1907] Hall. Compositae of Southern California. 37 



6. GRINDELIA Willd. GUM PLANT. 



Coarse herbs or suffrutescent plants, the California species all 

 perennials. Basal leaves commonly petioled; the cauline sessile 

 by a broad base. Herbage in ours glabrous or nearly so but 

 balsamic-viscid. Heads gummy, medium-sized or large, in pan- 

 icles or cymes, rarely solitary or sessile, ours with conspicuous 

 yellow rays. Involucre campanulate or hemispheric ; the bracts 

 many-ranked, firm-herbaceous, often with attenuate squarrose 

 points. Style-appendages lanceolate or linear. Achenes short, 

 truncate, compressed or turgid, glabrous. Pappus of 2 to 8 awns 

 or small scales, very readily deciduous. Involucral cups of the 

 budding heads often completely filled with the white or cream-like 

 gummy exudation, and it is probably this gum, also present in 

 the leaves, that gives to the genus its reputed medicinal value. 



Leaves 2 to 8 cm. wide: insular species 1. G. latifolia. 



Leaves narrower, sometimes linear, rarely over 2 or 3 cm. wide. 



Stems woody below: leaves linear-oblanceolate or cuneate: salt-marsh 



species 2. G. cuneifolia. 



Stems herbaceous throughout. 



Involucre 20 to 25 mm. broad: cauline leaves 1 to 3 cm. wide 



3. G. robusta. 



Involucre 10 to 15 (rarely 20) mm. broad: cauline leaves .5 to 1.5 cm. 

 wide 4. G. camporum. 



1. G. latifolia Kell., Proc. Calif. Acad. v. 36 (1873) ; Greene ; 

 Pitt. i. 89 (1887). 



Stout but herbaceous throughout, 4 dm. or more high : basal 

 leaves elliptic or obovate, 5 to 15 cm. long in addition to the 

 winged petiole of equal length ; cauline leaves broadly ovate or 

 oblong, very obtuse, the base broad and clasping, 4 to 8 cm. long, 

 1.5 to 5 cm. broad, closely and regularly serrate : heads in leafy- 

 bracteate cymes : involucre broadly hemispheric, 10 to 15 mm. 

 high, about 20 mm. broad; outer bracts with slender recurved 

 tips; inner bracts erect: rays about 1.5 cm. long: pappus-awns 

 5 to 8. 



Santa Rosa Island, 1872 or 1873, Harford (type) ; Santa 

 Rosa Island, Jun., 1888, Brandegee; San Miguel Island, Sept.. 

 1886, Greene. These specimens were examined at the Herbarium 



