1907] Hall. Compositae of Southern California. 255 



2. H. glabra L., Sp. PL 810 (1753). 



Scapes several, erect from a straight annual taproot, 1 to 5 

 dm. high : herbage glabrous : leaves broadest above, denticulate to 

 broadly toothed or saliently lobed: ligules scarcely longer than 

 the involucre: outermost achenes truncate at summit, the others 

 all beaked. 



A naturalized weed : Pasadena, Grant; abundant on low hills 

 back of Santa Barbara, 1907, Hall, no. 7738; sandhills near 

 Santa Maria, 1906, Miss Eastwood, no. 366; Paso Robles, Cobb; 

 Santa Cruz Island, ace. to Greene 66 ; and northward. 



109. STEPHANOMERIA Nutt. 



Tall and rather slender herbs, the stems either strict or panic- 

 rJately branched. Upper leaves reduced to herbaceous bracts. 

 Heads small, 3 to 20-flowered. Flowers pink or flesh-color, open 

 in the early morning, the ligules all equal. Involucre cylindric 

 or rarely campanulate. Eeceptacle flat. Achenes oblong, short- 

 linear or somewhat turbinate, strongly angled, glabrous, often 

 rugose, truncate at each end, the broad base hollowed at the 

 insertion. Pappus-bristles white or sordid, more or less plumose. 



Eeceptacle deeply pitted, hirsute: involucre imbricated: root perennial: 



young herbage woolly 1. S. cichoriacea. 



Eeceptacle naked: involucre not imbricated but calyculate at base with 



minute bracts, rarely one or two intermediate bracts. 

 Involucre 10 to 14-flowered, 12 mm. or more high: perennial with 



sharply lobed upper leaves 2. S. Parryi. 



Involucre 3 to 6 (or 9) -flowered, less than 12 mm. high. 

 Perennials. 



Stems herbaceous, erect and very slender 3. S. tenuifolia. 



Stems woody below, spreading and nearly leafless above. 



Branches rigid, mostly divaricate 4. S. runcinata. 



Branches very slender, flexuous, ascending 5. S. myrioclada. 



Annuals and biennials. 



Pappus plumose almost throughout, the base scarcely thickened. 



Herbage glabrous 6. S. virgata. 



Herbage white-tomentose when young 7. S. tomentosa. 



Pappus plumose only above; the naked base thickened or pal- 

 eaceous, often toothed or giving off short secondary 

 bristles 8. S. exigua. 



66 Bull. Calif. Acad. ii. 405 (1887). 



