VIOLARIE^E 



195 



belong to the genus Viola. The cotyledons of V. tricolor (fig. 

 188) are broadly oval, obtuse, entire, and petiolate. The lamina 

 is proportionately longer and narrower in V. canina, and V. 

 palustris (fig. 189), where it is oblong, obtuse, and in the latter 

 mucronulate. The variations from these types are probably 

 slight except in the cases of narrow or short cotyledons as 

 mentioned above. 



Viola tricolor, L. (fig. 188). 



Primary root tapering, colourless, long, giving off lateral rootlets, 

 annual. 



Hypocotyl tapering indistinguishably into the root, subterranean, 

 colourless. 



Cotyledons oval, ob- 3 



tuse, glabrous, petiolate ; 

 lamina 6 mm. long, 3'5 

 mm. broad. 



Stem developed 

 when about to flower, 

 herbaceous, annual; 1st, 

 2nd, and 3rd internodes 

 undeveloped ; 4th 1'5 

 mm. long ; 5th I mm. 

 long. 



Leaves simple, radi- 

 cal and cauline, alter- 

 nate, stipulate, petiolate, 

 glabrous, or finely pub- 

 escent at the margins, 

 deep green above, paler 

 beneath ; petioles chan- 

 nelled on the upper 

 side, and scaberulous, or 

 finely pubescent, along 

 the edge of the channel ; 

 stipules large, foliaceous, 

 unequally lyrate-pinna- 

 tifid or -partite, with 

 linear, obtuse, or oblanceolate-linear segments the middle lobe 

 largest and entire, or in adult and robust specimens more or less 

 crenate and spathulate. 



No. 1. Broadly ovate, rounded at the end, shallowly crenate. 



No. 2. Cordate-ovate, obtuse, shallowly crenate. 



o 2 



FIG. 188. Viola tricolor. Nat. 



