470 TETRANDRIA. TETRAGYNIA. 
POTAMOGE’TON. Tourn. 103. Gaertn, 84. 
CAL. none, Ss 
Boss, Petals 4, nearly circular, blunt, concave, upright, 
furnished with a little claw, deciduous. © ) 
Sram. Filaments 4, flat, blunt, very short. .Anthers dou- 
ble, short. “ae 
Pisr. Germens 4, egg-shaped, but tapering to a point, 
Style none. ‘Summits blunt. = : 
S. Vess. none. . i 
SEEDS 4, roundish, ‘taper pointed, bulging on one side, 
flatted on the other, and angular, 
» RUPPIA. Gertn. 84... ae 
Ca. Sheath, hardly any but what is formed by the base 
; of the leaves. Sheat a Fruit-stalk awl-shaped, undi- 
vided, ‘straight, bending when the fruit ripens, beset 
_ with flowers which point in 2 opposite directions. . 
Cup none, ? ee 2 
Boss. none, fe 
Stam. Filaments none. Anthers 4, sitting, equal, some- 
nS wie: rently rather double. h 
IST. ens 4 or 5, somewhat ego-sha approach- 
ing. Style none. Summits ri = ee 
S. Vess. none. The seeds aré supported upon little foot- 
stalks, thread-shaped, and as long as the fruit, 
SEEDS 4 or 5, egg-shaped, oblique, terminated by a flat 
circular summit, a ee ‘hed 
SAGI’NA, Cyrt. iii. 27. F136, & 291, 
Cat. Cup 4-leaved, Leafits exo-shaped. concave greatly 
expendi: eel - Pedy : ee i ee 
LOSS, SES cereres. 75: 2 i xp i % shorter 
Stam. Filaments 4, hair-like. Anthers roundish. . tag 
Pist. Germen somewhat globular. Styles 4, awl-sha 
jee bent backwards, downy. Summits simple. a. Sui 
S..VEss. Capsule egg-shaped, straight, with 4 cells and 
SEEDS numerous, very small, fixed to the receptacle. - Lie 
S — Sagina procumbens has flowers with or without petals. 
. as @ has no petals; and in S. erecta the cup leatits ate 
Spear-shaped, tapering to a point. (Reich.) The S, apetalats 
not destitute of petals, but they are very minute. Sty a 
