6 Leaves g-ranked, nearly uniform. 
9. L. tristachyum Pursh. 
Lycopodium tristachyum Pursh, 1814. Fl. 2: 653. 
Underw. in Britt. Man. 1037. 
L. chamaecyparissus A. Braun, 1843. in Doell, 
Rhein. Fl. 36. Underw. Nat. Ferns 136. 
£. complanat. chamaecyparissus Eaton, in Gray 
Man. 697. Underw. in Ill. Fl. 1: 43. 
Plants similar to the preceding species from which it 
differs by its narrower branches and its nearly uniform 
leaves. The rootstocks of this species are 2 dm or longer 
and are found at a depth of 2 cm. or more. 
In woods. “On high mountainsin 
Virginia, near Sweet Springs” Purshl.c. 
I have observed this species on dry slopes in the region 
occupied by Pinus virginiana. It is abundant on the 
mountain side at Clifton Forge, Va., with P. pungens. 
28. SELAGINELLA Beauv. 1805. 
Small moss-like plants with numerous, branching 
stems. Leaves mostly minute, scale-like, 4-many-ranked. 
Sporangia axillary. 
} Leaves appressed. 
1. S. rupestris (L.) Spring. 
Muscus terrestris repens Virginianus &c. Moris. 
Bist O2A sect ak tem Gentor. 
Lycopodium rupestre L. Sp. Pl. 1101. 
62 
