GNAPHALIACE.E. 185 



3. E. involucrata. Stout, strictly e>ect, simple, or rarely with one or 

 more ascending long branches from the base, 8 in. high or more: heads 

 only in a terminal hemispherical cluster % in. broad, surrounded by a 

 conspicuous whorl of 15 or 20 leaves, these with spatulate-obovate cuspi- 

 date blade Y 2 in. long, only a third the length of the slender petiole, this 

 abruptly dilated at base to half the width of the blade; cauline leaves 

 shorter and narrower. Plains of the lower Sacramento; collected only 

 by the author. May. 



25. FILAGO, Tourn. Erect rather slender floccose-woolly herbs, 

 with alternate and entire leaves, and small heads in capitate lateral and 

 terminal clusters. Bays 0. Eeceptacle plane, hemispherical or subcon- 

 ioal; its naked summit bearing both sterile and fertile flowers having a 

 pappus of capillary bristles. Base of receptacle bearing pistillate flowers, 

 the achenes from these being destitute of pappus and enfolded by a 

 concave bract. Achenes terete or slightly compressed, sometimes 

 roughish-papillose. 



1. F. Californica, Nutt. A span high or more: heads ovate, slightly 

 angular: convex: pistillate fl. 810, their bracts broadly ovate, deeply 

 boat-shaped, incurved; inner bracts oblong, concave: achenes almost 

 terete, obscurely pappillose-granular. Dry hills. May. 



2. F. GAKLICA, L. Eeceptacle nearly plane: heads pentagonal-conical: 

 outer achenes completely enclosed in their conduplicate at length 

 indurated bracts. Introduced from Europe, but not rare with us. 



26. GrtfAPHALIUM, Diosc. Floccose-woolly. Leaves sessile, entire. 

 Heads cymosely clustered, white, yellowish or rose-tinted. Eeceptacle 

 flat, naked. Bracts of involucre scarious, imbricated. At least the 

 outer flowers (usually all of them) fertile. Achenes terete or flattish. 

 Pappus a single series of scabrous capillary bristles. 



* Pappus-bristles not united at base, falling separately. 

 +- Plants dioecious. 



1. (jr. Americanum, Clusius (1601). G. margarilaceum, L. Erect, 1 

 2 ft. high, growing in tufts from a perennial root, equably leafy up to the 

 terminal cymose corymb; white-floccose, except the glabrate upper sur- 

 face of the broadly lanceolate leaves; broadest leaves 3-nerved: bracts of 

 involucre pearly- white, radiating in age. Common about the Bay, on 

 wooded or bushy northward slopes of hills. 



i -) Heads heterogamous; all the flowers fertile. 

 M- Involucre woolly at base only. 



2. G. inicrocephalum, Nutt. Biennial, slender, with several erect 

 branches 2 ft. high or more, loosely corymbose-paniculate above, the 



