PBNTANDRIA. MOKOGYNIA. 151 



18. JVuttalU. Pursh. Perennial. Stem simple, erect and 

 leafy, 4 to 6 inches high. Leaves lanceolate-ovate, entire, 

 atienualed down the petiole, opaque, margin and nerves 

 minutely pubescent, leaf and petiole 3 to 4 inches long, 

 scarcely half an inch wide. Stipules long, linear lanceo- 

 late, entire. Flowers small, yellow, petals purplish on the 

 >mJer side. Segments of the calix linear lanceolate, acute. 

 Stigma capitate, erostrate, nearly smooth. Flowering in 

 May. Near the confluence of Rock river and the Mis- 

 souri, and from thence to the mountains. This is the 

 only species of Viola on the plains of the Missouri, from 

 the confluence of the river Platte to Fort Mandan. 



19. bicolor? Hoffman. Flor. German. 2. p. 170. Pursh. 

 1. p. 175. V' arvensis. Elliott, p. 302. Annual. Stem 

 simple, erect, acutely triquetrous. Radical leaves spa- 

 thidate-oval, with a few denticulations, upper leaves 

 spathulate-lanceolate, or ovate, smooHi. Stipules large, 

 cristate-palmate, ciliate, deeply 7 to 9 lobed, segments 

 linear -oblong, terminal one much larger. Peduncle long, 

 quadrangular. Calix divisions ovate-lanceolate, acumi- 

 nate, ciliate. Petals much larger than the calix, oboval, 

 rather flat, bluish-white, the 2 lateral ones, cristately 

 bearded, the lower petal dilated, marked with 5 blue 

 stride, at the base a yellow spot. Style short, nearly cen- 

 tral, articulated at the base; stigma turbinate-capitate, 

 erostrate, slightly pubescent at tlie sides, foramen large. 

 Capsule nearly round. Closely allied to V. tricolor. Ap- 

 parently native. 



20. concolor Forster. Calix nearly equal with the petals, 

 naked, or not produced at the base, divergent; petals all 

 emarginate and connivent, the lower one bilobed, and not 

 produced behind into a spur or nectary; anthers connate; 

 capsule large; seeds pale, subglobose. Stem erect, round- 

 ish; leaves erect, numerous, scattered, sessile, cuneate- 

 lanceolate, acuminate, pubescent, irregularly toothed on 

 the upper part, attenuated below so as to appear subpe 

 tiolate; nerves strong, irregular or alternate; stipules 

 subulate; peduncles very short, about 3-flowered; flowers 

 greenish, appearing in April and May. Hab. From Penn- 

 sylvania to Upper Lousiana. Probably a distinct genus? 



Of this genus there are 21 species la Europe; 2 at the 

 Cape of Good Hope, one of them suffruticose, and both 

 very doubtful as genuine species of Viola,- 1 in the island 

 of Lufon, one in Teneriffe; another in the island of Ma- 

 clovian, another in India; 2 shrubby species in Chili, 1 in 

 Tierra del Fuego; 3 doubtful species (as Viola,) in the 

 tropical parts of America, one ©f them a scandent thorny 

 sbrub, with peduncles bearing many flowers! In the 



