SUNFLOWER FAMILY. 



533 



leaves linear and entire, tapering into a .subulate or pungent tip, those 

 about the head spreading and star-like, mostly all bearing stipitate 

 glands; bracts of the involucre subulate, those of the receptacle 

 pointless, soft, hairy; ray-achenes flattened laterally, nearly semi- 

 circular in outline, smooth; pappus of disk-achenes of 9 to 11 linear 

 palea; as long as the corolla and hairy or fimbriate at the tip. — (Hemi- 

 zonia Fitchii Gray.) 



High sandy land in the valleys and foothills: Sierra Foothills and 

 the Lower San Joaquin northward through the Sacramento Valley 

 and westward to Napa and Sonoma Cos. Aug. -Sept. 



50. CALYCADENIA DC. Rosin Weed. 

 Erect annuals, hirsute or hispid or almost glabrous. Stems simple, 

 or with virgate branches, or repeatedly branched. Leaves all entire, 

 narrowly linear, becoming filiform by revolution of the margins, at 

 least those near the heads and those of the fascicles in the axils 

 bearing at apex tack-shaped or saucer-shaped glands. Heads oblong 

 or narrow. Flowers white or yellow. Ray-flowers few (1 to 5 or 8), 

 the ligules broad and palmately 3-lobed or -parted; ray-achenes 

 obovoid-triangular, the areola at summit quite or nearly in the center; 

 pappus none. Disk-flowers surrounded by a circle of bracts connate 

 into a cup, or at length separating; disk-achenes with conspicuous 

 paleaceous pappus. (Greek kalux, covering, and adenos, a gland, 

 on account of the glands on the involucre.) 



Rays 5 to 8; flowers yellow; plants for the most part very glabrous 



1. C. truncata. 



Rays 1 to 5. 

 Flowers white or reddish-tinged. 

 Stems repeatedly branched ; branches filiform . . . 2. C. pauciflora. 

 Stems simple or with virgate branches. 

 Pappus-palese unequal; floral leaves not truncate. 3. C. multiglandulosa. 

 Pappus-palese subequal; floral leaves truncate . .4.0. spicata. 

 Flowers yellow; stems simple 5. C. hispida. 



1. C. truncata DC. Rosin Weed. Stems 1 to 3 ft. high, 

 reddish brown, simple below, branching above into a panicle of long 

 straight slender branches along which the heads are scattered; herbage 

 glabrous or the linear and entire leaves somewhat hirsute-ciliate; 

 smaller leaves with subsessile glands at apex; heads oval, 4 or 5 lines 

 long; rays 5 to 8, broad, 4 to 5 lines long; ray-achenes glabrous, tri- 

 angular, roughish and enclosed in boat-shaped bracts; bracts of the 

 receptacle lightly cohering to the top into a cup, separating in age; 

 disk-flowers 10 to 20; pappus of 7 to 10 unequal oblong fimbriate 

 paleae shorter than the achene, or rarely obsolete. — (Hemizonia 

 truncata Gray.) 



Dry hills in the North Coast Ranges: Napa Valley; Sonoma and 

 northward. Sept. 



2. C. pauciflora Gray. Branching freely, 10 to 18 in. high, the 

 branches diverging or zigzag and filiform; herbage sparingly hairy 

 and leaves (particularly about the heads or of the axillary fascicles) 

 stipitate-glandular; heads oblong, scattered along the branches (sub- 



