(939 ) 
ple, rarely a divisor. Carpidia united into a 
single ovary. 
Family 1. HALORRHAGIDEZ, 
Calyx tube adnate to the ovary; limb 4-parted. 
Petals, if present, alternate with calyx lobes. 
Stamens not more than twice as many as petals; 
if of equal number opposite to them. Pla- 
centze central, l-ovulate. Styles as many 
as cells. 
1. Hippuris L. Mare’s Tal, 
Flowers 3%, or sometimes polygamous, mo- 
nandrous; filament subulate. Ovary 1-celled, 
1-ovulate, style filiform. Fruit a caryopsis.— 2. 
Aquatic. Leaves verticillate; flowers minute, 
solitary in the axils. 
1. H.vuntearis L.—Marine Hospital (at pres- 
ent extinct). Summer. 
2, Myriophyllum L. Warer-mitroit. 
Moneecious. 3: petals caducous; stamens 8. 
2: calyx limb and petals minute; stigma vil- 
lous; ovary 4-celled, 4-ovulate. 
1. M. sproatum L.—Marine Hospital. 
Camp Taylor. Summer. 
Family 2. ONAGRACEAE. 
Calyx tube adnate to the ovary. Petals al- 
ternate with them, not valvate in sstivation. 
Stamens inserted with petals, as many or a 
