STYLOCLINB COMPOSITE 325 



PSILOCARPHU8 



gon and California. 



23 STYLOCLIXE Nutt. Trans. Am. Phil. Soc. viii, 338. 



Low floccose-woolly annuals with entire alternate leaves and 

 small heads of inconspicuous flowers in glomerate clusters. 

 Heads many-flowered ; the pistillate flowers with filiform corolla, 

 several or many, in two or many series on the columnar receptacle, 

 each with the ovary and achene loosely enclosed in the base or 

 body of an ovate broadly boat-shaped chaff or scale of the recepta- 

 cle, of scarious or firmer membranaceous texture : the hermaphro- 

 dite but sterile flowers few in the centre, on the narrow summit of 

 the receptacle, involucrate but not enclosed by the 4or 5 merely 

 concave scales of the receptacle, their tubular corollas 4-5-toothed. 

 Bracts of the involucre hyaline and inconspicuous or hardly any. 

 Achenes obovate or oblong with a narrow ba're, slightly oblique 

 or straight, the areola terminal. Pappus none to the achenes, 

 commonly a few caducous scabrous bristles around the sterile 

 flowers. 



Ours of ANCISTEOCARPHUS Gray. Fertile flowers 5-10, their 

 chaffy scales in not more than two series, boat-shaped and invol- 

 ving the achene, of firm-membranaceous texture, and with a 

 hyaline tip ; the 5 uppermost scales sterile and larger, forming 

 an involucre around the sterile flowers, open, tapering into a 

 rigid incurved hooked cusp, persistent, and at length stellately 

 spreading. 



S. fllaginea Gray Proc. Am. Acad. viii, 652 Canescent with a fine 

 and appres>ed wool : stems slender, 1-10 inches high, erect, or diffuse and 

 and branching from the base : leaves narrowly linear or somewhat dilated 

 upward, 6-8 lines long: involucre outside of the woolly fructiferous scales 

 obscure or none : pappus to sterile flowers none, On dry stony hillsides, 

 southwestern Oregon and California. 



27 PSILOCARPHUS Nutt. 1. c. 



Low floccose-woolly annuals with entire mostly opposite leaves 

 and small heads of inconspicuous flowers in terminal capitate 

 clusters and in the forks of the branching stems, involucrate by 

 the upper leaves. Heads discoid, many-flowered ; the pistillate 

 flowers with filiform corolla, numerous, in several series on the 

 depressed-globose receptacle, each loosely enclosed in an obovate 

 or semicordate hooded-saccate visiccular or inflated chaff or scale 

 of membranaceous texture clothed with soft wool, its apex in- 

 trorse and more or less beaked with a hyaline scale ; the her- 

 maphrodite but sterile flowers few and naked in the centre, with 

 tubular 4-5-toothed corolla. Bracts of the involucre few, small, 

 scarious' Achenes oblong or cylindraceous and moderately com- 

 pressed, straight, small and loose in the sack of the scale, which, 

 is more or less open down the inner face. Pappus none. 



* Leaves all tapering below; the midrib not prominent: canescent 

 with close wool throughout: fructiferous bracts not over a line long. 



