POLYGONACEiE. 441 



This genus is nearly related to Polycnemum and Hemichroa; and has 

 also a strong resemblance to Bklimoenemis of Ghenopodiacem, of which 

 it was considered a species by Nuttall. We think, however, that it 

 belongs to Amaranthacew, and that it is distinct from Banalia, as was 

 suspected by Moquin. 



[Dr. Torrey had characterized this as a new genus ; but, as it has 

 now already been published by Mr. Watson, as above, the name and 

 technical character given by the former become superfluous.] 



Ord .69. POLYGONACEA 



1. ERIOGONUM, Michx* 

 1. Eriogonum spmrocephalum, Dougl in Bentli. 



^ Hab. Spipen River, Washington Territory.— A diffusely branched 

 little shrub, seldom rising more than 6 inches above the ground. 

 Leaves three-fourths of an inch long, and about 2 lines wide. Head 

 of flowers three-fourths of an inch in diameter. Tube of the perianth 

 attenuate below and into a short stalk which is articulated to the 

 pedicel. 



* A monograph of this genus, and the tribe it mainly represents, was published in 

 the year 1870, in the Proceedings of the American Academy of Arts and Sciences, 

 vol. 8, pp. 145-200, under the title of A Revision of the Eriogonece, by John Torrey 

 and Asa Gray. And the new species of the present collection had also been commu- 

 nicated to Mr. Bentham long before, and published in the fourteenth volume of De 

 Candolle's Prodromus. Accordingly no characters are given in the present enumera- 

 tion, and the synonymy is omitted as now superfluous. One or two points of difference 

 between the Kevision and the present account (which it is not worth while to harmonize) 

 are explained by the fact that, while this account was prepared several years ago bv 

 Dr. Torrey, the Revision was wholly written by his associate. 



Ill 



