CLASS IX. 
ENNEANDRIA. 
DIGYNIA. 
MERCURIA'LIS. Flowers barren and fertile on distinct 
plants : Cal. with three divisions : Bloss. none. 
R. Siam, nine to twelve: Anthers globular : double. 
F. Caps, two, united : each with one cell and one seed. 
fQuercus.] 
HEXAGYNIA. 
BU'TOMUS. Involucr. simple of three leaves: Bloss. six pe¬ 
tals : Caps, six : Seeds numerous. 
HYDRO'CHARIS- Flowers barren and fertile on distinct 
plants : Cal. three-cleft : Bloss. three petals. 
B. Sheath two-leaved : Filaments, the three inner ones 
bearing a kind of style, or beak. 
F. Caps, six-celled ; many-seeded ; beneath. 
DIGYNIA. 
MERCURIA'LIS* Barren and fertile flowers on different 
plants : Bloss. none: Calyx with three divisions. 
B. Stamens from nine to twelve: Anthers globular, 
double. 
F. Caps, double, two-celled, one seed in each. 
M. peren'nis. Stem undivided : leaves rough: (root creeping. E). 
Curt. —( E.Bot. 1872. E.) — Wale. — Kniph. 1. B. plant. — FI. Dan. 400— Mill. 
* (From the heathen deity, Mercury ; said by Pliny to have been the discoverer of this 
plant; or, rather, perhaps, of its powerful qualities; though possibly the name may 
merely refer to the colour which the herb yields, in heraldry so called. E.) 
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