107. Solan ACEAE 195 



ground and along roads, common. June-Sept 



P. heterophylla Nees 



9. Plants annual; anthers purple, 1-2 mm long. 



11. Stems slender, spreading, diffusely branched, sharply angled; 

 leaves thin, undulate or entire; corolla 10-12 mm in diam- 

 eter; anthers 1.5-2 mm long; fields, waste places, road- 

 sides, local. June-Oct P. pubescens L. 



11. Stem stout, erect, obtusely angled; leaves thick, cordate, 

 sinuate-dentate to the base; corolla 4-8 mm in diameter; 

 anthers 1-1.5 mm long; alluvial soil, fields, roadsides, 



waste ground, chiefly in western 111. July-Sept 



P. pruinosa L. 



4. Solanum L. — Nightshade 



1. Plants more or less prickly; pubescence of stellate hairs. 



2. Leaves toothed or entire; flowers lavender, purple, or white; 

 berry not enclosed in the calyx ; plants perennial. 

 3. Leaves green, coarsely dentate; the pubescence hirsute; berry 

 1.5-2 cm in diameter; fields, roadsides, waste places, or in 



open woods, common. June-Sept. Horse-nettle 



S. carolinense L. 



3. Leaves silveiy stellate-canescent, elliptic-lanceolate, repand- 

 dentate to entire; berry 8-12 mm in diameter; roadsides, 

 railroads, and waste places, occasionally adv. from the 

 Great Plains; Adams Co., R. Brinker in 1944. May-Sept. 



Silver-leaved Nightshade S. elaeagnifolium Cav 



2. Leaves irregularly pinnately obtusely 5- to 7-lobed; flowers 

 yellow, 2-2.5 cm in diameter; beri"y enclosed by the prickly 

 calyx; plants annual; cultivated ground and roadsides, com- 

 mon; native of the Great Plains; adv. in 111. Buffalo-bur 



[Androcera rostrata (Dunal) Rydb.] S. rostratinn Dunal 



1. Plants not prickly or steUate-pubescent. 



4. Plants perennial, climbing or twining; flowers purple, or some- 

 times white; berries scarlet, poisonous; moist ground, com- 

 mon; nat. from Eur. June-Oct. Deadly Nightshade 



- S. dulcamara L. 



4. Plants annual, erect or spreading; flowers white. 



5. Leaves pinnatifid; berries 1-1.5 cm in diameter, green when 

 ripe; an occasional weed in cultivated ground or waste 

 places; Cook Co., Moffatt; Carroll Co., Clinton. June- 

 Sept S. triflorum Nutt. 



5. Leaves entire or sinuate; berries 5-8 mm in diameter, black 

 when ripe: roadsides, river banks, and cultivated ground; 

 nat. from Eur. June-Oct. Black Nightshade .S". nigrum L. 



5. Lycopersicum Hill 

 L. esculentum Mill. Tomato. Occasionally escaped from cult., 

 but not persistent; native of S.Am. July-Oct. 



