Small : North American Polygonaceae 53 



upper part of the peduncle and that of the involucres is more ap- 

 pressed and silky than the pubescence of E. lachnogynum. 



Eriogonum orthocaulon sp. no v. 



Perennial with woody rootstock and caudices which are densely 

 leafy at the ends (section Hcterosepahx). Leaves usually numer- 

 ous ; blades typically oval, mostly I — 1.5 cm. long, or rarely 

 smaller, densely felty-pubescent, but usually rather more thinly so 

 above than beneath, terminating long curved or somewhat curled 

 petioles : scapes mainly 1—3 dm. long, simple, floccose, each ter- 

 minating in a head of several involucres, which is subtended by 

 minute or thick-subulated bracts : involucres turbinate, sometimes 

 angled and thus turbinate-obpyramidal, about 7 mm. long, prom- 

 inently ribbed, floccose, the lobes mostly broader than long and 

 much shorter than the tube : calyxes ochroleucous, becoming 

 4.5—5 mm. long, the outer sepals suborbicular to ovate-orbicular, 

 the inner linear-cuneate to pandurate, about as long as the outer : 

 filaments slightly pubescent at the base : ovary and styles gla- 

 brous : achenes not seen. 



The type was collected at Rifle, Garfield county, Colorado, 

 June 23, 1900, by Geo. E. Ostcrhoitt, no. 2125. Specimens have 

 been collected elsewhere as follows : 



Idaho: Foothills, June, 1892, Mulford. Blue Lakes, June 2, 

 1893, Palmer 62. Idaho Falls, July 4, 1901, Merrill & Wilcox 

 782. Utah: Salt Lake City, May, 1869, Watson 10 16. Al- 

 berta: Crow Nest Pass, August, 1897, Macoun 244.80 and 

 244.81. 



This species is related to Eriogonum ovalifolium and E. ocliro- 

 leucum, but from both of these it may be distinguished by the large 

 involucres. 



Eriogonum coloradense sp. nov. 



Perennial (section Capitata). Depressed stems branched at the 

 base ; branches tufted, 1-4 cm. long, clothed with the persistent 

 leaf-bases : leaves crowded ; blades narrowly spatulate to linear- 

 spatulate, 2-5 cm. long, blunt, slightly revolute, webby-pubescent 

 above or at length glabrous, 51 densely white lanate-tomentose 

 beneath, except the prominent midrib, narrowed into petiole-like 

 bases which are dilated and scarious at the base : peduncles 

 simple, mostly surpassed by some of the leaves, relatively stout, 

 lanuginous, the pubescence becoming floccose : involucres in heads 

 terminating the peduncle, campanulate, about 5 mm. long, thinly 

 woolly without ; lobes suborbicular or nearly reniform, barely one 



