56 THE FETJIT OF OPTJNTIA FCILGIDA. 



LITERATURE CITED. 



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fur Naturwiss., 2, pp. 30-80. 

 Cbookeb, W. 1906. Role of Seed-coats in Delayed Germination. Bot. Gaz., 42, pp. 



265-290. 

 Dabbishike, O. V. 1904. Observations on Mammillaria elongata. Ann. of Bot., 18, 



pp. 375-416. 

 Debet, M. H. 1846. Proliferation d. Fruchtknotens lieferte eine Opuntia Salm- 



Dyckiana. Verhandl. d. Naturhist. Ver. Preuss. Rheinl., 3, 83, 84. 

 Dkt.avapd, M. C. 1858. Inflorescence du Peireskia tleo. Bull. Soc. Bot. de France, 



5, p. 685. 

 Delbbottck, C. 1875. Die Pflanzenstacheln. Hanstein Botan., Abhandl. 2, pp. 1-119. 

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 Ganong, W. p. 1894. Beitrage zur Kenntniss der Morphologic und Biologie der 



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 . 1898. The Comparative Morphology of the Embryos and Seedlings of the 



Cactacese. Ann. of Bot, 12, pp. 423-474. 

 GOEBEL, Karl. 1886. Zur Entwickelungsgeschichte des Unterstandigen Frucht- 

 knotens. Bot. Zeit., 44, pp. 729-738. 



. 1889. Pflanzenbiologischeschilderungen. I. Kakteen, pp. 67-108. 



Geiffiths, D. 1913. Behavior, Under Cultural Conditions, of Species of Cacti 



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 Habeis, J. A. 1905. The Fruit of Opuntia. Bull. Torrey Bot. Club, 32, pp. 531-536. 

 HiLDEBEANDT, F. 1888. Ueber Bildung von Laubsprossen aus Bliithensprossen bei 



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 Katttpmann, N. 1859. Zur Entwickelungs. d. Cactaceenstacheln. Bull. Soc. Imp. 



des Naturalistes de Moscow, 32, part II, pp. 585-603. 

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World, 10, pp. 31-39. 



. 1916. Abscission in Miraiilis jalapa. Bot. Gaz., 61, pp. 213-230. 



Meehan, T. 1888. Opuntia Fruits. Gard. Chron., 3, p. 328. 



Noll, P. C. 1872. Zwei Abnormitaten an Cactusfriichten. Ber. d. Senckenbg. 



Gesell., 1872, p. 118. 

 Pbnzio, O. 1890. Pflanzenteratologie. Genoa. 

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. 1890. Flora Brasiliensis, IV, 2. 



SoLEEEDEE, H. 1908. Systematic Anatomy of the Dicotyledons. Engl. Transl., pp. 



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—. 1898. The Tree Opuntias of the United States. Bot. Gaz., 25, pp. 119-124. 



. 1905. Notes on the Fruits of Some Species of Opuntia. Bull. Torr. Bot. 



Club, 32, pp. 235-239. 

 Wettebwald, X. 1889. Blatt- und Sprossbildung bei Euphorbien und Cacteen. 



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 ZTJOCABI^fI, J. G. 1836. Plantarum novarum vel minus cognitarum, etc. Fasc. 



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pp. 599-742. 



