182 CARROLL— ON DEVELOPMENT OF 



Reiche, K. Balsamlnaceae, 1895, in Engler and Prantl, Die Natiir- 



lichen Pflanzenfamilien. 



50. Robertson, C. Flowers and Insects. Ill Bot. Gaz. XIV, 1889, p. 300. 



51. Van Ingen, G. A note: Bees Mutilating Flowers. Bot. Gaz. XII, 1887, 



p. 229. 



Plate LV 

 Fig. 1. Cross section of bud of chasmogamous flower with only bract developed. 



xiio. 



A — bract. 

 Fig. 2. Cross section of bud of chasmogamous flower with lateral and posterior 



sepals. X125. 



A — bract. 



B — lateral sepal. 



C — posterior sepal. 

 Fig. 3. Cross section of bud of chasmogamous flower with four sepals. X125. 



A — bract. 



B — lateral sepals. 



C — posterior sepals. 



D — anterior sepal. 

 Fig. 4. Cross section of bud of chasmogamous flower with stamens arising. X 100. 



E — anterior lobe of petal. 



F — stamen. 

 Fig. 5. Longitudinal section of bud of chasmogamous flower. X30. 



A — carpels. 



B — ligular appendage of stamen. 

 Fig. 6. Cross section of bud of chasmogamous flower showing origin of septa of 



ovary. X40. 

 Fig. 7. Longitudinal section of buds of cleistogamous flower. X50. 



A — bract. 



B — posterior sepal. 

 Fig. 8. Longitudinal section of bud of cleistogamous flower showing origin of 



stamens X95. 



C — stamen. 

 Fig. 9. Cross section of mature cleistogamous flower. X40. 



A — bract. 



B — lateral sepal. 



C — posterior sepal. 



D— anterior sepal. 



E — anterior lobe of petal. 



F-^posterior lobe of petal. 

 Fig. 10. Cross section of anther lobe showing pollen archesporium. XIOOO. 

 Fig. 11. Cross section of anther lobe showing degenerating plates of pollen mother 



cells. X125. 

 Fig. 12. Cross section of anther lobe in pollen tetrad stage. X 100. 

 Fig. 13. One nucleate pollen grain. X 1000. 

 Fig. 14. Pollen grain with tube and generative nuclei. XIOOO. 

 Fig. 15. Cross section of cleistogamous anther near maturity. X200. 



