418 Madieae 



toothed, narrowed to the connate base; heads on peduncles 4-8 

 cm. long, erect, nodding in fruit; outer involucral bracts 4-8, 

 foliaceous, reflexed; the inner bracts 8, membranous, acutely 

 oval; rays golden-yellow, ovate-oblong, 2 cm. long; chaff linear, 

 equaling the disk-flowers; achenes black, flat, 5 mm. long; awns 

 2, 3 mm. long, or with a third half as long, awns and edges of the 

 achene retrorsely barbed. 



Frequent in shallow streams about San Bernardino, apparently less com- 

 mon toward the coast. August-November. 



2. B. pilosa L. Annual ; stems erect, usually branched from 

 the base, 4-6 dm. high, glabrous or sparsely pilose-pubescent ; 

 leaves pinnate, pilose-pubescent; leaflets 3-5, irregularly serrate 

 or incised, 15-25 mm. long; heads scattered, few, 10-12 mm. 

 broad; rays none; achenes narrow, linear, about 1 cm. long. 

 Frequent along streets and irrigating ditches. Native of tropical America. 



34. BEBBIA Greene. 



Much branched suffrutescent plants with few mostly 

 opposite narrow leaves, and scattered discoid heads. 

 Involucre campanulate, its bracts imbricated in 3-4 

 series, the inner somewhat scarious and striate. Recep- 

 tacle chaffy ; the chaffy bracts persistent, lanceolate, 

 partly embracing the achenes, nearly equaling those of 

 the involucre. Corollas tubular, yellow. Achenes tur- 

 binate, slightly obcompressed. Pappus consisting of 1 

 series of long rather stout plumose bristles. 



1. B. juncea (Benth.) Greene. Much branched from a woody 

 base, 10-15 dm. high ; flowering branches rush-like, nearly leaf- 

 less, pale green and glabrous or minutely and sparsely scabrous ; 

 leaves mainly opposite, linear; heads scattered, terminating the 

 branchlets, 1 cm. high; pappus-bristles equaling the slender 

 corollas ; achenes appressed-pubescent. 



Occasional in dry washes. Santiago Canyon, Santa Ana Mountains, Geis; 

 Highlands. 



Tribe 6. MADIEAE. TARWEED TRIBE. 



Annual or perennial herbs, with usually glandular 

 viscid or heavy-scented herbage. Leaves alternate or 



