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



mediates connect this variety directly with the next. One of 

 these is 7. oxyphylla Greene (near San Diego, Palmer, no. 134), 

 which has thin, narrow, entire, very acute leaves and large, tur- 

 binate heads : both involucre and leaves are slightly pubescent in 

 Palmer's no. 134 as represented by a specimen in the Brandegee 

 Herbarium, and the corolla-limb is not "remarkably short" as 

 described by Greene. Mission Valley, near San Diego, 1883, 

 Cleveland, is the same, but with many of the leaves remotely 

 toothed. 



Var. acradenia (Greene) Hall, comb. nov. Bigelovia acradenia 

 Greene, Bull. Torr. Club x. 126 (1883). Isocoma acradenia 

 Greene, Eryth. ii. Ill (1894). 7. bracteosa, leucanthemifolia, & 

 eremophila Greene, Leaflets i. 170-171 (1906). Herbage very 

 light-colored, often glabrous ; the bark of the stems becoming 

 white and shining : leaves entire or toothed, the fascicled ones not 

 numerous : inflorescence commonly a loose panicle of close few- 

 headed cymes. A form of the arid Lower Sonoran Zone : Ante- 

 lope Valley, Mohave Desert, Davy, no. 2949 ; common on the 

 Colorado Desert ; Upper San Joaquin Valley. The common form 

 of this variety has entire leaves and glabrous herbage. When 

 the herbage is hispidulous and the inflorescence marked with 

 small bract-like leaves, it is 7. bracteosa Greene (Tulare Co., ace. 

 to Greene; Bakersfield, Davy, no. 1919, probably). When the 

 leaves are toothed and the herbage pubescent, it is 7. leucanthemi- 

 folia Greene (desert side San Jacinto Mts., Vandeventer, no. 11). 

 When this form loses its pubescence, it is 7. eremophila Greene 

 (Colorado Desert, Wales, no. 17). 



Endless forms, other than those mentioned, might be described 

 from the abundant material at hand, but they could be charac- 

 terized only by various combinations of characters well known to 

 be inconstant. They are therefore best referred to one or the 

 other of the above two varieties. 



17. HAZARDIA Greene. 



Shrubs of suffrutescent plants with brittle ascending stems. 

 Herbage tomentose, or glandular, or quite glabrous, never resin- 

 ous-punctate. Leaves alternate, coriaceous, entire to spinulose- 

 serrate. Heads chiefly paniculate, 20 to 40-flowered, turbinate 



