﻿dying out, the hybrid was increasing by its ability to grow more 

 freely under the very conditions which were destroying one of its 

 parents. Every field-botanist can call to mind similar instances; 

 in Potamogetons they are frequent ! 



In a genus the species of which are so widely distributed as 

 those of Potamogeton are, we must not expect to find "endemic" 

 forms at all frequent. When the genus is more carefully collected, 

 will a single species be found restricted to any one locality, or wide 

 district even? Many of the so-called species will be found to 

 be combinations of other species— that is, hybrids. I propose to 

 write the name x Potamogeton lanceolatus, and think that it is likely 

 to occur wherever the two parents grow ; if this view is correct, the 

 importance of its distribution ceases, as far as geographical botany 



FIRST RECORDS OF BRITISH FLOWERING PLANTS. 

 William A. Clarke, F.L.S. 



Salix.— In this genus I deal only with the seventeen species to 

 which it has been reduced by Dr. Buchanan White in Journ. Linn. 

 Soc. xxvii. 333-457. 



Salix pentandra L. Sp. PI. 1016 (1753). 1641. "Salix 

 folio laureo, sive lato glabro odorato folio, nondum descripta. 

 Willow Bay."—Johns. Merc. Bot. pars alt. 32. "At Wolver- 

 hampton."— How, Phyt. 108 (1650). 



S. fragilis L. Sp. PI. 1017 (1753). 1660. " Salix folio lato 



—Ray C. C. 143. 



S. alba L. Sp. PI. 1021 (1753). 1597. " In divers places of 

 England."— Ger. 1205. But see Turn. Herb. ii. 125, back. 



S. triandra L. Sp. PI. 1016 (1753). 1670. " Salix humilis 

 corticem abjiciens. Near the small brook that runs into the River 

 at Darking in Surrey. Th. Willisell."— Ray, Cat. 272. 



S. purpurea L. Sp. PI. 1017 (1753). 1660. "In the 

 osiar-holts by the river Cams side."— Rav C. C. 146. " Thorpe 

 Meadows near Norwich. Mr. Crowe."— With. Bot. Arr. ed. 3, 45 

 (1796). 



S. viminalis L. Sp. PI. 1021 (1753). 1632. " S. vulg. longis 

 et angustis foliis. Hampstead."— Johns. Enum. 



S. cinerea L. Sp. PI. 1021 (1753). 1804. " Specimens from 

 Cumberland and from Fream Wood are in Mr. Li<ditfoot's her- 

 barium."— Sm. Fl. Brit. hi. 1063. 



S. aurita L. Sp. PI. 1019 (1753). 1724. "Salix folio 

 rotundo minore . . . in sepibus prope Chisselhurst. Dr. Dillenius." 

 —Ray Syn. hi. 450. 



S. Caprea L. Sp. PI. 1020 (1753). 1597. " In divers places 

 of England."— Ger, 1205, 



