North American Polygonaceae. 52 



The original specimens were received from Dr. Ebert, U. S. A.,, 

 who collected them at San Carlos, Arizona, in September and 

 October, 1893. 



Eriogonum trinervata. 



Annual, slender, acaulescent. Leaves basal ; blades suborbi- 

 cular or orbicular-ovate, 1-2 cm. broad, obtuse at the apex, trun- 

 cate or subcordate at the base, ciliate, pubescent with scattered 

 hairs, conspicuously 3-nerved, these impressed above, prominent 

 beneath ; petioles hispid below, widely forking above, the ulti- 

 mate divisions filiform: involucres goblet-shaped on spreading 

 filiform peduncles 6-15 mm. long, glabrous, 1-1.5 mm. long, with 

 an undulate border : calices deep pink, glabrous, nearly 2 mm. 

 long ; segments rounded at the apex, the 3 outer oblong, the 3 

 inner ovate : filaments short, glabrous: achenes 3-angled, glabrous. 



In dry soil, Cimarron, Colorado. Summer. 



A beautiful species related to Eriogonum subreniforme, but more 

 robust in habit. In place of the densely tomentose leaf-blades of 

 E. subreniforme, E. trinervatum has glabrous leaf-surfaces, except a 

 few scattered hairs on the lower side. The blades are never cor- 

 date, as they are in its relative. The calices are at least twice the 

 size, and the segments of the inner and outer series of entirely dif- 

 ferent shapes. 



The type was collected by Professor Greene, at Cimarron, 

 Colorado, August 25, 1896. 



Eriogonum turbinatum. 



Annual, stoutish, acaulescent. Leaves basal ; blades subor- 

 bicular, variable in size, some about 1 cm. broad, others 3-4 

 cm. broad, all more or less apiculate at the apex, softly tomen- 

 tose on both sides, deeply cordate at the base ; petioles about' 

 as long as the blades and tomentose like them : scapes erect, stout, 

 solitary or several together, 2-4 dm. tall, forking above, the 

 branches ascending: bracts scale-like: peduncles ascending or 

 spreading : involucres shorter than the peduncles.^turbinate, 2 mm. 

 long, glabrous ; segments usually 5, broadly ovate, obtuse, scarious- 

 margined, shorterthan the tube : calices glabrous, pink, about 2 mm. 

 long; segments unequal, the 3 outer suborbicular, cordate, fila- 

 ments short, glabrous : achenes 3-angled, nearly 2 mm. long, with 

 an obovoid base, beaked. 



In habit Eriogonum turbinatum resembles E. deflexum, though 

 more robust, while in floral characters it is allied to E. Hookeri. 

 The suborbicular outer calyx-segments readily separate it frorrt 



