66 The Plant World. 



There are probably pockets or fissures in the rocks where Hypiis 

 and other plants obtain what they need, and the occurrence of 

 Celtis and Nicoiiana in washes looks to this also. 

 {Continued to April N timber.) 



MUTATION IN THE CENOTHERAS. * 

 By S. B. Parish. 



The present is the fourth fascicle of the Abbe L^veilld's 

 monograph, the publication of which was begun in 1902, and 

 brings it near completion. A final part, soon to appear, will 

 co:itain a general key, Latin diagnoses of the species, and other 

 supplementary matter. 



The author takes a most comprehensive view of the genus 

 CBnothera, not only rejecting the segregation proposed by Rai- 

 mann in thePflanzenfamilien,but includingGayophytum.Godetia, 

 Eulobus and Boisduvalia; a disposition not likely to be follow^ed 

 by the most conservative of field botanists. The numerous 

 text figures are mostly very good, especially some of those of 

 seeds. The photographs of herbarium sheets are of more uneven 

 merit. ]\Iaps of distribution are given for many species, re- 

 produced from those published in 1898, by Professor A. S. 

 Hitchcock. The value of the work is enhanced by the very full 

 citation of collections, and greatly diminished by the entire 

 absence of citations of place in the extensive synonymy. 



The present part devotes some interesting pages to an ac- 

 count of the author's experimental cultures of De Vries' mutants, 

 continued for five years in M. Leveille's own garden and at the 

 Jardin des Plantes at Le Mans. The species cultivated were 

 CEnothera Lamarckiana "a I'etat du mutation," (E. gigas, CE. 

 rubrinervis , OE. nanella and (E. cruciata, all grown from seeds 

 furnished by De Vries from his own cultures. 



Our space does not permit a detailed account of these ex- 

 periments, and we must content ourselves with a condensation 

 of some of the most important. 



The first year there appeared from the seed of CE. Lamarck- 

 iana a few specimens which differed from the parent, but which 

 seemed to Leveille mere sports or forms, and the same was the 



*Monograpbie du genre (Enothera, par Monseigneur H. Leveille. Le Mans, 1909. 



