806 NOTES ON PONDWEEDS. 
ANTHA Ruiz et Pay. Fl. Peru ; Roem. et 
Eeinlica "Syet Vee. Vil. 1904. Platystachys ian es Psi 
264. — Leaves linear-subulate, rigidly cori en ensely 
lepidote. Peduncle a foot long. Flowers about 7 in simple lax 
spike; flower-bracts oblong-lanceolate, violet. Petals ‘hike, with 
a violet ti tip. peel a -trigonous. 
Ha ru, at Tarma and Huanuco. Not seen. 
a be continued.) 
NOTES ON PONDWEEDS. 
By Atrrep Fryer. 
6. Own Lanp-rorms or Poramoceron. — The hot summer of this 
veers with its deficient rainfall, quite dried up the shallower ditches 
ponds around Chatteris, and also heated the waters of the 
é 0 teal temperature. Hence on the mud of 
the dry ditches there has been an extraordinary growth of land- 
forms of _Potamogetons, as well as an asia t development of 
their coriaceous floating leaves in those stations which remained 
submerged. 
leaves growing at the apex of an a Ae stem ; but sometimes 
§ Stem grows some inches high above the surface of the mud, 
When it is erect, simple, or rarely with one or two short lateral 
branches. It cannot produce flowers, but continues the life of the 
aginst at by producing a stolon terminated by one or more 
Land-forms, as a rule, only produced by those species of 
Potamogeton which are naturally inhabitants of shallow moorland 
yaar , or of situations which are liable to a diminution or total loss 
water during the summer months. It is evident that a species 
iiuatle t to m r 8 
Inhabitants of ay found growing intermixed with the usual 
ve of 
ld in su ch | seat waters, but obtain no permanent 
—y P iL of P which are enabled to resist occasional 
t Sys section exposed to the free air and hot sunshine, all 
cing ceou 
= offer me of hi, section, hitherto but little Seanad. 
valuab een the alliances and specific limits of the 
