238 Part III. Chapter 3. 
demissa, Ribes aureum, Rhus aromatica var. trilobata (= R. trılobata), 0 
an interesting ecologic association. The plants found near the buffalo wz 
formerly constituted a noteworthy element distinct from the true prairie flo 
the front of the buffalo’s head. Such plants as Asclepias syriaca, Chenopodi 
album, Martynia proboscidea (= M. louisiana), Lippia cuneifolia, P ke 
Ecke crus-galli, Rhus glabra, and species of the following gene 
Trifolium, Thlaspi, Amarantus, Sinapis, Portulaca, Cenchrus, Stipa, Se ar 
Elymus, Dactylis, Deschampsia, Euphorbia, Glycyrrhisa, were thus carried, 
the capsules of Martynia proboscidea (= M. louisiana), and the fruit of 
Glycyrrhisa, Styrax, Setaria, Elymus, Helianthus, Rhus trilobata, Obione ( 
plex) canescens, Amaranthus, Chenopodium and the hispid twigs of Eu 
have been taken from the matted hairs around the head of the male b 
ceous woody plants, a prairie element, and a foot hill element. 
one may add a Rocky mountain eleriehe; represented by the pine bluff 1 
mation along the Niobrara, and a nertiiert element represented by Bet 
papyrıfera, which also takes part in the Mississippi basin vegetation- -ele mi 
of the region®),. The trees representing the Mississippi basin element & 
most entirely confined to narrow belts which border the streams in the can 
They are Ulmus americana, U. fulva, Negundo aceroides (= Acer negl 
Fraxinus viridis, Fraxinus ERERE Celtis occidentalis. 
The species occurring in the sandy hills which are proper to or 
frequent in the foot hills are the following: 
ÄAster canescens Pursh. 
Cactus (Mammillaria) viviparus Nu 
»  longifolius Lam. 
Clematis ligusticifolia Nutt. 
Oenothera (Anogra) albicaulis Pursh. Cymopterus montanus Torr. & GI 
er frigida Willd. Campanula rotundifolia L. 
canadensis Michx. Crepis runcinata James. 
kan alnifolia Nutt. Carduus ochrocentrus A. Gray. ji 
Astragalus missouriensis Nutt. Chrysopsis villosa Nutt. - N P 
» mollissimus Torr. A. | 
Berula erecta Coville (= B. angusti- en villosa Nutt. v. caneı 
folia Mert. & Koch). > var. sessilifol 
Bromus Kalmii A. Gray. Oheilanibies gracilis Mett. =C 
> Porteri Nash. Cleomella angustifolia Torr. Bi > 
r) BERTHOLD, A. C.: Botanical Gazette XVII: 321—326. ı8 Be 
2) PouND, RoSCOE and CLEMENTS, FREDERIC E.: The ET of Nebraska 
