AMMODIA. COMPOSITE 297 



ERIOCARPUM. 

 PYRROCO.M \ . 



spatulately oblanceolate, acute, green and granular-glandular beneath a 

 sparse rather stiffly hirsute pubescence, the leafy bracts subtending the 

 2 or 3 subsessile heads hirsute-ciliate, as are also the small outer bracts of 

 the tin inate involucre, the others merely granular viscidulous: rays very 

 few (about 5 to 8), deep yellow: pappus with an outer series of short very 

 narrow palese Banks of Hangman Creek, near Spokane, Washington. 

 C V Piper." 



5. A MM DIA Nutt. Trans. Am. Phil. Soc. n. Ser. vii 321. 



Somewhat viscid and pubescent perennials with entire leaves 

 and middle-sized, heads of yellow flowers terminating the stem 

 and branches. Heads many-flowered ; the flowers all perfect 

 and tubular. Scales of the compaiiulate involucre scarious- 

 membranaceous, 1-nerved, imbricated in few series,the outermost 

 shortest. Receptacle flat, alveolate- toothed. Branches of the 

 style subulate-filiform, the appendages longer than the stigmatic 

 portion. Achenes fusiform or somewhat compressed, pubescent. 

 Pappus of copious minutely scabrous capillary bristles. 



A. oresraua Nutt. 1. c. Chrysopsis Oregann Gray. Stems a foot 

 high, many from the same root, paniculately branched. leaves 

 alternate, oblong, entire, veiny, sessile: peduncles some- 

 what glandular; heads irregularly paniculate corymbose: 

 scales of the involucre linear or lanceolate, 1-nerved, the inne most as 

 long as the flowers, the outermost short and appressed : corollas all similar, 

 slender, slightly dilated upwards, 5-toothed, pale yellow nearly hid in the 

 copious white pappus. On gravelly bars along streams, Washington to 

 California. 



6 ERIOCARPUM Nutt Trans. Am. Phil. Soc. vii, 32L. 



Perennial or annual herbs with spiimlose-dentate leaves and 

 (in ours) rayless heads of yellow flowers. Heads many-flower- 

 ed: involucre hemispherical, its bracts rigid appressed-imbricate 

 with the outer successively shorter, all with abrupt and more or 

 less spreading herbaceous tips. Disk corollas narrow merely 5 

 toothed. Achenes densely silky, mostly short and turbinate. 

 Pappus white, of very unequal usually short and somewhat flat- 

 tened awn like barbellate bristles. 



. E. griudelioides Nutt. 1. c. Aplopappm XuttaUU T. cC* G. Cinereous- 

 tomentose, becoming glabrate in age : stems 6-12 inches long, numerous 

 from a woody caudex : leaves from spatulate oblong to almost lanceolate, 

 rather sparsely pectinately dentate: heads few, terminating the branches, 

 8-10 lines high : involucre hemispherical, its bracts rather few ranked, and 

 with slightly spreading greenish tips: style appendages oblong-lanceolate. 

 Idaho to the Saskatchewan, New Mexico and Arizona. 



7 PYrtROCOMA Hook. Fl. 1, 306. 



Perennial rigid herbs with simple stems, coriaceous alternate 

 leaves and showy heads of yellow flowers terminal or in the axils 

 of the upper leaves. Heads many-flowered, radiate. Bracts of 

 the hemispherical or campanuiate involucre rigid, some/vhat foli- 

 aceous, nerveless, oblong with more or less squarrose or herbace- 

 ous tips, lieeeptacle flat, alveolate -toothed. Ray-flowers nuin- 



