92 THE JOURNAL OF BOTAKT 



Spain, about which I should like enlightenment, would of course be 

 the determining factor in regard to its possible nativity in Cornwall 

 and the Channel Isles. — H. S. Thompson. 



I think Allium triqiietrum should be considered indigenous at 

 the Lizard ; I have found it by a stream between Kuggar and Kuan 

 Minor, where it seems unlikely to be an escape ; I have seen it in 

 gardens at Cadgwith and Mullion, but suggest that it may have been 

 introduced from the wild locality. — Harold A. BrittEi^. 



CrxosuRUS ECHINATUS IX Kent. In June 1916 my friend Mr. C. 

 J. Alexander sent me from Dover some specimens of this grass, which 

 he reported as occurring in " a considerable patch on the cliff above the 

 railway line between the Town Station and the Shakespeare's ClifE 

 tunnel." This mav be worth recording in view of the old entry in 

 a. E. Smith's Cat."' ph South Kent, 7 (1829)— " Said to have been 

 found near Dover," an entry which brought forth the remark in 

 Hanbury & Marshall's Fl. Kent, 400 (1899)—" Probably due to an 

 «rror." — C. E. Salmon. 



[Surely in each case the plant was a casual, hardly worthy of the 

 attention it has received. — Ed.] 



Viola bitpestris Schmidt, var. glabrescens Neuman. Violets 

 ■gathered in 1915 and 1917, in two spots near Chepstow, but in 

 v.c. 34 (West Gloucester) and in 1917 on the Cotteswolds in v.c. 33 

 (East G-.) were pronounced by Mrs. Gregory to be, not a form of 

 V. JRiviniana Reichb., but the above-named variety, to which 

 Mrs. Grregory refers in her British Violets. Any uncertainty which 

 she felt at first is now definitely removed by the sight of the 1917 

 specimens : her note on the specimens says " I have come to the 

 conclusion that true V. rupestris with its vars. and forms can be best 

 distinguished from V. Riviniana with its vars. and forms by its 

 broader, shorter and more sparsely fringed stipules, vvliich are often 

 almost entire." Mrs. Gregory tells me that she has also seen speci- 

 mens gathered in the Clova Hills. V. rupestris var. glahrescens also 

 occurs as f . alha (white flowered form) in v.c. 34< : and I have found 

 hybrids (and other intermediates) between it and V. Riviniana in 

 v.c. 34. Some account of the discovery is given in my " Report 

 (No. 6) on the progress made in connection with the Flora in 

 Gloucestershire " (Proc. Cotteswold Nat. Field Club, xix. 101 : 

 1917.— H. J. Riddelsdell. 



REVIEW. 



Plant Succession : an Analysis of tlie Development of Vegetation. 

 By Frederic E. Clements. Carnegie Institute of Washington, 

 Publication No. 242. Pp. i-xiii, 1-512. 

 In the preface to this excellent work the author tells us that it 

 ■" constitutes the general part of a monograph on Rocky Mountain 

 vegetation . . . The general principles advanced here are an out- 

 growth of the treatment," he says, in his Development and Structure 

 of Vegetation (1904) and Research Methods in Ecology (1905), in 

 which an endeavour to organize the whole field of present-day suc- 

 cession was made for the first time. The volume before us may not 



