1907] Hall. Composite of Southern California. 221 



TRIBE 9. SENECIONEAE. GROUNDSEL TRIBE. 



89. RAILLARDELLA Gray. 



Ours a low scapose perennial of the Alpine Zone, with entire 

 silvery-tomentose leaves and solitary heads. Involucral bracts 

 barely overlapping. Receptacle flat. Heads discoid in our 

 species. Disk-corollas with short tube, elongated throat, and 5 

 short naked teeth. Style-appendages flattish, with lanceolate or 

 cuspidate tips. Achenes linear, pubescent. Pappus of 12 to 25 

 slender soft-plumose bristles. 



1. R. argentea Gray, Bot. Calif, i. 417 (1876). Raillardia ar- 

 gent ea Gray, Proc. Am. Acad. vi. 550 (1865). 



Scapes 1 to 10 cm. high, from creeping rootstocks : leaves 

 crowded in a basal tuft and on short sterile shoots, linear-spat- 

 ulate to oT^lanceolate, acute, from less than 1 cm. to 4 or 5 cm. 

 long: involucre narrowly campanulate, 8 to 10 mm. high, its 

 bracts acuminate: flowers yellow. 



Known to occur in Southern California only on the summit 

 of Mt. San Gorgonio (Grayback), where a depauperate form is 

 common in gravelly soil above timber line : plentiful in the high 

 Sierra Nevadas. 



90. LEPIDOSPARTUM Gray. 



Ours a rigid broom-like shrub with alternate leaves, all but the 

 earliest of which are reduced to scales. Bracts of the involucre 

 regularly imbricated in 3 or 4 series, chartaceous, oblong, obtuse. 

 Receptacle naked. Heads discoid. Corolla with long tube; the 

 short campanulate throat exceeded by the spreading lobes. 

 Anthers exserted, sagittate at base, the tips lanceolate. Style- 

 branches flattish, with acute tips. Achenes terete, faintly 8 to 

 10-nerved. Pappus of numerous minutely scabrous capillary 

 bristles. 



1. L. squamatum Gray, Proc. Am. Acad. xix. 50 (1883). 

 Linosyris squamata and var. Breweri Gray, 1. c. viii. 290 (1870). 

 Tetradymia squamata Gray, Bot. Calif, i. 408 (1876). 



A round-topped bush, 1 to 2 m. high, with ascending virgate 

 branches : very young plants tomentose and leafy with spatulate 



