PAPAVERACE^. 19 



Order VIH. NYMPHJEACEJE.— 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, 

 fleshy, 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^A. Linn.— White Water-Uly. 



(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 surmunding the ovary. 



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

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



Ponds. Can. to Car. June, July. %. — 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, (iV. 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. White Pond Lily. 



2. NUPHAR. Smith.— YeWow Water-lily. 



(A name applied by Dioscorides.) 

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



1. N. lutea Smith: calyx with 5 sepals; stigma entire, 16—20 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. %. — <Sej9aZs 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. 

 NymphcEa advena Mich. 



In water. Can. to Car. W. to Oregon. June, July. %. — 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. Kalrmana Mich. 



In water. N. S. and Can. July, Aug. %. — Leaves zmd flowers small. Tor 

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



Order IX. PAPAVERACEJE.— Poppyworts. 



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

 pled before expansion, occasionally none. Stamens numerous : 



