95 
Leaf-stalk flattened like a blade of grass, with no real. 
( leaflets at all. 
Nissollia. Grass Pea.” 
\ Leaves with 2 or more leaflets. 
Leaves with 1 pair of leaflets only. 
Stem angular, but without distinct wings; root 
tuberous ; leaflets widish. 
tubero'sus.~ 
Stem with a thin, flat wing down each side. 
Pods hairy ; leaflets 1-2 inches long, with widish~ 
points; the largest petal, or ‘standard,’ 
crimson. hirsu'tus. 
| Pods not hairy; leaflets 3-6 inches long, fine- 
pointed ; standard paler, greenish on its outer 
| surface. sylves'tris. 
~Leaves with 2 or more pairs of leaflets. 
Leaf-stalk ending in a short point, which is not 
twisted or hooked. 
a 
ae es 
+ 
macrorrhi/zus.~ 
Leaves with a hooked or twisted tendril. 
Leaflets very narrow, many times as long as they- 
f are wide: stipules very small and narrow. | 
q palus'tris.” 
Leaves not 4 times as long as they are wide ;~ 
stipules large and broad. | 
, marit‘imus.~ 
LEM'NA. 
Fronds oblong, with a little stalk at one end, usually with~ 
young ones projecting at the sides. 
trisul’ca.- 
Fronds broad-oval or roundish, not stalked. 
ae minute, without any rootlet growing down) 
into the water. arrhi’za. ) 
~Fronds with 1 or more rootlets. 
Fronds ; inch or more across, with several rootlets~ 
to each. 
polyrrhi’za. Greater Duckweed. 
Fronds under } inch, with a single rootlet. 
Fronds almost hemispherical, flat above, thick and~ 
[ spongy below. | 
L | gib’ba.? 
Fronds:not much thickened, usually 2 or 3 cohering 
together by their edges. ) 
minor. Lesser Duckweed? 
COe> 
