^ ^ Per. double, hypogynous (inner, at least, 
coloured). Carp + free. 
Family 5. ALISMATACE^. Marsh herbs. Lea. 
chiefly radical (some submerged or floating). Inflor. 
usually much branched. Flow, mostly ^ , or i- 
sexual. Outer whorl of per. 3, sepaloid ; inner 3, 
petaloid. Sta. 6 — oo- Carp. 6—00, free, each with 
I basal anatropous ovule (or in Damasonium more). 
Fr. of achenes or follicles. Seeds exendospermous. 
Alisma (inch Elisma and Echinodorus), 
Damasonium, Sagittaria. 
Family 6. BUTOMACE^E.* Marsh herbs, with 
conspicuous flow. Inflor. usually a cymose umbel. 
Flow. ^ , 3-merous (sep. and pet. similar and 
petaloid in the Brit. sp.). Sta. 9 — 00 (9 in Brit. sp.). 
Carp. 6 — 00, often united at the base (6 in Brit, 
sp.) ; ovules 00, anatropous, scattered over the inner 
surface of the ovary. Fr. of follicles. Seeds exen- 
dospermous. Butomus. 
^ ^ ^ Per. double, epigynous. Carp, united. 
Family 7. HYDROCHARITACE.E. Aquatic 
herbs. Lea. submerged, floating or emergent. Flow, 
solitary or cymose, at first enclosed in bracts, 
usually i-sexual, 3-merous (outer sepaloid, inner 
petaloid). Sta. 3 or more, in whorls of 3^s. Carp. 
(2 — 15) ; ovary usually i-celled ; ovules 00, ortho- 
tropous to anatropous, arranged on projecting 
parietal plac. Fr. irregularly dehiscent or somewhat 
succulent. Seeds exendospermous. 
Stratiotes, Hydrocharis, [Elodea, Vallisneria.'] 
* This family might better be included as a subfamily of 
Alismataceae, as in Hooker’s Student’s Flora. It differs 
almost solely in its placentation. 
5 
