206 ELEMENTS OF BOTANY. 



anthers long and connivent about the style ; ovary 2-celled, 

 style slender ; fruit a many-seeded, juicy berry. 



1. S. NIGRUM L. XiGHTSHADE. Aiinual ; stem smooth, or pubes- 

 cent with simple hairs, erect, diffusely branched ; branches wing- 

 angled, 1-3 ft. high ; leaves ovate, irregularly toothed or entire, 

 somewhat inequilateral, petioled ; flowers in lateral, peduncled um- 

 bels, small, white, drooping ; calyx lobes obtuse ; corolla i-i in. 

 wide ; filaments pubescent ; berries globose, smooth, black when ripe. 

 June-September. Common in cultivated fields and waste places; 

 poisonous. 



2. S. Carolinexse L. Horse Nettle. Perennial; stem erect, 

 branched, pubescent with stellate hairs, armed with straight, yellow 

 prickles, 1-3 ft. high ; leaves ovate-oblong, deeply toothed or lobed, 

 acute at the apex, abruptly contracted to the short petiole, prickly 

 on the veins ; racemes lateral, few^-flowered ; pedicels recuj'ved in 

 fruit ; calyx lobes acuminate ; corolla deeply angular-lobed, blue or 

 white ; berry globose, smooth, yellow. May-September. A common 

 weed. 



3. S. ROSTRATUM Duual. Sand Bur. Annual ; the whole plant 

 beset with yellow prickles ; stem erect, diffusely branched, 1-2 ft. 

 high ; leaves broadly oval or ovate in outline, deeply pinnately lobed 

 or parted, petioled, pubescent with stellate hairs ; racemes few-flow- 

 ered ; pedicels erect in fruit ; calyx very prickly, becoming enlarged 

 and enclosing the fruit ; corolla bright yellow, 5-angled, about 1 in. 

 broad. May-September. Introduced from the M^est, and becoming 

 a troublesome weed in some places. 



4. S. TUBEROSUM L. Irish Potato. Annual; stem diffusely 

 branched, pubescent, underground branches numerous and tuber- 

 bearing; leaves irregularly pinnatifid and divided; flowers in cymose 

 clusters, wdiite or purple, with prominent yellow anthers; pedicels 

 jointed ; corolla 5-angled, |-1 in. broad ; fruit a globose, greenish- 

 yellow, many-seeded berry, about | in. in diameter. March-October. 

 Cultivated. 



III. LYCOPERSICON. 



Annual ; stem diffusely branched ; leaves pinnately divided ; 

 flowers in raceme-like clusters on peduncles opposite the 

 leaves ; calyx 5-many-parted, persistent ; corolla rotate, 5-6- 

 parted ; stamens 5-6, inserted in the short tube of the corolla, 

 filaments short, anthers elongated, connivent ; ovary 2-sev- 

 eral-celled, style and stigma simple ; fruit a many-seeded 

 berry. 



