A. PYCNOCEPHALA. 



Shrubby and spiny : heads few and scattered, 8. A. SPINESCEXS. 



Shrubby, unarmed. (See also No. 7.) 



Grayish-puberulent : pinnate leaves with long filiform divisions, 1. A. CALIFORNICA. 



White-pubescent : leaves palmately cleft or toothed, sometimes entire. 



One to 6 feet high : leaves about 3-toothed, 9. A. TRIDENTATA. 



A span or two high : leaves deeply cleft or some entire : 



Their 3 lobes linear, 10. A. TRIFIDA. 



Their 3 to 5 lobes obovate or spatulate, 11. A. ARBUSCULA. 



1. JFtotocrt hetfrogamons (some of the marginal ones pistillate only), but all fertile : 

 receptacle not villous. ABROTANUM, Besser. 



* Shrubby : lobes of the cinereous-puberulent leaves filiform-linear. 



1. A. Californica, Less. About 4 feet high, with a decidedly woody base, 

 very leafy : leaves all pinnately 3 7-parted into almost filiform divisions, or some 

 of the uppermost entire : heads small and numerous in narrow racemose panicles : 

 scales of the involucre broad, nearly glabrous : akenes somewhat turbinate and 

 3 - 5-ribbed, utricular, with a very broad and somewhat toothed summit. A. 

 Fischeriana, Besser. A. foliosa & A. abrotanoides, Nutt. 



Dry banks, from below Santa Barbara to San Francisco. Heads roundish, about 2 lines in 

 diameter. Receptacle hemispherical, naked, not hairy, as said by Nuttall. 



* * Herbaceous : leaves or their lobes linear-lanceolate or broader. 



-t- Not ivhite-cottony : corolla sparsely hairy. 



2. A. Norvegica, Fries. A span to 2 feet high, stout, loosely villous-pubescent 

 when young, or glabrous : leaves mostly bipinnately parted or cleft into linear- 

 lanceolate or broader acute lobes, or the uppermost reduced to trifid or simple 

 bracts : heads large, in a simple naked panicle or loose raceme : scales of the invo- 

 lucre oblong, brownish : akenes oblong, about 5-angled. Novit. Suec. ed. 1 (1817), 

 56. A. rupestris, Fl. Dan. t. 801. A. arctica, Less. (1831). A. Chamissoniana, 

 Besser in Hook. Fl. 



North side of Wood's Peak in the Sierra Nevada, at 9,000 feet, Brewer. Also in the Eocky and 

 other high mountains to Alaska, Arctic America, E. Siberia, and the Norwegian Alps. Heads 

 globular, about 4 lines in diameter. 



4- -t- Leaves white-cottony-tomentose underneath or on both sides : corolla glabrous. 



3. A. vulgaris, Linn. A foot or two high ; branching : leaves green and gla- 

 brous or soon becoming so above, cottony-tomentose beneath, laciniately once or 

 twice pinnatifid, or some of the upper sparingly lobed or toothed ; the lobes lanceo-- 



