196 SYSTEMATIC BOTANY. 



i. J. DIPHYLLA (Twin-leaf}. A glabrous herb with fibrous roots. 

 Leaves long, petioled, divided into two leaflets. Flowers white. April- 

 May. 



5. Podophyllum. Sepals 3, caducous. Petals 6-9, obovate. Sta- 

 mens 9-18. Anthers linear. Ovary ovate, thick, sessile, peltate. Fruit 

 a large, ovoid berry, i-celled, and tipped with the stigma. Per. 



i. P. PELTATUM (May-apple). Stem smooth, i foot high, with 2 leaves, 

 and a nodding flower between them ; leaves from 6'-io' in diameter, peltate, 

 often cordate at base, palmately 5~7-lobed ; flower white, i'-2 r in diameter ; 

 petals curiously veined ; fruit ovoid, yellowish, subacid and eatable. May. 



Order IV. NYMPH^EACE^E ( Water-lily Family]. 



Aquatic herbs. Leaves peltate, or cordate, from a rhizoma. 

 Flowers large, often fragrant. Sepals and petals several, imbri- 

 cated in rows, the latter inserted in the fleshy disk. Stamens in 

 several rows, with introrse anthers, and filaments petaloid. Ovary 

 many-celled, many-seeded, crowned by the radiate stigma, inde- 

 hiscent. 



Flowers small. 



Petals 3-4 Brasenia. 



NYMPH,EACE,E. Stamens on ^_ Nympktea . 

 Flowers large. 



Petals many 1 



t Stamens under ovary Nuphar. 



I. Nymphaea. Sepals 4-5. Petals and stamens indefinite, pass- 

 ing into each other. Stigma surrounded by rays. Pericarp many- 

 celled, many-seeded. 



1. N. ODORATA (White Pond-lily). Leaves orbicular, cordate at base, 

 entire, floating, with prominent veins beneath ; sepals 4, equaling the petals, 

 which are lanceolate, white, often tinged with purple ; filaments yellow. 

 July. 



2. Nuphar. Sepals 5-6, somewhat petaloid. Petals numerous, 

 nectariferous on the back, stamens linear, stigma surrounded with 

 rays. 



i. N. ADVENA (Yellow Pond-lily). Leaves oval, smooth, entire, cordate 

 at base, with an open sinus, on long petioles ; flowers large, dull yellow ; 

 sepals 6 ; petals many ; stigma i2-i5-rayed, with a crenate margin. June- 

 July. 



3. Brasenia. Sepals 3-6, colored within, persistent. Petals 3-4. 

 Stamens 18-36. Ovaries 6-18. Carpels oblong, i-2-seeded. 



i. B. PELTATA ( Water-shield}. Stem floating, branched; leaves ellip- 

 tical and peltate, entire, smooth, floating ; flowers just rising above the water, 

 dull purple, i' in diameter. July. 



