TETRANDRIA DIGYNIA TETRAGYNIA 19 
is no flower, but four ered, fubulated, very fmall fila- 
ments, placed on the mouth of the cup, with roundifh 
antheraj. There are tv/o oval germina with flryles like 
thread, of the length of the ilamina, and placed at the 
bafe of the germen. The lligmata are headed. The cup 
contains in the bottom two oval, acuminated, compref- 
fed feeds of the length of the ftyle. 
Obf. Linn. This plant approaches near to the La^ 
dfs Mantle. 
We have but one fpecies of this plant. In dry paf- 
tures and on rocky mountains. An. May — Aug. Ou 
7 'ealand common plentifully. 
B U F O N I A. Bastard Chickweed. 
The cup is'tetraphyllous, eredt and endures till the 
fruit be ripe, the leaves are fubulated and carinated with 
membranaceous margins. There are four flower petals, 
oval, emarginated, eredt, equal, and fliorter than the cup. 
The four filaments are equal and the length of the ger- 
men, with didymous antherae. The germen is oval, com- 
prefled with two ftyles the length of the ftarnina. 
The fruit is an oval, comprefied, unilocular capfule with 
two valves, containing two oval comprefied feeds, that 
are convex on one fide. 
•We have but one fpecies of this plant. On the fea 
fhore. On Hounjlow -heath. R. Sy. May. 
T ET R A G T N I A comprehends fuch as have four piftils. 
POTAMOGETON. Pondweed. 
There are four roundifh, obtufe, concave, eredt, un- 
guiculated, deciduous petals without any cup. The four 
filaments are plain, obtufe and fmall with didymous and 
ibort antherae. There are four ovally-pointed germina 
and obtufe ftigmata. There is no feed vefiel, but the 
feeds are four in number, roundifh and acuminated, gib- 
bous on one fide, and comprelfed and angulated on the 
other. 
D 2 
Natans. 
