488 



Cruciferae 



Lepidium 



50 



Map 999 



Lepidium virginicum L. 



50 



Map 1000 



Lepidium densiflorum Srhrad. 



aspi arvense L. 



Nat. of Eu. ; N. B. and N. S. to Ont. and Kans., southw. to Va. and 

 along the Pacific coast. 



2. Lepidium Draba L. Hoary Cress. Map 998. This species was 

 reported by Hansen in 1927 from Wabash County and in 1925 from Rush 

 County. In 1933 I visited both of these stations and found it to be per- 

 sisting and spreading as a common weed. In 1935 it was detected along 

 State Road 116 in Wells County by Lawrence E. Hicks of Ohio State Uni- 

 versity. A large colony was found on the south side of the road in the 

 southwest quarter of sec. 28, west of the railroad and about 200 feet from 

 where the road turns from a westerly direction to the northwest. The 

 colony was about 150 feet long and was mostly on the right of way of 

 the road with only a few plants in the border of the adjacent field. Nieuw- 

 land has collected it along a roadside north of Angola, Steuben County. 



Nat. of Asia; local from N. Y. to B. C, southw. to Washington, D. C. 

 and Calif. 



3. Lepidium virginicum L. var. typicum C. L. Hitchcock. PEPPER- 

 GRASS. Map 999. Frequent throughout the state. Found everywhere ex- 

 cept in dense woodland and in very wet places. 



Que. to Minn, and Colo., southw. to Fla., Tex., and Mex. ; also intro- 

 duced as a weed into W. I. and Eu. 



4. Lepidium densiflorum Schrad. var. typicum Thellung. {Lepidium 

 apetalum Willd.) Map 1000. This species is probably local or frequent 

 throughout the state in habitats similar to those of Lepidium virginicum 

 from which it can sometimes be separated only with difficulty. 



Nat. of Eurasia; Maine to Ont. and B. C, southw. to Va., Tex., and 

 Nev. 



2903. THLASPI [Tourn.] L. 



Pods elliptic, about 1 cm wide; seed rugose; lower leaves wing-petioled, the upper 

 ones sagittate-clasping 1. T. arvense. 



Pods obovate-orbicular, about •"> mm wide; seed smooth; leaves sessile, the upper 

 ones subperfoliate 2. T. perfoliatiim. 



