(114) 



glandular viscid spot on the dorsal side; flow- 

 ers rose, purple or whitish. — Presidio. Oak- 

 land. Summer. 



7. C. Breweri Gray. Bracts of the involu- 

 cre bearing on their dorsal side, near the tip, 

 an oval, viscid, glandular spot; bracts much 

 appressed, coriaceous, outer bracts tipped with 

 a squarrose, slender prickle; flowers pale, pur- 

 ple or whitish. — Tamalpais. Summer. 



61. Silybum Vaill. Spotted Thistle. 



Squalls. Pappus oo-seriate. Bristles rigid. 

 Filaments monadelphous. — 0. Flowers pur- 

 ple. 



1. S. Marianum Gaertn. — Common. Sum- 

 mer. 



Native of the Mediterranean region. Seeds 

 of the plant used as an antispasmodic. 



62. Centaurea L Star-Thistle. 



Frustranea. iEqualis. Involucre imbricate. 

 Bay-flowers funnel-shaped. Pappus of oo, sca- 

 brous, filiform bristles. 



1. 0. BENDICTA L. Akenes terete; flowers 

 yellow. — 0. 



Ballast-weed. Introduced from the Mediter- 

 ranean region. Summer. 



2. C. MELiTENSis L. Akeues costate. Flow- 

 ers yellow. — 0. 



