126 American Midland Naturalist Monograph No. 2 



8. Calyx subcylindrical; plants not glaucous; flowers few, usually solitary; 



woods, not common. June-July. [5. alba Muhl.} 



S. nivea (Nutt.) Otth. 



1. Leaves mostly in whorls of four, acuminate; petals white, 1.5-2 cm. long; 

 calyx campanulate, 1-1.5 cm. long; woods, common. June-Aug. [5. stel- 

 lata var. scabrella Palmer & Steyerm.} S. stellata (L.) Ait. 



7. Lychnis L. — Campion 



{Melandrium Roehl) 

 1. Flowers white or pink, fragrant, opening in the evening; similar in appear- 

 ance to Silene noctiflora, but plants dioecious or monoecious, calyx-teeth 

 triangular, 3-5 mm. long, styles 5, and the capsules with 5 bifid teeth; 



fields and roadsides; nat. from Eur. May-Aug. Evening Campion 



L. alba Mill. 



1. Flowers red, inodorous, opening in the morning; waste places, occasional; 

 adv. from Eur. June-Aug. Red Campion L. dioica L. 



8. Saponaria L. 



{Vaccaria Medic.) 

 1. Calyx terete; flowers 2-3 cm. in diameter (sometimes double), in dense 

 corymbiform cymes; plants perennial; roadsides, common, adv. from Eur. 

 June-Sept. Bouncing Bet S. officinalis L. 



1. Calyx sharply 5-angled; flowers 6-8 mm. in diameter, few, in a loose cyme; 

 plants annual; roadsides and fields, adv. from Eur. June-Aug. [Vaccaria 

 vulgaris Host} Cow-herb S. vaccaria L. 



59. Elatinaceae Lindl. — Waterwort Family 

 1. Elatine L. — Waterwort 

 E. brachysperma Gray. Shallow water, rare. Springfield, Bebb.; Athens, 

 Hall. 



60. Magnoliaceae J. St. Hil. — Magnolia Family 



1. Leaves entire, acute or acuminate; buds pubescent; fruit a follicle \. Magnolia 



1 . Leaves with a truncate apex and two broad lateral lobes; buds glabrous; fruit a 

 samara 2. LirioJendron 



1. Magnolia L. 



M. acuminata L. Cucumber Tree. Woods, s. 111., as far north as Union, 

 Johnson, and Pope counties. May. 



2. Liriodendron L. — Tulip Tree 

 L. tulipifera L. Woods, local; s. 111., extending northw. to St. Clair and 

 Crawford counties. Apr.-June. 



61. Annonaceae DC. — Custard-apple Family 

 1. AsiMiNA Adans. 



A. triloba (L.) Dunal. Pawpaw. Woods, nearly throughout 111., extending 

 northw. to Cook and Lee counties. Apr.-May. 



