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52. Soliva Ruiz & Pavon. 



Necessaria. Superflua. Ray-flowers GO, with- 

 out corolla. Style scarcely bifid, persistent. 

 Receptacle flat, naked. Akenes obcompressed, 

 winged, crowned by the style, sessile, pappus 

 0. 0. Flowers inconspicuous. 



1. S. SESSILIS Ruiz & Pavon. Moist grounds 

 near the coast. All the year round. 



53. Cotula L. BRASS-BUTTONS. 



Superflua. Corolla of ray-flowers wanting. 

 Receptacle flat, naked, papillose. Akenes com- 

 pressed, winged, those of the ray stipitate; 

 pappus 0. 0. Flowers yellow. 



1. C. CORONOPIFOLIA L. Leaves pinnatifid. 

 Aquatic. All the year round. 



2. C. AUSTBALIS Hook. Leaves bipinnatifid; 

 lobes linear. Waste places. All the year 

 round. 



54. Tanacetum L. TANSY. 



^Equalis. Superflua. Ray-flowers not ligu- 

 late. Receptacle convex, naked. Akenes an- 

 gulate, with large epigynous disc. Pappus 

 coroniform, or 0. 2. Flowers yellow. 



1. T. CAMPHORATUM Less. Suffrutescent. 

 Sand dunes near San Francisco. Summer. 



55. Artemisia L- WORMWOOD. SAGE-BRUSH. 

 ^Equalis. Superflua. Necessaria. Ray 

 flowers tubular. Scales of involucre dry, with 



