Arabis 



Cruciferae 



507 



Arabis laevigata 



Jan. 



Feb. 



Mar. 



Apr. 



May 



June 



July 



Aug 



Sept. 



Oct 



Nov. 



Dec. 



Miles 



~50 



Map 1045 



Arabis glabra (U Bernh. 



Arabis Drummondi 



6. Arabis laevigata (Muhl.) Poir. Smooth Rockcress. Map 1044. 

 Frequent but never common throughout the state. It prefers a rather 

 sandy or gravelly soil and is restricted to the wooded slopes and high banks 

 of streams. The leaves of this species are variable and one form has been 

 named. I am including it under the species. 



Western Maine to S. Dak., southw. to Iowa and Ark. 



7. Arabis glabra (L.) Bernh. Tower Mustard. Map 1045. Infrequent 

 to rare in the lake region of the state and extremely rare, absent, or intro- 

 duced in the southern part. My Floyd County specimen was found in a 

 hayfield along Indian Creek near Galena. Several specimens were noted. 



N. B. to B. C, southw. to n. N. J., Pa., the Great Lakes, S. Dak., Utah, 

 and Calif. 



8. Arabis Drummondii Gray. Drummond Rockcress. Map 1046. I 

 found two colonies of this species in gravelly soil on the slope of the 

 north bank of the St. Joseph River, one about a half mile and one a mile 

 and a half southwest of Bristol. Nieuwland's report for it from St. Joseph 

 County is the only other record. 



Lab. to B. C, southw to N. S., s. N. E., N. J., Ohio, 111., Utah, and Calif. 



9. Arabis lyrata L. Lyreleaf Rockcress. Map 1047. Found in very 

 dry, sandy soil in black oak woods and fallow fields and on open wooded 

 dunes and sandy, roadside knolls. 



Ont. to Man. and Alaska, southw. to Conn., Va., Tenn., and B. C. 



10. Arabis canadensis L. Sickle-pod. Map 1048. Infrequent to rare 

 throughout the state; probably absent from some of the central counties. 

 It prefers a dry and rather sandy soil and is found on the crests of wooded 

 ridges and on rocky, wooded slopes. 



Eastern Mass., Vt., and Ont. to Minn., southw. to Ga., Tex., and Kans. 



3004. ERYSIMUM [Tourn.] L. 



Petals mostly 20-30 mm long, orange yellow; pedicels and pods in our specimens 

 ascending; pods 4-sided, 6-10 cm long 1. E. asperum. 



