262 COMPOSITE FAMILY 



Leaves white-woolly beneath. 



Upper surface of leaves also woolly 3. A. ludoviciana. 



Upper surface green 4. A. heterophylla. 



Plant shrubby, the stems woody. 



Leaves mostly 3-lobed at summit 5. A. tridentata. 



Leaves mostly entire 6. A . rothrockii. 



1. A. dracunculoides Pursh. A green and glabrous per- 

 ennial herb (not woody), 2 to 5 ft. high, with many erect 

 leafy stems. Leaves linear, 1 to 4 in. long, mostly entire. 

 Heads many, in panicles. — Widely distributed in North 

 America; common in all of our valleys. 



2. A. norvegica Fries. A soft-hairy herbaceous perennial 

 with a thick root and numerous erect leafy stalks ^ to 2 ft. 

 high. Leaves 2 to 6 in. long, including the petiole, parted into 

 many linear or lanceolate lobes. Heads (over % in. across) 

 many-flowered, long-peduncled, numerous, in a loose terminal 

 cluster 6 to 12 in. long, the bracts with broad brown margins. 

 — Grows only at high altitudes, as near the head of Indian 

 Canon, but ranges from Tulare Co. to Pyramid Peak and the 

 far north, extending even to northern Europe. 



3. A. ludoviciana Nutt. A white-pubescent perennial, 

 slightly woody at base, the leafy stems 1 to 4 ft. high, from 

 rootstocks. Leaves lanceolate or oblanceolate, coarsely 

 toothed or parted into acute lobes (the upper ones narrow 

 and entire), V/z to 4 in. long, permanently white-woolly on 

 both sides. Heads in panicles. — Widely distributed at moder- 

 ate altitudes. 



4. A. heterophylla Nutt. Like no. 2 but leaves mostly 

 broader, less toothed, and green above. — Found in similar 

 localities. 



5. A. tridentata Nutt. Sagebrush. An erect much- 

 branched shrub with distinct trunk and shreddy bark, the 

 leaves and twigs gray-woolly throughout. Leaves wedge- 

 shaped, the broad summit with 3 or 4 teeth (the uppermost 

 ones linear and entire), y 2 to V/2 in. long. Heads in loose 

 panicles, 5 to 8-flowered. — The dominant shrub of the Great 

 Basin, occurring with us in dry, rocky places from the lower 

 slopes up to at least 9500 ft. alt. 



6. A. rothrockii Gray. A low shrub, resembling the com- 

 mon Sagebrush but the leaves mostly entire, the others 

 3-lobed at summit; heads larger, more globose, 9 to 14- 

 flowered, the yellowish-green bracts ovate or oval. — High 

 Sierra Nevada, chiefly on the desert side; occurs at Mono 

 Pass and Mt. Dana; also reported from Crescent Lake. 



