Potato Family. 119 



P. pruinosa L. Stem stout, usually erect, hairy, obtusely angled; leaves 

 ovate, cordate, usually oblique at the base, more or less deeply sinuately 

 toothed; fruiting calyx rounded; anthers yellow or tinged with purple. 

 Fields; July-September; reported from Iowa; probably confused with the 

 preceding. 



t t Plants gtabrous; fruiting caly.r not imnken at the base. 



P. cngulata L. Stem erect, 1-3 feet high, glabrous, angular; leaves ovate, 

 with long acuminate teeth, thin, base more or less cuneate; anthers some- 

 what purplish. Fields; July-September; infrequent; Fremont county; forms 

 from Johnson and Taylor counties have been referred to this species. 



P. philadelphica Lam. Annual or perennial; stem 2-5 feet high, angled, 

 branched, glabrous, or slightly pubescent; leaves ovate or ovate-lanceolate, acu- 

 minate, entire or repand-denticulate, usually thin; corolla yellow or yellowish, 

 throat purplish; anthers somewhat purplish; fruiting calyx 10-angled; berry 

 red or purple, filling or bursting the calyx. Fields and waste places; July- 

 September: infrequent; Page and Fremont counties; forms have been re- 

 ferred to this species from Winneshiek, Allamakee, Fayette, Jones, Des 

 Moines, Lee. Story, Calhoun, and Pottawattamie counties. 



* * Perennials by short and thick or running rnotstocks. 

 ■f Pubescence little or none; fruiting calyx scarcely sunken at the base. 



P. longifolia Nutt. Perennial, rootstock thick, stem 1-3 feet high, slight- 

 ly angled, branched, glabrous; leaves lanceolate, oblanceolate, or linear, re- 

 pand or nearly entire; corolla yellow, with a dark center; anthers yellow; 

 fruiting calyx ovoid; berry yellow. Prairies and open woods; July-Septem- 

 ber; infrequent; Allamakee county. (P. Umcenlata var. laevigata Gray.) 



P. lanceolatci Mx. Perennial, stem 4-16 inches high, more or less pubescent 

 with simple or 2-3-forked hairs; leaves spatulate or oblanceolate, usually 

 entire, rarely undulate or angulately toothed; anthers yellow; berry reddish. 

 Fields and prairies; June-September; common. 



f f Pubescence sparce; fruiting calyx deeply sunken, at the base. 



P. virginiana Mill. Rootstock thick, somewhat fleshy; stem 1-3 feet high, 

 erect, branched, angular, somewhat strigose-hairy; leaves ovate-lanceolate, 

 tapering both ways, more or less sinuately-dentate; corolla sulphur-yellow, 

 with purplish spots; anthers yellow; fruiting calyx pyramidal-ovoid, 5- 

 angled, base sunken; berry reddish. Rich soil; June-September: infrequent: 

 Decatur county; reported from other localities but probably confused with 

 the following. 



f f t Pubescence dense, more or less viscid nr glandular. 



P. heterophylla Nees. Rootstock slender, creeping; stem 1-3 feet high, 

 erect, at length decumbent and spreading, villous, viscid and glandular; 

 leaves broadly cordate, acute, sinuately toothed or nearly entire; corolla 

 greenish yellow, with a brownish or purplish center; anthers usually yellow: 

 berry yellow Rich soil; July-September: common. (P. virginviiia Mill, of Gray's 

 Manual but not of Miller). This is a very variable species and the following vari - 

 eties have been recognized as belonging to our flora. The variety ambigua 

 (Gray) Rydberg, upright, long-villous, scarcely viscid; flowers larger than those 

 of the type; anthers purplish. The variety nvctaginea (Dunal) Rydberg. leaves 

 dark green, firm, acuminate, nearly subentire. pubescent mainly on the veins 

 beneath. 



NICANDRA Adans. An erect glabrous annual, with alternate petioled 

 thin sinuate-dentate or lobed leaves, and solitary axillary nodding flowers. 



