Hall. Compositae of Southern California. Ill 



34. GNAPHALIUM L. CUDWEED. EVERLASTING. 



Woolly herbs with sessile and commonly decurrent leaves. 

 Heads white, yellowish, or rose-tinted, disposed in panicles, 

 cymes, or spikes. Receptacle flat or convex, not chaffy. Invo- 

 lucral bracts scarious, imbricated. Pistillate flowers in several 

 series, with filiform corollas. Central flowers hermaphrodite- 

 fertile, with tubular 5-lobed corollas and entire obtuse styles. 

 Pappus a single series of capillary bristles. 



Pappus-bristles united at base, falling away in a ring: inflorescence spike- 

 like: low herb.... 1. a. purpureum. 



Pappus-bristles not united at base, falling separately. 



Involucre imbedded in loose wool, its inconspicuous bracts brown except 



at the scarious tips: low branching annual 2. G. palustre. 



Involucre woolly only at base, its bracts scarious. 



Herbage in age becoming green (at least the upper surface of the 

 leaves), somewhat glandular. 



Eoot perennial: stems woody below 3. G. bicolor. 



Eoot annual or biennial: stems herbaceous throughout. 



Inflorescence cymose: involucre broad; bracts white: var. 



Californicum of 4. G. decurrens. 



Inflorescence paniculate: involucre narrow; bracts rose-color 



or white 5. G. ramosissimum. 



Herbage persistently white-woolly throughout, scarcely glandular. 



Involucre bright white: heads in loose panicles 



6. G. microcephalum. 



Involucre greenish-yellow or rusty: heads in close glomerules 



..7. G. Chilense. 



1. G. purpureum L., Sp. PL 854 (1753). PURPLE CUDWEED. 



Root perennial : stems commonly several, simple, from an erect 

 or slightly decumbent base, 1 to 3 dm. high: herbage canescent 

 with a close dense coating of white wool, the upper surface of the 

 leaves usually early glabrate: leaves broadly spatulate, obtuse, 

 2 to 5 cm. long and 3 to 12 mm. wide : heads crowded in a spike- 

 like inflorescence which is dense and oblong, or rarely more elong- 

 ated and more or less interrupted : involucre about 5 mm. high, 

 brownish or purplish: achenes sparsely scabrous. 



In saline and alkaline soil : San Diego, Cleveland; Claremont, 

 Shaw; near Santa Barbara and on Santa Rosa Island, Brandegee. 



