Poly gala polygama and P. pajiciflora. 149 



EXPLANATION OF PLATES XVI-XVIL 

 Plate XVL Plant of Polygala polygama as seen in early August. All tj-pes 



of flower are seen. Some of the shoots have been removed. 

 Plate XVIL 



Fig. I. Pistil from chasmogamic flower. 



Fig. 2. Pistil from aerial cleistogamic flower. 



Fig. 3. Pistil from subterranean cleistogamic flower. Drawn to scale. On 

 the ovaries are seen the glandular hairs. 



Figs. 4a 4b, 5a Sb, 6a 6b, 7a 7b, stages in the enlargement of the micro- 

 spores of the chasmogamic flower, taken from successive blooms on the 

 same axis, (a), and (b) refer in each case to longitudinal and transverse 

 sections respectively. 



Fig. 8a 8b, stage from an aerial cleistogamic flower, corresponding to 6a 6b 

 of the chasmogamic. 



Fig. 9a 9b. Corresponding stage in the subterranean cleistogamic. All the 

 microspore sections drawn under camera to same scale. 



Fig. 10. Lower epidermis of foliage leaf. 



Fig. II. Lower (outer) epidermis from sepal of chasmogamic flower. 



Fig. 12. Lower (outer) epidermis from sepal of aerial cleistogamic flower. 



Fig. 13. Lower (outer) epidermis from sepal of subterranean cleistogamic 

 flower. Figs. 10-13 ^^^ drawn to scale under camera lucida. 



