POTATO FAMILY 205- 



Pubescence very short; leaves narrowly oblanceolate. 



5. P. polyphyiia. 

 Pubescence long; leaves spatulate. 6. P. lanceolata. 



Leaves broader, often rhombic; hairs on the lower surface branched 



7. P. pumila. 

 Fruiting calyx pyramidal-ovoid, obtusely 5-angled and deeply sunken at 



the base; leaves ovate to lanceolate, generally more or less toothed. 



8. P. virginiana. 

 Pubescence dense, viscid, partly of fine and short, partly of long flat, jointed 



hairs. 

 Leaves large; blades over 5 cm. long, more or less cordate; long flat hairs 

 numerous. 9. P. heterophylla. 



Leaves smaJer; blades less than 5 cm. long; long flat hairs few, mostly 

 confined to the calyx. 

 Plant erect or ascending. 



Leaf-blades reniform or rounded-cordate, coarseb -sinuately toothed. 



10. P. hedcracfolia. 

 Leaf-blades rounded-ovate or rhombic. 11. P. comata. 



Plant prostrate, diffuse; leaf-blades nearly orbicular. 12. P. rotundata. 

 Pubescence fine, grayish, at least in part stellate. 13. P. Fendleri. 



2. QUINCULA Raf. l. Q. lobata. 



3. CHAMAESARACHA A. Gray. 



Pubescence dense, liirsute as well as puberulent. 1. C. conioides. 



Pubescence sparse, puberulent or stellate, hirsute if at all only on the caljx. 



2. C. Coronopus^ 



4. ANDROSERA Nutt. Buffalo Bur. i. A. rostrata. 



5. SOLANUM (Toiirn.) L. Nightshade, Bittersweet, Potato, Horse 



Nettle. 



Annuals. 



Leaves pinnatifid. 1. S. Iriflorum. 



Leaves sinuately dentate or entire. 



Plant strigose or glabrous; berry black. 



Leaves glabrous or nearly so; sepals very obtuse. 2. S. nigrum. 



Leaves decidedly strigose beneath; sepals abruptly acutish. 



Corolla-lobes 3-4 mm. long. 3. S. interius. 



Corolla-lobes 6-8 mm. long. 4. S. Douglasii. 



Plant more or less viscid- villous ; berry greenish or yellowish. 5. S. villosum. 

 Perennials. 



Plant green, glabrous or pubescent, but not stellate, never prickly. 



Low plants with tuber-bearing rootstocks; leaves pinnately divided into .5-7 divi- 

 sions. 6. iS. Jamesii. 

 Tall plants, more or less woody below, not tuberiferous; leaves simple or pinnately 

 3-lobed. 

 Plant climbing; berry ellipsoid. 7. S. Dulcamara. 

 Plant not climbing; berry giobose. 4. S. Douglasii. 

 Plant with stellate hairs; stem often prickly. 



Leaves silvery-white, oblong to Imear. 8. S. elaeagnifolium. 



Leaves green, ovate, sinuately toothed. 9. S. carolinehse. 



6. LYCOPERSICON Mill. Tomato, Love Apple. l. L. Lycopersicum. 



7. LYCIUM L. AL\TRiMONY Vine. 



Fruit red, globose; corolla narrowly funnelform, yellow or greenish. 



Flowers 2 cm. long. 1. L. pallidum. 



Flowers about 1 cm. long. 



Leaves and calyces puberulent, the latter about half as long as the corollas. 



2. L. Cooperi. 

 Leaves and calyces glabrous (except the margin), the latter less than one-third 

 as long as the corollas. 

 Calyx nearly one-third as long as the coroda, its lobes lanceolate or ovate- 

 lanceolate; leaves 1-4 cm. long. 3. L. Torreyi. 

 Calyx less than one-fourth as long as the corolla, its lobes broadly triangular;, 

 leaves usually less than 1 cm. long. 4. L. Andersonii. 

 Fruit orange-red, oval; corolla short-funnelform, greenish purple. 5. L. vulgare. 



8. HYOSCYAMUS (Tourn.) L. Henbane. l. H. niger. 



9. DATURA L. Thorn Apple, Jimson Weed, Jamestown Weed, 



Stramonium. 



Corolla 1.5-2 dm. long; capsule more or less fleshy, bui'sting irregularly. 



1. D. melcloides. 

 Corolla about 1 dm. long; capsule dry, 4-valved. 

 Capsule erect; plant glabrous. 



Corolla white; lower prickles of the capsule shorter. 2. D. Stramonium. 



