af 
186 
the spreading short jointed form as the type of a species, the slender 
erect one has been made a variety, following Torrey in Flora North. 
U.S., 273. Linnaeus’ Queria Canadensis appears from his descrip - 
tion to have been the slender form. My experience with the plants 
has been just that of Mr. Redfield as related by him in the paper 
above cited, except as to the length of the calyx lobes, which I 
find to be variable in both species. That the difference between 
the two is not caused by habitat alone—though it may well have 
originated from some such cause—is indicated by the occurrence 
of A. capillacea in open fields formerly covered by forest but from 
which the trees have been removed many years. We should ex- 
pect to find the plants assuming the spreading, pubescent form 
under these conditions if habitat was the sole agent in the varia- 
tion, but I am well satisfied that this does not take place at the 
present time. I have also noticed A. capillacea growing as a weed 
in gardens. 
As to the distribution of the species, A. .capillacea is certainly 
most abundant northward, extending to southern New Jersey 
and Pennsylvania and probably much farther southward, and 
westward to Missouri; A. dichotoma appears to be of more south- 
ern distribution, but is found in New York and New England. 
A partial bibliography, as I understand it, is as follows:— 
A, dichotoma, Michx., Flor. Bor. Amer., i., 113; Pursh, Flor. 
Amer. Sept.,':; 176; Reem. & Schultes,“ SystisVeoy vie 525 5 
Torrey, Flora North. & Mid. U. S., 273; Flora N. Y.,i., 105; 
DeCandolle, Prodr., iii, 369; Beck, Bot., 131; Torr. &. Gray, 
Flora N.A., i., 172; Darlington, Flora. Cestr., 162; Gray, Man., 
Ed. 1848, 65; Ed. 1867, 96; Wood, Class Book, Ed. 1855, 185; 
Chapm., Flora South. U. S., 46; Young, Flora Texas, 174; Red- 
field, Bull. Torr. Bot. Club, vi., 61,62; Schrénk, 1. ci, 297; 
Kellerman, Plant Anal., 165. 
A. Canadensis, Ell., Sketch, i., 307°; Hook., Flor. Bor. Amer., » 
i., 226; Darby, Bot. Scie Me S., 243. 
Queria Canadensis, Nutt., Gen., 158; Barton, Comp. Flora 
Phil., i., 74; Eaton, Man., 2nd Ed., 394; 6th Ed., 295. 
Paronychia Canadensis, Wood, Bot. &. Flor., 58; (this des- 
cription would include both species ; his var. pumila is probably 
but a form of A. dichotoma). 
