NVymphaeaceae 16] 

calyx. as many as the calyx-lobes and opposite them or fewer. Ovary |-celled; styles 2, 
often united. Fruit a utricle. Seed |. 
PENTACAENA THORNY SANDWORT 
Leaves very prickly-pointed; stipules silvery. Sepals hooded, unequal, terminating 
in a short divergent spine, the inner more shortly awned, Style very short, bifid. _ Utricle 
enclosed in the rigid calyx. On sand near the seashore. (Gk. pente—=5, kainis—=a 
knife; referring to the 5 sharp-pointed sepal-spines.) W. 
F. ramosissima, Hook. 
~ NYMPHAEACEAE Water-lily Family 
Herbs, aquatic, perennial; rhizomes horizontal. Leaves large, floating or im- 
mersed, or rarely emersed. Sepals 3—12. Petals 3—many. Stamens 5—many. 
Carpels 3—many, distinct or united or immersed in the receptacle (not ours); stigmas 
distinct or united into a radiate or ring-like disk; ovlues I—many. Fruits indehiscent, 
separate or united. Seed enclosed in a pulpy aril or without it. 

A. Leaves .peltate, on an elongated stem; flowers |—2 cm. wide; carpels distinct; 
pistils 4—18, not dehiscent. ’ BRASENIA (p. 161) 
“AA. Leaves not peltate, all basal; flowers 2.5—-13.7 cm. wide; carpels united into 
a single dehiscent pistil. 
B. Sepals 4, flat; petals 2—3.5 cm. long, white or pinkish, epigynous. 
CASTALIA (p. 161) 
BB. Sepals 8—12, concave; petals |—!.5 cm. long, yellow, hypogynous. 
NYMPHAEA (p. 161) 
BRASENIA WATER-SHIELD 
Covered with gelatinous matter except the upper leaf-surfaces. Stem slender, sev- 
eral feet long, branching. Leaves alternate, oval, entire, 5—10 cm. long, long-petioled, 
centrally peltate, floating, palmately veined. Flowers axillary, purple. Sepals 3. Petals 
3—4, linear. Stamens 12—18; filaments thread-like. Carpels 4—-18, separate. 
Ovules 2—3. Ripe carpels coriaceous, |—-2-seeded. (Origin?) W. E. 
B. schreberi “mel. 
CASTALIA WATEHER-LILY 
Leaves basal, floating, rounded-cordate. Flowers white or pink. Sepals 4. Petals 
many, imbricated in many rows, inserted on the ovary, gradually passing into stamens. 
Stamens many, the outer with large petal-like filaments and short anthers, the inner 
with linear filaments and elongated anthers. Carpels many, united; stigmas linear, 
radiating. Fruit globose, covered with the bases of the petals, ripening under water. 
(Gk. kastalia—a mythical fountain on Mt. Parnassus. ) 
* A. Leaves oval; flowers 7.5—13.7 cm. wide, not fragrant. E. (C. leibergii.) 
C. tetragona, Law. (Small White Water-lily) 
AA. Leaves orbicular; flowers 2.5——5 cm. wide, fragrant. W. 
C. odorata W. & W. (Sweet White Water-lily) 
i © 
NYMPHAEA YELLOW POND-LILY 
= 
\ . 
Rhizome 2—15 cm. thick. Leaves large, basal, floating or emersed, cordate, 
with a deep sinus. Flowers showy, yellow or sometimes purplish. Sepals 5—12, con- 
cave, thick. Petals many, small, stamen-like, hypogynous. Stamens many. Carpeis 
tg Tae 
} 

