Polygala polygama and P. pauczfiora. 149 
EXPLANATION OF PLATES XVI-XVIL. 
Plate XVI. Plant of Polygala polygama as seen in early August. All types 
of flower are seen. Some of the shoots have been removed. 
Plate XVII. 
Fig. 1. Pistil from chasmogamic flower. 
Fig. 2. Pistil from aérial cleistogamic flower. 
Fig. 3. Pistil from subterranean cleistogamic flower. Drawn to scale. On 
the ovaries are seen the glandular hairs. 
Figs. 4a 4b, 5a 5b, 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 aérial cleistogamic flower, corresponding to 6a 6b 
of the chasmogamic. 
Fig. 92 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. 11. Lower (outer) epidermis from sepal of chasmogamic flower. 
Fig. 12. Lower (outer) epidermis from sepal of aérial cleistogamic flower. 
Fig. 13. Lower (outer) epidermis from sepal of subterranean cleistogamic 
flower. Figs. 10-13 are drawn to scale under camera lucida. 
