TREES OP THE MISSOURI BASIN 
43 
americana of the family Tiliaceae is common throughout the en- 
tire region. 
Of the Leguminosae there are three native species; the coffee 
bean ( Gymnocladus dioica) , the honey locust ( Gleditsia triacan- 
thos) and the red hud {Gercis canadensis), the latter of which 
occurs in Fremont county. The three species are, of course, 
southern. The black locust {Rohinia pseudacacia) is widely 
naturalized. The sycamore {Platamis occidentalis) of the family 
Platanaceae is common in Fremont county; hut probably does 
not extend much beyond this county. Of the family Juglan- 
daceae black walnut (Juglans nigra) is the most widely dis- 
tributed, and extends from Fremont to Lyon counties, but is 
more common in the south than in the north. The pignut {Gary a 
cordiformis) is common from Fremont county to the Okoboji 
and Spirit Lake region. Macbride reports G. ovai a from Sac 
and Ida counties. It occurs in Fremont county. There are no 
localities reported between Fremont, Sac and Ida. Probably 
it is rare and belongs to the Mississippian flora of those counties. 
The dogwoods {Gornaceae) have been somewhat puzzling. The 
most widely distributed species is the 0 . asperifolia. This is 
common everywhere in the loess bluffs. The G. amamum, with 
brownish branches and pale blue fruit, occurs in the region but is 
rare. G. stolonifera is reported from Dickinson and Osceola 
counties and from Calhoun county by Macbride. One of us 
has seen it on the shores of Iowa Lake. This locality belongs 
to the Mississippian flora. It is probably a mistaken identifi- 
cation. 
Fitzpatrick expresses considerable doubt as to the occurrence 
of Quercus velntina in western Iowa. We have not seen the 
species, though it was reported by Shimek from Harrison county. 
The Geltis occidenialis var. reticulata we think should be re- 
ferred to G. occidentalis. The variety puhescens of Geanathus 
ovatus we believe is the species. Prunns cMcasa is certainly not 
native; it probably is an escape. Boot reports Garya glabra 
ar.i the variety villosa. We believe this to be G. cordiformis. 
The occurrence of Lonicera SullivanUi reported by Shimek and 
Fitzpatrick is out of its range, since it does not occur in central 
Iowa where one would expect to find it with other northern 
plants. Rosa woodsii, reported also by the same observers, is 
similarly interesting since this is a northern species. 
