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Smith, W. W. 



1936. Problems in classifications of plants. Journ. Roy. Hort. Soc, 61:77-90, 117-1S4. 



SOLEREDER, H. 



1908. Systematic Anatomy of the Dicotyledons. Transl. by L. A. Boodle and F. E. 

 Fritsch. 2 vols. Oxford: Clarendon Press. 



Sporne, K. R. 



1948. Correlation and classification in dicotyledons. Proc. Linn. Soc, 160:40-47. 



1949. A new approach to the problem of the primitive fiower. New Phytol., 48:259-276. 



Spragtje, T. a. 



1925. The classification of dicotyledons. Journ. Bot, 63:9-13, 105-113. 



1940. Taxonomic botany, with special reference to the angiosperms. In J. Huxley, 

 New Systematics, pp. 435-454. 



Sprotte, K. 



1940. Untersuchungen iiber Wachtsum und Nervatur der Friichtblatter. Bot. Archlv, 



40:463-506. 



Staudermann, W. 



1924. Die Haare der Monokotylen. Bot. Archiv, 8:105-184. 



Stebbins, G. L. 



1938. Cytological characteristics associated with the different growth habits in the 

 dicotyledons. Amer. Journ. Bot., 25:189-198. 



1950. Variation and Evolution in Plants, xix + 643 pp. New York: Columbia Univ. 



Press. 



1951. Natural selection and the differentiation of angiosperm families. Evolution, 



5:299-324. 



Stern, W. L. 



1952. The comparative anatomy of the xylem and the phylogeny of the Julianiaceae. 



Amer. Journ. Bot, 39:220-229. 



Stoudt, H. N. 



1941. The floral morphology of some of the Capparidaceae. Amer. Journ. Bot., 28: 



664-675. 



Suessenguth, K. 



1921. Beitrage zur Frage des systematischen Anschlusses der Monokotylen. Beih. 

 Bot. Centr., 38(2): 1-79. 



Suessenguth, K., and H. Merxmuller 



1952. Ueber die Herkunft der Angiospermen. Phyton, 4:1-8. 



SWAMY, B. G. L. 



1949. Further contributions to the morphology of the Degeneriaceae. Journ. Arnold 

 Arbor., 30:10-38. 



SwAMY, B. G. L., and I. W. Bailey 



1949. The morphology and relationships of Cercidipliyllum. Journ. Arnold Arbor., 



30:187-210. 



1950. Sarcandra, a vesselless genus of the Chloranthaceae. Journ. Arnold Arbor., 



31:117-129. 



Takhtajan, A. L. 



1953. Phylogenetic principles of the system of higher plants. Bot. Rev., 19:1-45. 



