? : * ‘ 
PENTANDRIA. MONOGYNIA. | 151 
18. Nuttalli. Pursh. Perennial. Stem simple, erect and 
leafy, 4 to 6 inches high. Leaves lanceolate-ovate, entire, 
attenuated 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 
under 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. Elliett, p. 302. Annual. Stem 
simple, erect, acutely triquetrous. Radical leaves spa- 
thulate-oval, with a few denticulations, upper leaves 
spathulate-lanceolate, or ovate, smooth. a, fe large, 
cristate-palmate, ciliate, deeply 7 to 9lobed, 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 
striz, at the base a yellow spot. Style short, nearly cen- 
tral, articulated at the base; stigma turbinate-capitate, 
erostrate, slightly pubescent at the 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 
greenish, pearing in April anc xe f Has. From Penn- 
sylvania to Upper i obably a distinct genus? 
—” OF this there are 21 species ia 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. 
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