Kraemer : Morphology of the Genus Viola 175 



A more or less developed lip-like appendage at the opening of 

 the stigma is found in F, hctcropjiylla^ K lutca and V, tricolor and 

 its varieties. 



Style ix Detail. 



The length of style varies from 1.8 mm. (in V, luted) to 3.9 

 mm. (in V. pcdatd). In the following species there is a decided 

 bend in the. style near the base : V. Canadensis^ V. hastata, l\ 

 lutea, K hcterophylla, V. rotundifolia, V. NuttallU, V. scahrinsctda, 

 K tricolor and its varieties and K tripartita. The following pos- 

 sess a slight bend in style : V. arenaria, V, blanda^ K palnstris, K 



rcnifolia, V. delphini folia, V. palniata, V, obliqua and V. odorata. 



In the following species the style is nearly straight : V. pedata, 



V. sororia, V. striata, V, Selkirkii, ]\ Labradorica, V. rostrata, V, 



prininlaefc 

 he species 



The shape 



Stamen in Detail. 



, The length of sac-like or spurred nectar- secreting appendage 

 is in the following species from 0.9 mm. to 1.3 mm, in size and 

 less than anther cells : V, lanccolata, V, palustris, V. renifolia, V. 

 blanda and [^ prininlaefolia. 



In the following species the spur Is from 1.8 to 2.(> mm. in 



width and same length as anther cells : K hastata, K Xuttallii, 

 V, Canadensis^ V, rotundifolia, V, scahriuscula, V. pubescens and 



V. tripartita. 



In the following species the spur extends below the anther to the 

 distance in mm. indicated in the figures in parenthesis : V. tricolor 

 arvensis (1.5), V, ovata (r.5), V. pedata (1.8), V, tricolor vulgaris 

 (2.0), V. palniata (2.3), V. arenaria (2.6), V. licteropJiylla {2X:>), V, 

 Labradorica {2,6), J\ sororia (2.6), K striata (2.6), K lutca (2.8), 

 K obliqua (2.8), V. sagittata (2.8), V. delphinifolia (3.0), V, Scl- 



kirkii (3.1), V. odorata {l.(:>), V. rostrata (9.3). 



In the following species papillae are not found on anther cells 

 but only upon the nectar-secreting spur ; V. arenaria, V, Canadcji- 

 sis, V, lanceolata, V. odorata. In addition to the presence of 

 papillae on the spur the following possess long (100 fji) hairs with 

 a slight crook at the end on anther cells : V, hctcrophylla, F 

 lutca, and V, tricolor and its varieties. The remaining possess only 

 papillae In both spur and the anther cells. 



