20 DICOTYLEDONOUS PLANTS. 



Flowers yellowish-white and larger than that produced by any 

 other plant in North America, except Magnolia macrophylla. 



Water Ckmquepin* 



2. NYMPH^EA. Linn. 



Sepals at the base of the disk. Petals and stamens con- 

 nected with the whole of the disk, which covers the carpels. 



Polyandria. Monogynia. 



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

 nerves and veins prominent ; calyx 4-leaved, equal to the petals ; stig- 

 ma 16 20 rayed ; rays erect, inflexed at the apex. N. alba Watt. 

 Mich. 



HAB. Ponds. Can. to Car. June, July. 2_. Leaves on very 

 long petioles. Flowers large, white, odorous. N. minor of De 

 Candolle is probably only a variety of this species. Pond Lily. 



3. NUPHAR. Smith. 



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



Polyandria. Monogynia. 



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. Nymphcta lutca Linn. 



HAB. In water. N. S. and N. to lat. 64. June. U- Sepals 

 very obtuse. Petals much smaller, truncate. Confounded by 

 some of our botanists with the next species, from which it is 

 quite distinct. 



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

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

 "Nymphout advena Mich. 



HAB. In water. Can. to Car. June, July, 1(. Leaves up- 

 right or floating. Flowers large, yellow. Yellow Water Lily. 



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

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

 Nymphaa lutea, var. kalmiana Mich. 



HAB. In water. N. S. and Can. July, Aug. 1. Leaves and 

 flowers small. Kalrns Water Lily. 



ORDER IX. TAPAVERACEjE. De Cand. Lind. 



Sepals 2, deciduous. Petals hypogynous, either 4, or 

 some multiple of that number placed in a cruciate manner. 

 Stamens either 8, or some multiple of 4, generally very nume- 

 rous. Ovary 1. Style short or none. Stigmas 2 or many. 

 Fruit 1-celled, either pod-shaped, -with 2 parietal placentae, or 

 capsular, with several placentae. Seeds numerous. Embryo 

 minute, in the base of a fleshy albumen. 



