IOWA ACADEMY OP SCIENCES. 
109 
Muscatine, the only radical difference shown in our flora is 
that occurring along the Missouri. About twenty-five western 
and northwestern species occur and, according to the list of 
Mr. Bush, nearly the same species occur from Sioux City, Iowa, 
to St. Joseph, Mo. The region is not entirely devoid of 
trees, in its northern portion, between the steep mounds a var- 
iety of bur oak {Quercus macrocarpa var. olivaeformis) , Slippery 
elm (Ulmus fulva)^ Cottonwood {Populus mooiiliflera) , Plum 
(Primus Americana)^ Basswood (Tilia Americana), box elder 
(Negundo aceroides), occur. Several shrubs also occur; Grape 
(Vitis ripfaria), climbing bittersweet (Celastrus scandens), wahoo 
(Euonymus atropuTjmreus). South, the timber area is more 
extensive, as at Council Bluffs and Missouri Valley. At Gien- 
wood and Logan there are fine specimens of Quercus ruhra, 
Tilia Americana orad. Ulmus fulva. They are abundant from one - 
half to two miles from the hills. The trees on the loess about 
Turin and Sioux City are broad and spreading. 
Of the peculiar herbaceous plants, I shall content myself by 
giving a list. The beautiful Spanish bayonet (Yucca ongusti- 
folia) so abundant everywhere in the west. The Aplopapjms 
spinulosus forms dense mats on the tops of the mounds. Grin- 
delia squarrosa, now naturalized in other parts of Iowa. Liatris 
punctata, Eupliorhia marginata, E. Jieteropliylla, a beautiful blue- 
flowered lettuce (Lactuca pulchella) , Gaura coccinea, so abundant 
everywhere in Nebraska and in the Rocky mountain region. 
Oxybaplius angustifolia, Helianthus Maximiliani, Lygodesmia 
juncea, an abundant plant of the plains now exerting itself with 
great force in the cornfields of northwestern Iowa. The 
beautiful Mentzelia ornata is confined to Cedar Bluffs along the 
Big Sioux a few miles north of Sioux City. Cleome integri folia, 
the celebrated Rocky Mountain bee plant. Two species of Dalea 
(D. alopecuroides and D. laxiflora) the Loco weed (Oxptropis 
Lamberti) and Astragalus lotiflorus, var. brachypus. Professor 
Hitchcock records Stip>a comata, which belongs chiefly to the 
Rocky Mountain region and rarely found in eastern Nebraska. 
Sliepherdia argentea occurs along the Missouri near Sioux City 
undoubtedly a waif from the northwest. 
I may also add a gamma grass peculiar to the west, most 
common species of Nebraska (Bouteloua oligostacliya) Buffalo 
grass (Buchloe dactyloides) from Lyon county. The most abun- 
dant grasses on the hills are Andropogon scoparius, Bouteloua 
racemosa, quite common in many parts of Iowa. Muhlenbergia 
