§24 
514. 
BULLETIN UNITED STATES GEOLOGICAL SURVEY. 
BETULACEA. 
Betula occidentalis, Hook. 
1874. August. Rocky Mountains. 
SALICACEA. 
. Salix lucida, Muhl. 
1873. August. Mouse River. 
. Salix rostrata, Richardson. 
1873. Jtly. Pembina, in fruit. 
. Salix nigra, Marsh. 
. Populus balsamifera, L., var. candicans. 
. Populus monilifera, Ait. 
. Populus tremuloides, Mx. 
CONIFER. 
. Pinus Banksiana, Lambert. 
. Pinus contorta, Doug. 
. Pinus resinosa, Ait. 
. Abies Douglasii, Lindl. 
1874. Rocky Mountains. 
. Abies alba, Mx. 
. Abies Engelmanni, Parry. 
. Abies nigra, Torr. 
. Abies balsamea, Marshall. 
. Larix Americana, Mx. 
. Thuja occidentalis, L. 
. Juniperus communis, L. 
1874. August. Rocky Mountains. 
. Juniperus Sabina, I. 
1874. August. Base of Rocky Mountains. 
. Juniperus Virginiana, L., var. procumbens. 
ARACEAE. 
. Ariscema triphyllum, Torr. 
1873. July. Pembina. 
. Calla palustris, L. 
. Acorus Calamus, L. 
LEMNACEA. 
. Lemna trisulea, L. 
1873. Pembina, with Ranunculus cymbularia. 
. Lemna minor, L. 
TYPHACEA. 
. Typha latifolia, L. 
. Sparganium simplex, Huds. 
1873. July. Pembina. 
Sparganium eurycarpum, Eng. 
Sparganium natans, L. 
