10 
ARABIS, L. Eock Cress. 
68. A. ludovieiana, Meyer. 
Sandy soil; rare. May — June. 
Niles. Biverside, Babcock. 
^ 64. A. hipsuta, Scop. 
Sandy soil; infrequent. May — June. (B.) 
Evanston. Hyde Park. Riverside, Bastin. Grand Crossing, Hill. 
65. A. laevigata, Poir. Smooth Eock Cress. 
Prairies; not common. May — June. 
Evanston, infrequent. Riverside, Babcock. Riverdale, Bastin ! 
Highland Park, Lake Co., Illinois, Hill . Rosedale, Brennan. 
I 66, A. canadensis, L. Sickle Pod. 
South Chicago, July, 1875, Dodge; 1870, Hill. ,(B.) 
67. A. perfoliata, Lam. Tower Mustard. 
* Turritis glabra , L. 
A single specimen was found near L. S. & M. S. R. R. depot, South 
Chicago, in 1887. (B.) 
Chicago, June 20th, 1875, Babcock , in Herb, of Northwestern University. 
Evanston, Boltwood. Lakeside, Johnson. 
/ 68. A. COnfiniS, Watson. Drummond’s Tower Mustard. 
A. drummondii, in Manual, 5th Ed. 
Turritis stricta, Graham. 
Sandy soil; nowhere common. May — June. (B.) 
Evanston. Quarry, near Crawford, 1886, on C. B. & Q. R. R. North- 
ern Illinois, Vasey , — Grays Manual , 5th Ed., p. 69, 
|^69. A. lyrata, L. 
Sandy soil; frequent. April — May. 
E vansto n and vicinity. Hyde Park and southward. Riverside. 
Palatine. 
I 70. A. dentata, T. & G. 
Riverside, Babcock. 
DRABA, Dill. 
71. D. caroliniana, Walt. Whitloe Grass. 
Sandy fields ; frequent. March — May. 
Evanston. Calumet. South of Calumet, Babcock. University 
Campus, Chicago, Bastin. 
Leaves often toothed. Petals emarginate, Stony Island, Hill! 
Petals wanting in later racemes, Englewood, Hill. 
