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. 



J Eriogonum orthocaulon sp. nov. 



Perennial with woody rootstock and caudices which are densely 

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

 ous ; blades typically oval, mostly 1-1.5 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. Osterhont, 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, Maconn 24.4.80 and 

 24481. 



This species is related to Eriogonum ovalifolium and E. oc/iro- 

 lencum, 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, 1 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 



