TORREYA 



en 



CD 



DC 

 Q. 



/'pril, 1909 

 Vol. 9. No. 4. 



LIBRARY 



THE DISTRIBUTION OF THREE NATURALIZED new yom 

 CRUCIFERS BOTANIC/ 



(iARDEN 



By E. J. Hill 



Late in the autumn of 1906 I noticed a strange cruciferous 

 plant in a vacant lot near my home on the south side of the city 

 of Chicago. It was growing by the sidewalk and had been sub- 

 ject to such severe treatment by children who use such spaces 

 for playgrounds that I was not certain as to its specific identity, 

 except that it was a Diplotaxis. It was not observed the 

 next season, but it had survived and good specimens were ob- 

 tained the past summer which showed it was D. miiralis (L.) DC. 

 I have not seen it elsewhere nor heard of its presence hereabouts 

 from others. The range accorded it in Britton and Brown's 

 Illustrated Flora (1897) is: "Waste places and ballast, Nova- 

 Scotia to New Jersey and Pennsylvania, chiefly about cities." 

 This is substantially repeated in Britton's Manual (1901). The 

 Gray's New Manual (1908) says: " About Atlantic ports and 

 rarely inland," but without specifying how far from the coast. 

 In Beal's Michigan Flora (1904) a single station is given. Grand 

 Rapids, about the same distance from the coast as Chicago. Not 

 having been mentioned in previous editions of Gray's Manual, it 

 may be regarded as a comparatively recent introduction. As the 

 migration of adventive plants is a matter of interest it seems well 

 to record its appearance here. 



In 1890 I recorded the finding of another cruciferous plant, 

 Nastiirtmm sylvestre R. B., since called Roripa sylvestris (L. ) 

 Bess, and which now has another name, Radicula sylvestris (L.) 

 Druce, the common yellow cress. It was growing in the low 

 ground adjacent to Salt Creek, a tributary of the Desplaines 



[No. 3, Vol. 9, of TORREYA, comprising pages 45-64, was issued March 26,^ 

 1909.] 



65 



