r>4 Small : North American Polygonaceae 



third as long as the tube : calyxes pink or pinkish, fully 4 mm. long 

 at maturity ; lobes blunt, the outer broadly ovate or orbicular- ovate, 

 the inner smaller than the outer, oblong, the midrib vanishing 

 below the apex : filaments slightly pubescent near the base : ovary 

 and styles glabrous : achene 3-angled. 



Collected on Mt. Harvard, Colorado, 1896, by Frederic E. 

 Clements, no. 66. 



Related to Eriogomtm pauciflornm, but stouter and larger in all 

 of its parts. The peduncles are mostly shorter than the leaves, 

 which generally have flat instead of strongly revolute blades. 

 The involucre of this species is narrower and much longer than 

 that of E. pauciflornm and has the tube proportionally longer and 

 the lobes proportionally shorter. The calyx too is at least one 

 millimeter longer than that of E. pauciflornm. 



Eriogonum nudicaule (Torr.) 



Eriogonum effusum nudicaule Torr. Pacif. R. R. Rep. 4: 132. 



1857. 



Related to Eriogonum loncJiophyllum T. & G., differing in the 



larger calyx, the campanulate involucre and the revolute leaf- 

 blades. 



Eriogonum scoparium sp. nov. 



Perennial, with woody rootstocks and more or less elongated 

 caudices (section Corymbosd). Leaves rather few on each caudex, 

 but sometimes apparently numerous on prolifically branched 

 plants ; blades linear to linear-spatulate, 2-5 cm. long, revolute, at 

 least in age, densely lanate beneath, floccose above, relatively 

 short-petioled, the sheathing bases of the petioles very densely 

 woolly: scapes mainly 1—2 dm. tall, glabrous, glaucescent, each 

 topped with a compound open cyme, the bracts very small, the 

 lower ones often subulate-tipped : involucres broadly campanulate, 

 2.5-3 mm - l° n g> ar >d about as wide at the mouth, the lobes broad, 

 decidedly shorter than the tube : calyxes pink or whitish, becom- 

 ing 3.5-4 mm. long, the lobes oblong to obovate : filaments pu- 

 bescent at the base: ovary and styles glabrous: achenes 2.5 mm. 

 long. 



The type was collected at Gunnison, Colorado, September 12, 

 1 90 1, by Undertvood & Selby, no. 376; other collections from 

 Colorado are as follows : Gunnison, July 7, 1901, Baker 254. 

 Denver, September, 1892, Eastwood. 



This species may be distinguished from Eriogonum nudicaule 



