236 University of California Publications in Botany. 



San Diego, Brandegee (distr. by Baker under no. 3414 as 8. 

 aphanactis Greene, but rays present!); Saugus, Davy. Native 

 of Europe and Asia. 



11. S. vulgaris L., Sp. PL 867 (1753). COMMON GROUNDSEL. 



An erect annual, 1 to 3 dm. or more high : herbage somewhat 

 succulent, glabrous or with a little loose tomentum : leaves sessile, 

 auricled, pinnatifid, the lobes oblong and with irregularly dentate 

 margin : heads in terminal cymose clusters : involucre 6 or 7 mm. 

 high ; principal bracts about 20, their tips black and often penicil- 

 late ; small outer bracts several, black : achenes slightly pubescent. 



Common in waste places, flowering throughout the year. 

 Native of Europe. 



S. PARRYI Gray. The report that this Senecio grew in the 

 San Bernardino Mts. was, with scarcely a doubt, due to an error 

 in the label. 



TRIBE 10. CYNAREAE. THISTLE TRIBE. 



96. ARCTIUM. BURDOCK. 



Coarse biennials, unarmed except for the hooked tips of the 

 involucral bracts forming the bur. Leaves large and roundish, 

 the lower on stout petioles. Heads hemispheric, medium sized, 

 pink or purplish. Keceptacle densely setose. Filaments glab- 

 rous. Achenes oblong. Pappus of numerous short and rigid or 

 chaffy bristles falling separately. 



1. A. Lappa L., Sp. PI. 836 (1735). 



Plant usually 1 or 2 m. high : leaves more or less cordate at 

 base, mostly green above, white-tomentose beneath : involucral 

 bracts narrow, green and smooth, strongly uncinate. 



An European weed, now establishing itself near a deserted 

 garden at West Riverside, Jul., 1907, Reed. 



97. CARDUUS L. THISTLE. 



Spiny herbs with mostly lobed or pinnatifid alternate or basal 

 leaves, all of ours more or less tomentose. Heads large, solitary 

 or clustered, homogamous (rarely dioecious) ; the flowers white, 

 reddish, or crimson. Involucral bracts imbricate, the outer ter- 



