Artemisia. COMPOSITE. 367 



peduncled, hemispherical, the flat or at length low-convex disk half-inch broad : disk-corollas 

 with flattened tube and 3 small lobes, not surpassing the disk-flowers, regularly 3-5-toothed, 

 not at all liguliform. — Linnsea, vi. 521. T. Huronense, Nutt. Trans. Am. Phil. Soc. 1. c, in 

 part ; Torr. & Gray, Fl., in part ; Gray, Bot. Calif, i. 402. T. elegans, Decaisne in Fl. Serres, 

 ser. 2, xii. t. 1191. Omalanthus campkoratus, Less. Syn. 260; Hook. Fl. i. 321, as to pi. 

 Calif, only. Omalotes camphorata, DC. Prodr. vi. 83. — Sea-beaches, San Francisco, Cali- 

 fornia ; first coll. by Menzies, next by Chamisso. 



§ 2. Low perennials : slender stems more naked above, bearing rather small 

 globular heads : leaves less dissected or entire : corolla of disk-flowers not oblique 

 nor dilated at summit, regularly 2-4-toothed : akenes usually utricular • pappus 

 obsolete or none : receptacle convex or conical. — § Sphceromeria, Torr. & Gray, 

 1. c. 415. Sphceromeria, Nutt. Trans. Am. Phil. Soc. n. ser. vii. 402. 



# Herbaceous to the thickened root : leaves dissected : receptacle densely fimbrillate-hirsute. 

 T. potentUloides, Gkat. Silvery-sericeous : stems decumbent or ascending, a span to a 

 foot long, the naked summit bearing a few slender-peduncled somewhat corymbiform-panic- 

 ulate heads (of 3 or 4 lines in diameter) : radical leaves 2-3-pinnately and cauline 1-2-pin- 

 nately parted into rather few mostly linear lobes : bracts of the involucre roundish-ovate or 

 obovate. — Proc. Am. Acad. ix. 204; Bot. Calif. 1. c. Artemisia potentUloides, Gray, Proc. 

 Am. Acad. vi. 551. — Eastern ranges of the Sierra Nevada, California and adjacent Nevada, 

 Lemmon, Anderson. 



# # Suffrutescent at base, erect : leaves simply or pedately cleft or entire : receptacle not hirsute, 

 sometimes conical : heads only 2 lines broad. — Sphceromeria, Nutt. 



T. diversifolium, Eaton. Glabrous, very smooth, 8 to 15 inches high, leafy : leaves some 

 narrowly linear and entire, 1 -nerved, some pinnately or pedately parted : heads several or 

 rather numerous in a corymbiform cyme, slender-peduncled: female flowers 8 or 10, with 

 3-4-toothed corolla. — Bot. King Exp. 1 80, t. 19. — Utah, in the American Fork Canon ; 

 first coll. by Watson. 



T. oanum, Eaton. Silvery with minute close tomentum, a span or two high : lower leaves 

 cuneate and 3-lobed or 3-cleft ; upper linear-lanceolate, mostly entire : heads few or several, 

 very short-peduncled or in clusters of 2 or 3 terminating the short branches of the cyme : 

 female flowers 4 to 8, with a truncate obscurely toothed corolla. — Bot. King Exp. 179, 

 t. 19, f. 8-14; Rothrock in Wheeler Rep. vi. 366. — Nevada, in a canon of E. Humboldt 

 Mountains, Watson. Olanche Mountain, S. E. California, Rothrock. 



T. Nuttallii, Torr. & Gray. Silvery-cauescent, loosely cespitose, a span high : leaves 

 short, mostly broadly cuneate with tapering base, obtusely 3-5-lobed at the broad summit ; 

 those of the flowering stems usually oblong or linear and entire : heads few, somewhat panic- 

 ulate or loosely clustered, some of them slender-pedunculate : involucre very scarious. — 

 Fl. ii. 415. Sphceromeria argentea, Nutt. Trans. Am. Phil. Soc. vii. 402. — Rocky Mountains 

 of N. Wyoming, Nuttall, Parry. 



T. capitatum, Torr. & Gray, 1. c. Silvery-canescent, densely cespitose, a span high : 

 leaves simply or pedately 3-5-parted into linear lobes, or some of them only 3-cleft at sum- 

 mit: flowering stems scapiform or 2-4-leaved: heads 10 or more, sessile in a globose glom- 

 erule. — Sphceromeria capitata, Nutt. Trans. Am. Phil. Soc. 1. c — Rocky Mountains of N. 

 Wyoming, Nuttall, Parry. 



178. ARTEMISIA, Tourn., L. Wormwood, Sage-brush, Mug wort. 

 (Ancient name of Mugwort, in memory of Artemisia, wife of Mausolus.) — 

 Herbs and low shrubs (chiefly of the northern hemisphere, and most abundant in 

 arid regions), bitter-aromatic ; with alternate leaves, and small paniculately dis- 

 posed heads, commonly nodding, at least when young ; the flowers yellow or 

 whitish, or turning brownish, usually sprinkled with resinous globules. Anthers 

 commonly tipped with subulate-acuminate appendages, in the manner of Am- 

 brosia, but not inflexed.-- Besser in DC. Prodr. vi. 93. Artemisia, Abrotanum, 

 & Absinthium, Tourn. 



