258 NINETEENTH REPORT. 



here where they often grow together and it seems to me that P. atropur- 

 purea is but a pubescent form of P. melanocarpa; the size and form of 

 the leaves and the color of the fruit are essentially the same in both ; 

 the berries of the variety are larger than those of the type^ globose or 

 occasionally oval. In the species the leaves and inflorescences are 

 glabrous ; in the variety more or less tomentose ; but there are inter- 

 mediate formS;, and individual shrubs have some of the leaves and in- 

 florescences tomentose while others are glabrous. It seems best, on the 

 whole, to consider P. atropurpurea as not specifically distinct from 

 P. melanocarpa. Bloomfield, No. 4200, June 15, 1916, and No. 4396, 

 August 22, 1916; Vic. Palmer Park, No. 4276, July 2, 1916, and No. 

 4406, August 27, 1916 (some parts pubescent and others glabrous). 



GERANIACEiE. 



Geranium pusillum Burm. f. 



Banks of Detroit River in Detroit. Considered to be adventive but 

 apparently spreading. No. 4367, July 13, 1916. 



TITHYMALACE^. 



Euphorbia glyptosperma Engelm. 



Along the railroad tracks at Farmington where it is quite frequent. 

 No. 4350, August 12, 1916. 



ZIZYPHACE^. 



Rhamnus cathartica Lin. 



A few shrubs are found scattered along a rail fence dividing pasture 

 meadows. Probably from seed dropped by birds. No. 4392, August 22, 

 1916. 



SALICARIACE^. 



Lythrum Salicaria Lin. 



In vicinity of Detroit. No. 4404, August 24, 1916. Probably an 

 escape from cultivation. 



CORNICULATACEiE. 



Oenothera muricata Lin. var. parviflora Gates. 



A narrow leaved, small flowered form of OE. muricata. Frequent 

 along banks and in fields at Rochester. No. 44151^? Sept. 3, 1916; 

 Belle Isle, Detroit, 195a, August 4, 1912; in a marl bed on Parkedale 

 Farm, No. 3829, August 9, 1914. 



