IOWA ACADEMY OF SCIENCES. 91 



Vitis cinerea, Engehnanu. Muscatine; "On au island in Mississippi river, 

 opposite Fairport, Iowa." (Reppert.) 



^I^sculus glabra, Willd. Des Moines (Call); Keokuk; Boone (Budd); south 

 of Des Moines. 



Acer S2)icalum, Lam. Specht's Ferry and elsewhere along the Mississippi 

 River, north. 



Bh?is canadensis. Marsh. Cedar Rapids; dry, sandy embankments. 

 Ccrcis ca7mdensis. Muscatine; in rich forest soils most frequent at the base 

 of the hills along the Mississippi river, in more or less protected localities; 

 not coijimon; Keokuk; Hamburg (Hitchcock). Prof. Call informs me that a 

 very few trees also occur near Des Moines. 



Gymnocladics dioicus (L.), Koch. McGregor and North McGregor, Iowa. 

 I have reported it from La Crosse, Wisconsin. A few isolated groups and 

 specimens occur farther north and in the interior of Minnesota, according to 

 Upham. 



Gleditschia triacanthos, L. Muscatine; the form without spines, infre- 

 quent; the form with spines, frequent in rich, alluvial soil. Largest trees 

 from ten to sixteen inches in diameter, tifty to seventy-tive feet high; 

 Turkey?IRiver Junction, Ames and elsewhere in the interior of the State, 

 along streams. 



Morus rubra, L. McGregor; North McGregor; Ames. 



Eicoria tomentosa. Davenport; Iowa City (Hitchcock); Muscatine. 



H. pecan. Woodbury county (Hitchcock); Muscatine; Davenport (Fluke). 



Eicoria sulcata (Willd.), Britt. Muscatine; Reppert says: "Frequent on 

 the bottom lands and islands of the Mississippi river, from Fairport, Iowa 

 (nine miles above), to a point twelve miles below Muscatine. This tree is prob- 

 ably not found excepting in the islands in the river on the Iowa side. 

 Between these points it is confined mostlj' to the Illinois side of the I'iver. 

 On the Iowa side we have it mostly in the 'big timber' (twelve miles below 

 Muscatine), which is a track of well timbered bottom land extending down 

 the river about twenty miles. Individuals with leaflets 7-9 are not frequent, the 

 prevailing number being seven. E. pecan (not frequent) and E. minima are 

 the only hickories I have found associated with this species. I have not 

 found mature nuts of E. sulcata which show the four-ribbed characters. It 

 may be that this is shown in the immature form only as indicated in the 

 specimens collected in August. The chai'acter of the 'odd leaf sessile or sub- 

 sessile' as given in Wood's Class Book does not seem to agree with our 

 specimen. Large trees of this as also o^f the other species are becoming 

 rare owing to the merciless woodman's ax." 



Quercus palustris, Du Rois. Muscatine; common in bottoms along Mis- 

 sissippi and Cedar rivers. 



Q. bicolor, Willd. Muscatine, Turkey River Junction, Keokuk. 



Q. Muhlenbergii, Engelm. Boone, North McGregor, Fremont county 

 (Hitchcock), Keokuk (Rolfs). 



Q. imbricaria, Michx. Decatur county. Van Wert (Hitchcock). 



Bctula pajyyrifera, Marshall. Muscatine, Dubuque. 



B. nigra, L. Cedar Rapids; common in bottoms. North McGregor, 

 Muscatine, Streams; common. 



Pinus strobus, L. Clayton, Mitchell county (Zmunt); Davenport (Parry). 



