(114) 
glandular viscid spot on the dorsal side; flow- 
ers rose, purple or whitish.—Presidio. Oak- 
land. Summer. 
7. C. Brewert 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. Spotrep THISTLE. 
Aiqualis. Pappus o-seriate. Bristles rigid. 
Filaments monadelphous.—©. Flowers pur- 
ple. 
1. S. Marianum Gertn.—Common. Sum- 
mer. 
Native of the Mediterranean region. Seeds 
of the plant used as an antispasmodic. 
62. Centaurea L. Srar-Tuistie. 
Frustranea. Aiqualis. Involucre imbricate. 
Ray-flowers funnel-shaped. Pappus of o, sca- 
brous, filiform bristles. 
1. C. Benpicra L. Akenes terete; flowers 
yellow.—©. 
Ballast-weed. Introduced from the Mediter- 
ranean region. Summer. 
2. CO. mevitensis L. Akenes costate. Flow- 
ers yellow.—©. 
