(98) 
23. Franseria Cav. 
Moneecious. ¢ head o-flowered. Scales of 
the involucre united into a cup. Palew of the 
flat receptacle filiform. ? head 1—-, sometimes 
2-4-Hlowered. Scales of the involucre united 
into a cup; if the cup be more than 1-flowered, 
forming as many cells as there are flowers. 
Involucre armed with o rows of spines. Akenes 
enclosed in the persistent involucre.——2f. 
1. F. srpmynatiripa Less. Leaves 2-3-pin- 
nately divided.—Sand dunes, San Francisco. 
Summer. 
2. F. Cuamissonis Less. Leaves cuneate to 
ovate, obtusely serrate, the lower sometimes 
laciniate.—Sand dunes, San Francisco. Sum- 
mer. : 
24, Xanthium Tourn. CocKLEBUR. 
Moneecious. ¢ head o-flowered. Scales of 
the involucre I-seriate, distinct. Receptacle 
cylindrical, paleaceous. ? head 2-flowered. 
Seales of the involucre united into a cup, armed 
with hooked spines. Corolla filiform. Akenes 
enclosed in the persistent involucre.—©. 
1. X. strumarium L. Leaves gréen on both 
sides, scabrous, irregularly serrate. — Road- 
sides. Common. Summer. 
2. X. sprinosum L. Leaves whitish beneath, 
most of them deeply lobed.—Waste grounds. 
Common. Summer. 
