794 REPORT OF STATE GEOLOGIST. 



C. flava Ait. Summer or Yellow Haw. 



This species is of occasional occurrence in the State. Speci- 

 mens received from the southeastern part of the' State during 

 the past season are to be referred to this species. Its occurrence 

 in onr area is exceptional. It grows in dry, sandy soil, in shaded 

 places. 



Flowering specimens collected in May. 



Dearborn (Collins). 



DRUPACE.E. Plum Family. 

 PRUNUS L. 

 P. Americana Marsh. Wild Yellow or Red Plum. Horse Plum. 



Well distributed through the State, but nowhere especially 

 abundant. It is usually found along streams in rich soils. It 

 rarely exceeds a trunk diameter of twelve inches. The wood is 

 very strong and susceptible of a high polish. It is largely used 

 in the manufacture of handles for tools. 



Flowers in April and May; fruit ripens in August and Sep- 

 tember. 



Tippecanoe (Cunningham): Kosciusko (Coulter); Cass (Hess- 

 ler); Jefferson (Barnes); Putnam (MacDougal); Jay, Delaware, 

 Randolph, and Wayne (Phinney); Gibson and Posey (Schneck); 

 Noble (Van Gorder); Franklin (Meyncke); Monroe and Vigo 

 (Blatchley); Hamilton and Marion (Wilson); Steuben (Bradner). 



P. ANGUSTIFOLIA Michx. 



(P. Chicasa Michx.) 



Of rare occurrence in the southwestern counties of the State. 

 It is reported as growing on dry. rather rocky slopes. I have seen 

 no specimens and the species is admitted upon the authority of 

 the collectors. 



Flowers in April; fruit ripens in July. 



Gibson (Schneck). 

 P. pumila L. Sand Cherry. Dwarf Cherry. 



Found only on the southern shore of Lake Michigan. The 

 species is a member of the dune flora, and according to Dr. 

 Cowles plays a certain part as a dune builder. 



Flowers in April and May; fruit ripens in August. 



Porter (Cowles); Lake. 

 P. Pennsylvania L f. Wild Red Cherry. 



Exceptionally found in a few counties of the State, in dry, 

 coarse soils. Usually not exceeding twenty-five feet in height. 



Flowering in May and June; fruit ripens in August. 



Kosciusko (Chipman); Jay, Delaware, Randolph, and Wayne 

 (Phinney). 



