58 American Midland Naturalist Monograph No. 7 



3. Sepals thin, 3-4.5 cm long, with wide undulate or crisped 

 margins; fruiting styles pubescent but not plumose; wet 

 woods, not common; known from Alexander, Pulaski, and 



St. Clair counties C. crispa L. 



1. Flowers panicled; sepals white, thin, spreading. 



4. Leaflets usually 3, thin, toothed or lobed; sepals 9-11 mm long; 

 moist ground, locally nearly throughout 111. July-Aug. 

 Virgin's Bower C. virginiana L. 



4. Leaflets 5, entire, coriaceous; sepals 10-17 mm long; roadsides 

 and borders of woods, occasional ; known from Crawford, 

 Jackson, and Peoria counties; native of e. Asia. Aug.-Oct. 

 - C. dioscoreifolia Levi. & Van. 



4. Cabombaceae A.Gray — Watershield Family 



1. Leaves all peltate, entire, floating; stamens 12-18; carpels 4-18 1. Brasenia 



1. Submersed leaves dissected; stamens 6; carpels 2-3 2. Cabomba 



1. Brasenia Schreb. — Watershield 



B. schreberi Gmel. Ponds and slow streams, rare. June- July. 



2. Cabomba Aubl. 



C. caroliniana A.Gray. Carolina Watershield. Ponds, rare; s. 111.; 

 Mt. Carmel, Wabash Co., Oct. 12, 1876, Schneck 40; LaRue Swamp, 

 Union Co. May-Sept. 



5. Nymphaeaceae DC. — Waterlily Family 



[.Leaves oval; flowers yellow; sepals 5-7; petals 10-20, small filament-like 



1. Nuphar 



1. Leaves orbicular; flowers white; sepals 4; petals numerous 2. Nymphaea 



1. Nuphar Sm. 



1. Petioles round in cross-section; ponds and slow streams, occasional. 



June-Aug. Yellow Pond-lily A'^. advena Ait. 



1. Petioles flattened; ponds, rare; n. 111., Cook and Lake counties. 



June-Aug. Variegated Pond-lily A^. variegatum Engelm. 



2. Nymphaea L. — Waterlily 

 1. Flower not fragrant, 10-25 cm in diameter; petals spatulate; 

 rhizome with numerous self-detaching tubers; seeds 3-4.5 mm 

 long, globose-ovoid; ponds and slow streams, rare. June-Aug. 



White Waterlily A^. tuberosa Paine 



1. Flower very fi^agrant, 6-12 cm in diameter; petals elliptical; rhi- 

 zome without tubers; seeds 1.5-2.5 mm long, ellipsoid; lakes and 



shallow ponds, rare. June-Sept. Fragrant Waterlily 



A'^. odor at a Ait. 



