i9i 7) WENIGER— EUPHORBIA 279 



8. Lyon, Florence, Contribution to the life history of Euphorbia corollata. 

 Bot. Gaz. 25:418-426. 1898. 



9. Mirbel, C. F., Histoire naturelle generate et particuliere des plantes. 

 Paris. 1 800-1 809; cited by Hegelmaier (6). 



10. Mobius, M., Microscopisches Practicum fiir systematische Botanik. 

 Berlin. 191 2 (pp. 107-109). 



11. Modilewski, J., Zur Embryoentwicklung von Euphorbia procera. Ber. 

 Deutsch. Bot. Gesells. 27:21-26. 1909. 



12. , Weitere Beitrage zur Embryoentwicklung einiger Euphorbiaceen. 



Ber. Deutsch. Bot. Gesells. 28:413-418. 1910. 



i3» , Die anomale Embryosackentwicklung bei Euphorbia palustris. 



Ber. Deutsch. Bot. Gesells. 29:430-436. 191 1. 



14. Pax, F., Euphorbiaceae. Engler und Praxtl, Die naturlichen Pflanzen- 

 familien. 5:1-119. Leipzig. 1887. . 



15. Payer, J. B., Traite d'organogenie comparee de le fleur. Paris. 1857; 

 cited by Schweiger (20). 



16. Poisson, J., Du siege des matieres colorees dans la graine. Bull. Soc. Bot 

 France 25:47, 60. 1878. 



17- Roeper, J. A. C, Enumeratio Euphorbiarum. 1824 (pi. 1. fig. 6y)\ 

 cited by Hegelmaier (6) . 



18. Schmidt, H., Ober die Entwicklung der Bliiten und Bliitenstande von 

 Euphorbia. Beih. Bot. Centralbl. 22:21-69. 1907. 



19- Schweiger, J., Beitrage zur Kenntnis der Samenentwicklung der Euphor- 

 biaceen . Flora 94 : 3 3 9-3 82. 1 905 . 



20. Strasburger, Jost, Schenk, und Karsten, Lehrbuch der Botanik. 

 Jena. 1910 (pp. 473-477). 



EXPLANATION OF PLATES XIV-XYI 



All drawings were made with an Abbe camera lucida at table level, and 

 Leitz oculars and objectives. The following combinations were used: ocular 4, 

 objective 3, tube length 170 mm. (X200), figs. 1-10, 24, 28-31; ocular 4, 

 objective 6, tube length 170 mm. (X800), figs. 11, 23; ocular 4, oil immersion 

 1/16, tube length 170 mm. (X2000), figs. 12, 13, 22, 33, 41, 45~475 ocular 4, 

 oil immersion 1/16, tube length 212 mm. (X2600), figs. 14-21, 34~4°; 

 ocular i, objective 3, tube length 140 mm. (Xioo), figs. 25, 27, 32; ocular 4, 

 oil immersion 1/16, tube length 140 mm. (X1700), figs. 42-44, 4 8 ~5 6 - 



The following abbreviations are used: b, bract; c, carpel; cot, cotyledon; 

 en, endosperm nucleus; en d, endosperm; i, integument; it. inner integument; 

 m 9 involucre; n. nucellus; 0, ovule; ob y obturator; oi, outer integument; 

 p, papilla; re, root cap; j*, staminate flower; s 2 , secondary staminate flower; 

 sg, stigma. 



In all figures the micropylar end is at the top of t 

 42-50 are reconstructed from 2 or 3 sections each. 



1 





