138 RypDBERG: Rocky MOUNTAIN .FLORA 
LIMNIA L. (Kongl. Sv. Vet. Ak. Hand. 1746: 130. . 1746); 
Haw. Syn. Pl. Succ. 11. 1812. 
Greene, Howell and Robinson have transferred a number of 
species from C/aytonia to Montia; but none of them has given 
any obvious reason. Dr. Greene satisfied himself by transferring 
the sections ALsINASTRUM, NalocrENE and Monriastrum. These 
evidently come nearest to Montia of all the sections of C/aytonia. 
Prof. Howell, followed by Dr. Robinson, also transferred the sec- 
tion LimniA, and the rhizomatous species of Euctayronia of Gray. 
The difference between the two genera Claytonia and Monta as 
now limited is practically reduced to the number of ovules; 6 in 
the former, 3 in the latter. In Montia we find now both regular 
and irregular flowers, free petals and partly united petals, 5 sta- 
mens and 3 stamens, opposite stem-leaves and alternate stem- 
leaves, annuals and perennials, and of the latter several kinds, viz., 
with horizontal rootstocks, with short stolons bearing offsets, with 
slender runners bearing cormlets at the ends, or with axillary bulb- 
lets. In the olden time, Montia was easily distinguished from 
Claytonia by its gamopetalous corolla cleft on one side. It may be 
that all the sections mentioned above should be removed from 
Claytonta, but they should not be transferred to Montia, making 
this genus more unnatural than C/aytonia ever was. I think that 
in a family like Portulacaceae, in which the modifications in the 
flowers are so slight, generic characters should to some degree 
be sought in the general habit. Instead of transferring the sec- 
tions to Montia it would have been better to restore the Linnaean 
genus Limnia (which was adopted by Haworth), and to include in 
it all the American species of Montia, except VW. fontana ; or else 
to continue the splitting and propose several new genera. The 
typical Rocky Mountain species of Lémmuia are the following : 
: Limnia asarifolia (Bong.) Rydb. 
Claytonia asarifolia Bong. Veg. Sitcha 137. 1831. 
Limnta srpirica (L.) Haw. Syn. Pl. Succ. 11. 1812. 
Claytonia sibirica L. Sp. Pl. 204. 1753. 
Limnia arenicola (Henderson) Rydb. 
Claytonia a etnoones Henderson, Bull. brain d Club 22: 49. 1895: 
