1907 1 Hall. Compositae of Southern California. 265 



Stem freely branching, the branches ascending and sparsely 

 leafy except near the base: herbage glabrous or early glabrate: 

 leaves oblong, or the upper narrowly lanceolate, pinnatifid with 

 short callous-toothed lobes: peduncles 3 cm. or less long: invo- 

 lucre about 8 mm. high; its bracts linear-acuminate: ligules 

 bright yellow, a full cm. long: achenes 15-striate, 5 of the ribs 

 stronger than the others, rendering the achene somewhat 5-angled, 

 crowned with a 15-denticulate white border : permanent pappus- 

 bristles none. 



Lower Sonoran Zone, not common: Antelope Valley, Mohave 

 Desert, Davidson; Rabbit Springs, Parish, no. 1264; Olancha, 

 Lone Pine Creek, etc., Inyo Co. ; eastward to Nebraska. 



M. TORREYI Gray, and M. FENDLERI Gray, are to be expected 

 along our eastern borders. In the former the achenes are 5- 

 angled by as many salient ribs which are often almost wing-like : 

 permanent bristles 2 to 8 and between them some minute teeth. 

 In M. Fendleri the achenes are cylindric, bordered by a shallow 

 crown with entire margin : persistent bristles none or only one. 



5. M. Cleveland! Gray, Bot. Calif, i. 443 (1876). 



Plant 2 to 4 dm. high, the stem diffusely branching through- 

 out and bearing numerous loosely panicled heads of yellow flow- 

 ers: herbage glabrous: radical leaves numerous, pinnatifid, the 

 cauline scattered and more nearly entire: involucre 6 to 8 mm. 

 Idgh, few-flowered ; its narrow bracts with purplish tips : ligules 

 yellow : achenes oblong-linear, minutely striate-costate : outer pap- 

 pus of one persistent bristle and a circle of white setulose teeth. 



At middle and lower altitudes in the mountains: Rancho 

 Vie jo, Lower California, Brandegee; Ramona, San Diego Co.. 

 Brandegee; Santa Cruz Island, Brandegee; south side of San 

 Jacinto Mt, Hall, nos. 1817, 2087; Cajon Pass, Parish, no. 4868; 

 Jurupa Hills, near Riverside, Mrs. Wilder, no. 582; Santa Inez 

 Mts., Dunn; Zaca Lake Forest Reserve, Santa Barbara Co., Miss 

 Eastwood, no. 568; north to the base of Mt. Shasta (Sissons). 

 Brandegee. 



6. M. obtusa Benth., PL Hartweg. 321 (1849). M. parviflora 

 Benth., 1. c. 



Habit, foliage, and involucre of M. Clevelandi, but often with 



