464 ^ CENTURY OF PROGRESS IN THE NATURAL SCIENCES 



Hagekup, O. 



1930. Vergleichende morphologische und systematische Studien liber die Ranken und 

 andere vegetative Organe der Cucurbitaceen und Passifloraceen. Dansk Bot. 

 Ark., 6(8): 1-103. 



1938. On the origin of some angiosperms through the Gnetales and the Coniferae. 



III. The gynaecium of Salix cinerea. K. Danske Vidensk. Selsk. Biol. Meddel., 



14(4):l-34. 

 1942. The morphology and biology of the Cor^/ZMS-fruit. K. Danske Vidensk. Selsk. 



Biol. Meddel., 17(6): 1-32. 



Hall, B. A. 



1951. The floral anatomy of the genus Acer. Amer. Journ. Bot., 38:793-799. 



Hall, H. M. 



1928. The genus Ha-plopa-pims, a Phylogenetic Study in the Compositae. Carnegie 

 Inst. Washington Publ. 389. viii + 391 pp. 



Hall, J. W. 



1952. The comparative anatomy and phylogeny of the Betulaceae. Bot. Gaz., 113: 



235-270. 



Hallier, H. 



1905. Provisional scheme of the natural (phylogenetic) system of flowering plants. 

 New Phytol., 4:151-162. 



1912. L'origine et le systeme phyletique des angiospermes exposes a I'aide de leur 

 arbre genealogique. Arch. Neerl. Sci. Exact, et Nat., ser. IIIB, 1:146-234. 



Hallock, Frances A. 



1930. The relationship of Garrya; the development of the flower and seeds of Garrya 

 and its bearing on the phylogenetic position of the genus. Ann. Bot., 44: 

 771-812. 



Hammen, L. van der 



1948. Traces of ancient dichotomies in angiosperms (a contribution to our knowl- 

 edge of phyllospory and stachyspory). Blumea, 6:290-301. 



Hare, C. L. 



1944. The anatomy of the petiole and its taxonomic value. Proc. Linn. Soc, 155: 

 223-229. 



Harris, T. M. 



1940. Caytonia. Ann. Bot, ser. 2, 4:713-734. 



Id51a. Caytonanthus. the microsporophyll of Caytonia. Ann. Bot., ser. 2, 5:47-58. 



1951b. The relationships of the Caytoniales. Phytomorphology, 1:29-39. 



Hayata, B. 



1921. The natural classification of plants according to the dynamic system. Icones 



plantarum formosanarum, 10:97-234. 

 1931. Ueber das "dynamische System" der Pflanzen. Ber. Deutsch. Bot. Ges., 49: 

 328-348. 



Hedberg, 0. 



1946. Pollen morphology in the genus Polygonum L. s. lat. and its taxonomical sig- 

 nificance. Svensk Bot., Tidskr.. 40:371-404. 



Heimsch, C, Jr. 



1938. The significance of anatomy in taxonomic studies in the Juglandaceae. Amer. 

 Journ. Bot., 25:20s. (Abs.) 



