314 THE JOUENAL OF BOTANY 



interdiiin obsoletse. Flores S ' Sepala rotundato-rhomboideo-ovata, 

 margitie irregulari denticulata. Bi^actecd et sepala coccinea. 



Hah. John Crow Peak, Blue Mts., 6000 ft. Harris, 12,906 ! 



We have received this specimen from the Jamaican Herbarium 

 under the name of Gymnantlies alpina Britton, and refer it to Den- 

 drocousinsiay owing to the structure of the male flowers. 



ACALTPHA L. 



AcALTPHA YiRGATA L. var. PUBESCEXS, var. nov. Hamuli, petioli, 

 nervique dense pubescentes. Folia utrinque sparse pubescentia ; 

 petioli 2-8*5 cm. 1. SpiccB femineae usque ad 8 cm. 1. Bractece 

 feminese hispidulse. 



Hah. Clavei-ty Cottage, Blue Mts., J. P. 1421, Hartl 



WATSON BOTANICAL EXCHANGE CLUB KEPORT. 



The Thirty-fourth Annual Report of the Watson Botanical 

 Exchange Cluh for 1917-1918 contains as usual much interesting 

 material contributed by our leading British botanists There are 

 valuable notes on critical genera and species : Mr. Groves's on 

 Banunculus (Batrachiti?n),^r. Mojle Rogers's and Mr. Riddelsdell's 

 on Buhtcs, Major WoUey-Dod's on Rosa, Mr. Barton's on Sali- 

 cornia,Sind Mr. Pugsley's on Orchis inaij be mentioned as examples of 

 the former and Mr. Salmon's on Arahis hirsuta, Mr. Little's on 

 Brunns insititia, Mr. Marshall's on Byrus By raster, Mr. White's 

 on Brunella laciniata, and Messrs. Little and Jackson's on Alnus 

 r/lutinosa of the latter. Space will not allow us to quote these at 

 length, but a few points ma}^ be noted. Mr. Groves makes useful 

 suggestions : thus of Banunculus fluitans var. camhricuSy sent by 

 Mr. Griffiths from the original Anglesey locality, he writes : " This 

 curious plant has always been a puzzle, and it would be of great 

 interest to ascertain if its peculiarities are due to ecological factors 

 by cultivating it under different conditions, especially in running 

 water. If the Batrachian Banunculi could be grown on an extensive 

 scale I believe many of our difficulties in connexion with this group 

 of plants would be solved." GormwQwim^ o\\ B. peltatus \M\fori- 

 hundus, sent by Mr. White from W. Glos., he says: ''The peltatus- 

 like form with shorter peduncles, which I understand b}' the name. 

 A beautiful specimen, showing what can be done by careful floating 

 out, in marked contrast to the draggled apologies for specimens one 

 so often has to examine. There is no group of plants that better 

 repay care than the aquatic Baminculi. It seems to me that it is 

 worth while in the case of these and other water plants to float them 

 out ; the trouble is not great, especially when one is dr^^ing a number, 

 and the results are far more satisfactor}^ than if the plants are 

 merely spi-ead out as in the case of land plants." On a plant from 

 West Hoathley, Sussex, he comments: " A weak state of B. peltatus 

 with unusually small flowers, or a hybrid with that species as a parent. 

 The aquatic Banunculi hybridise freely, and, whenever specimens are 



