33^ BOTANICAL GAZETTE [November 



I am under obligation to Captain J. Donnell Smith for the 

 freest use of his library and herbarium material, and to Mr. W. 

 C. Coker for collecting seeds of Peperomia and Heckeria in 

 Jamaica. 



Johns Hopkins University, 



Baltimore. , 



LIST OF WRITINGS REFERRED TO. 



Bessev, C. E., Phylogeny and taxonomy of the angiosperms. BoT. Gaz. 

 24 : 145-178. 1897. 



Campbell, D. H., Die Entwickelung des Embryosackes von Pepey-omia 

 pellucida Kunth. Ber. Deutsch. Bot. GeselL 17 : 452-456. PL3I' 1899. 



. The embryo-sac of Peperomia. Annals of Botany 15 '- 



103-117.//, d, I go I. 



Cook, M. T., Development of the embryo-sac and embryo of Casiaha 

 odorata and Nymphaea advena. Bull. Torr. Bot. Club 29: 211-220. pis, 

 12-1J, 1902. 



Engler. a., Syllabus der Pflanzenfamilien, pp. 101-115. 1898. [2d ed.] 



GOEBEL, Km Organographie der Pflanzen, p. 806. igoi. 



Haeerlandt, G„ Physiologische Pflanzenanatomie, p. 2 1 o. 1 896. [2d ed.] 



Hartz, C. O,, Landwirthschaftliche Samenkunde. 1885. 



Hegelmater, F., Untersuchungen ueber die Morphologic des Dikoty- 

 ledonen-Endosperms. Nov. Act. Acad. Caes. Leop. Car. 49 : 1-104. pis, 1-5- 

 1885. 



Hofmeister, W., Neue Beitriige zur Kenntniss der Embryobildung der 

 Phanerogamen. Abhandl. Konigl. Sachs. GeselL Wiss. 6:535-672. P^^- 

 1-27. 1859. 



Humphrey. J. E., The development of the seed in the Scitamineae. 

 Annals of Botany 10 : 1-40.//^. 1-4, i8g6. 



Johnson, D. S., On the endosperm and embryo of Peperomia pelluada. 

 BoT, Gaz. 30: i-ir. pi. /. i90o\ 



-. On the development of Saiirurus cernmis. Bull. Torr. Bot. 



Club 27: 365-372. pi. 23. Igoo^ 



SCHMiTZ, F., Die Bluthenentwickelung der Piperaceen. Hanstein Bot. 

 Abhandl. 2: i-74. pis. 1-5. 1875. 



Schnegg, H„ Beitrage zur Kenntniss der Gattung Gunnera. Flora 

 90 : 204. figs, 26-28. igo2, 



Strasburger. E., Einige Bemerkungen zur Frage der ''doppelten 

 Befruchtung" bei den Angiospermen. Bot. Zeit. 58: 293. 1900. 



EXPLANATION OF PLATES IX-X. 



Abbreviations used: ant, antipodal ; arspy primary archesporial cell ; or, 

 subtending bract ; cot, cotyledon ; cp, carpel ; cp^, external layer of carpellary 



