1'APAVERACE.E. 19 



ORDER VIII. NYMPH^EACE^E. WATER-LILIES. 



Sepals and petals numerous, imbricated, passing gradually 

 into each other. Stamens numerous, inserted above the petals 

 into the disk ; filaments petaloid ; anthers adnate. Disk large, 

 flesh)', surrounding the ovary more or less. Ovary with radi- 

 ating , stigmas. Fruit many-celled, indehiscent. Seeds very 

 numerous. Herbs with peltate or cordate fleshy leaves, arising 

 from a prostrate trunk, growing in quiet waters. 



1. NYMH^EA. Linn. White Water-lily. 

 (From its imbibing the water, as the Nymphs were supposed to do.) 



Sepals 4, at the base of the disk. Petals and stamens inserted 

 into the fleshy disk surrounding the ovary. 



N. odorata Ait. : leaves, floating, orbicular-cordate, very entire ; nerves 

 and veins prominent ; stigma 16 20 rayed ; rays incurved. 



Ponds. Can. to Car. June, July. 1|-. There are two varieties of this plant. 

 One has the sinus and lobes of the leaves more or less acute ; the flowers 

 white (N. alba. Mich.} The other is smaller, has purplish leaves and peduncles, 

 and rose-colored flowers, (N. minor D. C.) Both have the leaves on very long 

 petioles, coriaceous, and lying on the surface of the water. Flowers 3 4 inches 

 in diameter, very odorous. While Pond Lily. 



2. NUPHAR. Smith. Yellow Water-lily. 



(A name applied by Dioscorides.; 

 Sepals, petals, and stamens, inserted at the base of the disk. 



1. N. luted Smith: calyx with 5 sepals; stigma entire, 1620 rayed, 

 deeply umbilicate ; leaves cordate, oval, lobes approximate ; petioles 3-sided, 

 acute- angled. Nymphcea lutea Linn. 



In water. N. S. and N. to lat. 64. June. %. Sepals very obtuse. Pe- 

 tals much smaller, truncate. Confounded by some of our botanists with the 

 next species, from which it is quite distinct. 



Small-flowered Yellow Water-lily. 



2. N. advena Ait. : calyx 6-sepalled ; petals numerous, small ; leaves 

 cordate, with divaricate lobes ; petioles semicylindrical ; fruit sulcate. 

 NymphcBa advena Mich. 



In water. Can. to Car. W. to Oregon. June, July. 7|-. Leaves upright 

 or floating. Flowers large, yellow. Common Yellow Water-lily. 



3. N. Kalmiana Ait. : calyx 5-leaved ; stigmas incised, 8 12-rayed ; 

 leaves cordate, submersed, with approximate lobes ; petioles terete. 

 Nymphcea lutea var. Kalmiana Mich. 



In water. N. S. and Can. July, Aug. Tj.. Leaves and flowers small. Tor 

 ?ey considers it a variety of N. lutea. Kalm's Water-lily. 



ORDER IX. PAP AVERAGES. POPPYWORTS. 

 Sepals 2, rarely 3, deciduous. Petals 4 or 6, usually crum- 

 pled before expansion, occasionally none. Stamens numerous ; 



