192 nymph^acejE. 



1-celled, with a single ovule. Fruit indehisoent, beaked by the 

 slender persistent style, spinose or tuberculate at base. Embryo with 

 highly developed plumule. No endosperm. 



1. CERATOPHYLLUM L. 



The only genus. (Name from the Greek, keras, a horn, and 

 phyllon, a leaf, the leaves cut into slender rigid divisions. ) 



1. C. demersum L. Hoknwort. Stems slender, J to 2 ft. longf 

 leaves in whorls of 6 to 8, the segments prickly-dentate, J to 1 in. 

 long; style as long as the achene; this 1 to 2 lines long, with a 

 spine or reilexed horn on each side near the base. 



Ponds and lakes: Santa Cruz, San Francisco, and northward. 

 Aug. Seldom collected in fruit; achene variable, the margin winged 

 or wingless and the sides sometimes crested or covered with tubercles. 



33. NYMPH>EACE>E. Water-lily Family. 



Aquatic perennial herbs with horizontal rootstocks or with tubers. 

 Leaves floating or erect, peltate or deeply cordate. Flowers large, 

 solitary, perfect, on long peduncles. Sepals 3 to 12. Petals 3 to 

 many. Stamens 6 to numerous, hypogynous. Carpels 3 to many, 

 united into a single pistil with many cells, or distinct. 



To this order belong the Water Lilies, the Pond Lilies, the Water 

 Chinquapin of the Eastern United States, and the Sacred Indian 

 Lotus. Besides two species of Pond Lilies we have in California the 

 Water-shield, Brasenia peltata, which has tuberous rootstocks, pel- 

 tate leaves, flowers J in. long, and distinct pistils; it has been found 

 near Stockton (fide G-reene) and Clear Lake (Jepson). 



1. NUPHAR Sibth. & Smith. Pond Lily. 

 Aquatic or subterrestial plants. Scapes from creeping rootstocks 

 rooting from beneath and bearing on the upper side the scars of 

 former petioles. Leaves in ours cordate with rounded lobes and 

 narrow or closed sinus; petioles long. Sepals 5 to 12, conspicuous, 

 orbicular, concave, mostly petal-like, unless at base or on the outside. 

 Petals 10 to 20, small and thick, bearing more or less resemblance to 

 staminodia. Stamens hypogynous, numerous, densely imbricated 

 ' around the ovary, at length recurving; anthers linear; filaments very 

 short. Ovary 10 to 25-celled, the stigmas radiating upon its truncate 

 or disk-like summit. Fruit coriaceous-baccate. (Name thought to be 

 from the Arabic.) 



Sepals 6 to 7; anthers yellow; stigmatic rays 13 to 22 . . 1. N. advena. 



Sepals 5 to 12; anthers dark red; stigmatic rays 15 to 24 . . . 2. N. polysepaZum. 



1. N. advena Soland. Yellow Pond Lily. Kootstock horizon- 

 tal, creeping; leaves 6 to 9^ in. broad, 9 to 13 in. long, floating or 

 raised above the water on stout subterete petioles; calyx If- (when 

 fully expanded, 2 to 3) in. in diameter; sepals 6 or 7, the inner 

 narrowed at base, yellow, the three outer smaller and greenish; petals 



