222 University of California Publications in Botany. [VOL. 3 



entire leaves 1 cm. or so long, but the tomentum early deciduous 

 and all the later leaves reduced to ovate-acute scales (1 mm. or 

 less long) of the green branches : heads solitary terminating the 

 short lateral branchlets and thus appearing as if racemose or 

 spicate, the uppermost nearly or quite sessile and thus glomer- 

 ate : involucre campanulate, 5 to 8 mm. high : achenes glabrous. 

 Common in sand-washes and in dry gravelly soil of the Sono- 

 ran zones, from San Luis Obispo Co. to Lower California and east 

 to Arizona. Also near Exeter, Tulare Co., in the San Joaquin 

 Valley, Jul. 23, 1905, Mrs. Brandegee. 



91. ARNICA L. 



Erect perennial herbs of temperate and arctic regions. 

 Leaves all opposite or the upper alternate. Heads large, yellow- 

 flowered, mostly several and long-peduncled at the summit of the 

 single stem. Involucre broadly campanulate, not calyculate at 

 base; bracts equal. Eeceptacle flat, naked to fimbrillate or vil- 

 lous. Disk-flowers many, yellow; ray-flowers pistillate when 

 present, yellow. Style-branches with flattish tips acute or ob- 

 tuse. Achenes slender, somewhat 5 to 10-costate or angled. 

 Pappus a single row of rather rigid and strongly roughened 

 denticulate white bristles. 



Lower leaves cordate or ovate, obtuse 1. A. cordifolia. 



Lower leaves elliptic-lanceolate, acute 2. A. Bernardino,. 



1. A. cordifolia Hook., Fl. Bor. Am. i. 331 (1834). 



Stems 3 to 6 dm. high, from creeping rootstocks: herbage 

 pubescent, the stems and peduncles commonly hirsute or villous: 

 lower leaves long-petioled, deeply cordate to ovate, obtuse, den- 

 tate; upper leaves small, sessile: heads either solitary and ter- 

 minating the simple stem or several and long-peduncled in a 

 loose cyme : involucre about 15 mm. high : rays about 2.5 to 3 cm. 

 long: achenes somewhat hirsute. 



Lower Transition Zone on Cuyamaca Ml, San Diego Co., 

 Aug., 1898, Dunn; Sierra Nevadas to British Columbia and Colo- 

 rado. 



2. A. Bernardina Greene, Pitt. iv. 170 (1900). 



Stems 2.5 to 5 dm. high, from a cluster of thick roots : herbage 

 cinereous with a fine tomentose pubescence, this overspread (often 



