COMPOSITE. 401 



2. F. GALiiiCA, Linn. Mant. ii. 481 (1771). Receptacle nearly plane: 

 heads pentagonal-conical: outer achenes completely enclosed in their 

 condiiplicate at length indurated bracts. — Introduced from Europe, but 

 not rare with us. 



37. STTLOCLINE, NaUall. Low and diffuse white-woolly annuals. 

 Heads terminal, subglobose, the broad thin bracts both of involucre and 

 columnar receptacle deciduous with the mature fruit; those of the fertile 

 flowers involute or saccate-conduplicate, embracing the obovate or 

 oblong obcompressed achene (this without pappus); those of the few and 

 central sterile flowers plane or concave; the rudimentary ovary of these 

 flowers with a pappus of few caducous bristles. 



1. S. giiaphalioides, Nutt. Trans. Am. Phil. Soc. vii. 338 (1840); 

 Gray, Pac. R. Rep. iv. 101, t. 13. Stems 2—4 in. long; leaves linear or 

 oblong: bracts hyaline, woolly on the back. — From Monterey and the 

 San Joaquin southward. 



38. HESPEREVAX, Gray. Low but rigid, leafy, with heads axil- 

 lary and terminal. Bracts of the involucre and those of the receptacle 

 subtending the pistillate flowers from oblong to obovate, becoming 

 coriaceous, persistent, concave. Receptacle slender columnar from a 

 broader base, sparsely villous, the pistillate flowers and their bracts 

 crowded at its base; the summit bearing a whorl of 3 — 7 coriaceous 

 obovate or rounded open bracts subtending a few sterile flowers; these 

 with cleft style but no ovary. Achenes pyriform obovate, somewhat 

 obcompressed, very smooth. Pappus none. 



1. H. caulescens, Gray, Proc. Am. Acad. vii. 356 (1868); Benth. PI. 

 Hartw. 319 (1849), under Psilocarphus. Evax mvolucrata, Greene, Man. 

 185 (1894). Stout, strictly erect, 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 con- 

 spicuous whorl of 15 or 20 leaves, these of firm texture, with spatulate- 

 obovate cuspidate blade I2 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. 

 May. 



2. H. hiimilis. Evax acaulis, Greene, Bot. Gaz. vii. 256 (1882) excl. 

 Syn.; Man. 184. Stout and low, the very short branches horizontal: 

 leaves thin and flaccid, with short blade and greatly elongated petiole, 

 this less dilated at base: heads glomerate at the ends of all the branches, 

 none in the axils. — Moist plains near Antioch, and southward. April — 

 June. 



