TREES OF McGregor district 
267 
Mountain ash (Pyrus americana (Marsh) D. C.), along Yellow 
river, rare. 
European mountain ash {Pyrus Aucuparia L.), occasionally 
escaped from cultivation. 
Service berry (Ameianchier canadensis (L.) Medic), common, 
rocky woods and hillsides. 
Red haw {Crataegus mollis (T. & G) Scheele). 
Red haw {Crataegus punctata Jacq.) 
Red haw {Crataegus coccinea Mill). 
Wild plum {Prunus americana Miarsh), common, forming 
thickets. 
Black or rum cherry {Prunus serotina Ehrh.), common. 
Red or pin cherry {Prunus pennsylvanica L. f.), not infre- 
quent. 
Kentucky coffee tree {Gymnocladus dioica (L.) Koch), banks 
of Mississippi river. 
Honey locust {Gleditsia triacanthos L.), banks of Mississippi 
river. 
Black locust {Robinia Pseudo-Acacia L.), escaped from culti- 
vation. 
White or silver maple {Acer saccharinum L.), alluvial bot- 
toms, common. 
Sugar maple {Acer saccharum Marsh), the common hard 
maple. 
Black maple {Acer nigrum (Michx) Britton), along Yellow 
river, less common than the sugar maple. 
Box elder {Acer negundo L.), common. 
Basswood {Tilia americana L.), common, upland woods. 
Black ash {Praxinus nigra Marsh), low swampy grounds, com- 
mon. 
White ash {Praxinus americana L.), tops of hills and sides, 
generally in exposed places, srhall tree, nearly its northern limit. 
Green ash {Praxinus lanceolata (Borkh.) Sarg.), common, 
alluvial bottoms and streams. 
Red ash {Praxinus Pennsylvanica (Marsh)), not certain of its 
occurrence, branches and petioles velvety pubescent. 
