12 
c Upper leaves stalked, floating flat upon the surface of the 
water. 
Leaves oblong, much longer than wide. 
| Leaves with a single mid-rib running up the centre ;~ 
f flowers pink, 5-lobed. 4 
Polyg’onum. Zs 
\Leaves with 3 or more longitudinal nerves. 
Leaves scarcely 1 inch long; flowers with 3 ea 7 
f petals. J ae 
Alis’ma na/tans. 
\Leaves usually longer; flowers greenish, with 44 
segments. J 
| Potamoge'ton. Pondweed. S 
Leaves more or less roundish-oval or triangular. 
ao with the stalk attached in the centre of the~ 
leaf. 
| Hydrocot’yle vulgaris. MZarsh ete hae, 
Leaf-stalk not attached in the centre. 
Leaves kidney-shaped, the nerves all —- 
f towards the tip; petals 3. J RQ 
L Hydroch’aris Mor'sus-ra‘ne. Frogiit. 
Nerves not so arranged. 
peers in one piece, 5-lobed; leaves ooo 
| brownish dots beneath. J 
| Limnan'themum nympheoi'des. 
~Petals separate ; leaves not dotted. 
es small, angular or toothed or lobed >) 
| petals 5, white. J 
L Ranunculus. 
Leaves large, entire; petals numerous. 
og 4, white within, scarcely longer than 
the white petals, which are arranged in | 
several ranks. J 
Nymphea al’'ba. Water-lily. 
Sepals 5 or 6, yellow within; much longer 
than the small, yellow petals which lie | , 
in a ring within them. 
( Nu'phar lu'teum. Yellow Water-/ily. 
Leaves not floating (or, if so, without stalks). 
Leaves thin, translucent, with 3 or more parallel ith 
running length-ways; flowers greenish, with 4 
segments. Bae 
Potamoge'ton. Pondweed. & 
Leaves with only one longitudinal nerve, or thick and 
opaque, and apparently without any nerve. 
