508 



Cruciferae 



Erysimum 



o 50 



Map 1047 



Arabis lyrata L 



Petals less than 10 mm long, lighter yellow than the preceding. 



Pedicels stout, 1 mm or more thick, almost as thick as the pod, widely spreading or 



ascending, 4-8 cm long; petals 6-9 mm long 2. E. repandum. 



Pedicels slender, ascending, mostly about 0.5 mm thick, about half as thick as the pod. 



Petals 4-5 mm long; lower pedicels mostly 10-15 mm long. . . .3. E. cheiranthoides. 



Petals mostly 6-8 mm long; lower pedicels less than 10 mm long. (See excluded 



species no. 274, p. 1053.) E. parviflorum. 



1. Erysimum asperum DC. (Cheirinia aspera (DC.) Britt. of Britton 

 and Brown, Illus. Flora, ed. 2.) WESTERN WALLFLOWER. Map 1049. Some- 

 what frequent on the limestone ledges of the Wabash River west of Logans- 

 port ; a few plants on a rocky, wooded slope along the Wabash River east 

 of Wabash ; and infrequent in gravelly soil of the slope and top of the high 

 bank of Big Wea Creek about 4 miles southwest of Lafayette. Blatchley 

 reported it as scarce on gravelly banks in Vigo County. It has also been 

 reported from Carroll, Montgomery, and Putnam Counties. The mass dis- 

 tribution of the species is west of our area and it is no doubt very local 

 in Indiana, with reports from two counties in Ohio. 



Newf., Que., Sask., Colo., southw. to Ohio, Ind., 111., and N. Mex. 



2. Erysimum repandum L. (Cheirinia, repanda (L.) Link.) Treacle 

 Mustard. Map 1050. I have found this species along a roadside, in ballast 

 along a railroad, and in a waste place. No doubt it has a much wider dis- 

 tribution than the map indicates. 



Nat. of Eu.; waste places about eastern seaports, and Ohio to Kans., 

 Ariz., Utah, and Oreg. 



3. Erysimum cheiranthoides L. (Cheirinia cheiranthoides (L.) Link.) 

 Wormseed Mustard. Map 1051. This species prefers a muck soil and is 

 fast becoming established in the lake area. Where it has become well 

 established, it forms a complete and dense stand. I found a pure stand 

 of it about three miles north of Albion, Noble County, in muck soil 

 in a low place in an oatfield where the oats had been drowned out. Its 

 habit of germinating late in the season permits it to occupy low places in 



