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Family 1. NYMPHAACEZ. 
Sepals and petals inserted into a fleshy, cup- 
shaped thalamus. Stamens o, oo-seriate, in- 
serted with the petals; filaments flat, petaloid, 
anthers introrse, adnate. Carpidia several, 
immersed in the thalamus, and presenting the 
appearance of a oo-celled ovary; ovules o, 
inserted on the partitions; styles united and 
forming a radiate, peltate stigma, projecting 
beyond the thalamus and persistent. 
1, Nuphar Smith. Warer-Lity. 
Sepals more than 4, petaloid. Petals o, 
short, densely crowded round the thalamus. 
Stigma stipitate. Fruit a baccate pseudocarp. 
2. Aquatic. Flowers yellow. 
1. N. potysepaLum Engelm. Sepals more 
than 7.—Near the Marine Hospital. Taylor- 
ville, Paper-mill Creek. Summer. 
Series 3. PERIGYNA. Thalamus cup- 
shaped, bearing sepals, petals and stamens, 
and receiving the carpidia in shape of a recep- 
tacle, which in many instances surrounds the 
carpidia enough to form an inferior ovary. 
Section 1. CatycirLorm. Petals present and 
distinct, 4 or 5. Stamens 4 or 5, or their mul- 
tiples. 
Orper 1. MYRTALES. Calyx lobes val- 
vate in estivation. Petals as many, or a mul- 
