815 
Cambridge  plant  seems  to  have  free  floating  stems  and 
is,  I  think,  our  usual  palustris ,  which  I  take  to  be  Z. 
brachystemon  Gay,  and  repens  can  only  be  a  variety  or 
even  state  of  this.  The  fruits  on  my  example  are  few 
and  not  in  a  good  condition  for  determining  species.  I 
have  not  discovered  the  var.  repens  of  Koch— C.E.S.  I 
do  not  understand  this  variety ;  the  present  plant  seems 
to  me  merely  a  creeping  state  of  our  usual  form,  probably 
due  to  its  growing  in  shallow  water.  Koch’s  account 
(“  Synopsis,”  ed.  2,  p.  782)  does  not  indicate  clearly  that 
he  meant  to  separate  Z.  repens  Boenn.  from  Z.  major 
Boenn.,  which  he  apparently  treated  as  synonymous  with 
Z.  palustris  L — E.S.M.  I  should  not  name  this  repens _ 
A.B. 
Z.  palustris  L.,  var.  radicans  Asch.  and  Graebn. 
Muddy  edge  of  pond  near  Cambridge,  v.c.  29,  Oct.  29, 
1910 — A.  J.  Wilmott.  I  have  not  seen  the  description  in 
Asch.  and  Graebn.  “Synopsis.”  This  plant  differs  from 
the  one  named  var.  repens  Koch  by  Mr.  Wilmott  in  its 
long-stalked  fruit  and  its  much  longer  styles _ E.S.M.  I 
do  not  know  Wallman’s  Z.  radicans  (“  Bot.  Not.”  1840, 
p.  44),  but  Asch.  and  Graebn.  give  for  it  “  Laubstengel 
und  Blatter  meist  fein,  fadenformig,”  (“  Mitteleur.  FI.” 
I.,  p.  364,  1897) — A.B.  This  is  an  interesting  plant  and 
deserves  study.  In  the  specimen  before  me  it  is  difficult 
to  see  if  the  stem  is  really  rooting  or  whether  the  plants 
are  small  owing  to  the  shallow  water  of  the  pond.  Mr. 
Wilmott  could  doubtless  give  the  information."  In  any 
case,  the  plant  comes  under  the  “  pedicellata  ”  group,  and 
if  it  is  creeping  would  seem  to  fit  very  well  Ascherson  and 
Graebner’s  description  of  var.  radicans.  Whether  this  is 
the  same  as  "Wall  mail  s  Z.  radicans  I  do  not  know.  If 
the  plant  is  floating,  and  not  creeping,  then  it  would  be 
apparently  var.  pedunculata  A.  and  G.  ( =  Z.  pedunculata , 
var.  maritima  Rchb.  FI.  Germ,  excurs.  I.  7  (1880)). 
The  Z.  repens  of  Koch  and  Boenn.  comes  under  the 
“ genuina  ”  group  of  Zannichellia  (as  arranged  by  Aschers. 
and  Graeb.),  which  is  distinguished  by  an  almost  sessile 
fruit  with  a  much  shorter  style _ C.E.S. 
Mr.  Wilmott  states  that  the  plant  was  growing  in 
shallow  water  and  rooting. 
