North American Polygonaceae. 50 



The branching of the divisions of the scapes primarally separate 

 the two species ; that of the new species representing the scorpoid 

 dichotomy, while that of E. effusum represents forked dichotomy. 

 The specimens on which the species is founded were collected 

 by Walter Hough on the Fewkes Exploring Expedition in August 

 and September, 1896, on the Moki Reservation, northeastern Ari- 

 zona and the Little Colorado River. Number 30. 



Eriogonum curvatum. 



Perennial from a woody base. Stem branched, scaly, the 

 branches tufted : leaves crowded at the ends of the branches ; 

 blades elliptic, 5-10 mm. long, acute or acutish, densely tomen- 

 tose, short petioled ; peduncles wire-like, 5-1 5 cm. long, curved, 

 glabrous, simple below, forking above : bracts scale-like : involucres 

 sessile, scattered towards the ends of the scapes, turbinate- cam- 

 panulate, 2.5 mm. high, 5 -angled ; segments triangular, somewhat 

 unequal, obtuse, erect: calices pink, glabrous, 1.5-2 mm. long; 

 segments unequal, the 3 outer suborbicular, the 3 inner oblong, all 

 rounded at the apex : filaments glabrous : achenes 3-angled. 



At high altitudes, Long Meadow, Tulare County, California. 

 Summer. 



One of the numerous relatives of Eriogonum Wrightii and E. 

 ttachygonnm, but more delicate in habit than either of those species. 

 The lustrous wire-like scapes and glabrous filaments serve to sep- 

 arate it from its allies. The original specimens were collected at 

 Long Meadow, Tulare County, California, at an altitude of 2,800 

 meters, July 7-14, 1888, by Dr. Edward Palmer. Number 207. 



Eriogonum clavatum. 



Annual, acaulescent. Leaves basal; blades 5— 1 3 mm. broad, 

 much broader than long, undulate, strigose-hispid on both sides, 

 cordate at the base or rarely truncate ; petioles about twice as long 

 as the blades, hispid : scapes erect, solitary, glaucous, forked 

 above, the ultimate division filiform, the lower internodes more or 

 less swollen above the middle : bracts scale-like : peduncles hair- 

 like, y 2 cm. long, spreading : involucres narrowly turbinate, very 

 small, less than 1 mm. long; segments obtuse, as broad as long, 

 shorter than the tube : calices densely hirsute less than 1 mm. 

 long, the segments nearly equal, ovate-lanceolate, acutish : fila- 

 ments glabrous. 



Near Eriogonum capillare but leaf-blades much broader than 



long and the pubescent hispid. The smaller involucres and the 



hirsute calices are diagnostic. 



