TRENDS IN SYSTEMATIC BOTANY
97
our point of view about the organization of nature as is evident in the
process itself. Important advances in this field have already begun.
REFERENCES
Äkerberg, Ε. 1941. Cytogenetic studies in Poa pratensis and its hybrid with Poa
alpina. Hereditas 28: 1-126.
Anderson, E. 1936. The species problem in Iris. Ann. Missouri Botan. Garden
23: 457-509.
Anderson, E. 1937. Cytology in its relation to taxonomy. Botan. Rev. 3: 335-350.
Anderson, E. 1949. "Introgressive Hybridization," 109 pp. Wiley, New York.
Anderson, E. 1953. Introgressive hybridization. Biol. Revs. 28: 280-307.
Anderson, E., and Cage, A. 1952. Introgressive hybridization in Phlox bifida.
Am. J. Botany 39 : 399-404.
Anderson, E., and Hubricht, L. 1938. Hybridization in Tradescantia. III. The
evidence for introgressive hybridization. Am. J. Botany 25 : 398-403.
Anderson, E., and Sax, K. 1936. A cytological monograph of the American species
of Tradescantia. Botan. Gaz. 97: 433-476.
Anderson, E., and Stebbins, G. L., Jr. 1954. Hybridization as an evolutionary
stimulus. Evolution 8: 378-388.
Avers, C. J. 1953a. Biosystematic studies in Aster. I. Crossing relationships in
the Heterophylli. Am. J. Botany 40: 669-675.
Avers, C. J. 1953b. Biosystematic studies in Aster. II. Isolating mechanisms
and some phylogenetic considerations. Evolution 7: 317-327.
Babcock, Ε. B. 1944a. New light on evolution from research on the genus Crepis.
Am. Naturalist 78: 385-409.
Babcock, Ε. B. 1944b. Endemism in Crepis. Proc. Calif. Acad. Sei. 25: 269-290.
Babcock, Ε. B. 1947a. The genus Crepis, part I. The taxonomy, phylogeny, distribution and evolution of Crepis. Univ. Calif. (Berkeley) Pubis. Botany 21:
1-197.
Babcock, Ε. B. 1947b. The genus Crepis, part II. Systematic treatment. Univ.
Calif. (Berkeley) Pubis. Botany 22: 199-1030.
Babcock, E. B. 1947c. Cytogenetics and speciation in Crepis. Advances in Genet.
1: 69-93.
Babcock, Ε. B., and Stebbins, G. L., Jr. 1938. The American species of Crepis.
Their interrelationships and distribution as affected by polyploidy and apomixis.
Carnegie Inst. Wash. Publ. No. 504, 199 pp.
Babcock, E. B., Stebbins, G. L., Jr., and Jenkins, J. A. 1937. Chromosomes and
phylogeny in some genera of the Crepidinae. Cytologia, Fujii Jubilee Vol. pp.
188-210.
Bailey, I. W. 1949. Origin of the Angiosperms: need for a broadened outlook.
/. Arnold Arboretum (Harvard Univ.) 30: 64-70.
Bailey, I. W., and Howard, R. A. 1941. The comparative morphology of the
Icacinaceae. IV. Rays of the secondary xylem. /. Arnold Arboretum (Harvard
Univ.) 22: 556-568.
Bailey, P. C. 1951. A study of the chromosome morphology of some species of
Trillium. Bull. Torrey Botan. Club. 78: 324-330.
Baker, H. G. 1951. Hybridization and natural gene-flow between higher plants.
Biol. Revs. 26 : 302-337.
97
our point of view about the organization of nature as is evident in the
process itself. Important advances in this field have already begun.
REFERENCES
Äkerberg, Ε. 1941. Cytogenetic studies in Poa pratensis and its hybrid with Poa
alpina. Hereditas 28: 1-126.
Anderson, E. 1936. The species problem in Iris. Ann. Missouri Botan. Garden
23: 457-509.
Anderson, E. 1937. Cytology in its relation to taxonomy. Botan. Rev. 3: 335-350.
Anderson, E. 1949. "Introgressive Hybridization," 109 pp. Wiley, New York.
Anderson, E. 1953. Introgressive hybridization. Biol. Revs. 28: 280-307.
Anderson, E., and Cage, A. 1952. Introgressive hybridization in Phlox bifida.
Am. J. Botany 39 : 399-404.
Anderson, E., and Hubricht, L. 1938. Hybridization in Tradescantia. III. The
evidence for introgressive hybridization. Am. J. Botany 25 : 398-403.
Anderson, E., and Sax, K. 1936. A cytological monograph of the American species
of Tradescantia. Botan. Gaz. 97: 433-476.
Anderson, E., and Stebbins, G. L., Jr. 1954. Hybridization as an evolutionary
stimulus. Evolution 8: 378-388.
Avers, C. J. 1953a. Biosystematic studies in Aster. I. Crossing relationships in
the Heterophylli. Am. J. Botany 40: 669-675.
Avers, C. J. 1953b. Biosystematic studies in Aster. II. Isolating mechanisms
and some phylogenetic considerations. Evolution 7: 317-327.
Babcock, Ε. B. 1944a. New light on evolution from research on the genus Crepis.
Am. Naturalist 78: 385-409.
Babcock, Ε. B. 1944b. Endemism in Crepis. Proc. Calif. Acad. Sei. 25: 269-290.
Babcock, Ε. B. 1947a. The genus Crepis, part I. The taxonomy, phylogeny, distribution and evolution of Crepis. Univ. Calif. (Berkeley) Pubis. Botany 21:
1-197.
Babcock, Ε. B. 1947b. The genus Crepis, part II. Systematic treatment. Univ.
Calif. (Berkeley) Pubis. Botany 22: 199-1030.
Babcock, E. B. 1947c. Cytogenetics and speciation in Crepis. Advances in Genet.
1: 69-93.
Babcock, Ε. B., and Stebbins, G. L., Jr. 1938. The American species of Crepis.
Their interrelationships and distribution as affected by polyploidy and apomixis.
Carnegie Inst. Wash. Publ. No. 504, 199 pp.
Babcock, E. B., Stebbins, G. L., Jr., and Jenkins, J. A. 1937. Chromosomes and
phylogeny in some genera of the Crepidinae. Cytologia, Fujii Jubilee Vol. pp.
188-210.
Bailey, I. W. 1949. Origin of the Angiosperms: need for a broadened outlook.
/. Arnold Arboretum (Harvard Univ.) 30: 64-70.
Bailey, I. W., and Howard, R. A. 1941. The comparative morphology of the
Icacinaceae. IV. Rays of the secondary xylem. /. Arnold Arboretum (Harvard
Univ.) 22: 556-568.
Bailey, P. C. 1951. A study of the chromosome morphology of some species of
Trillium. Bull. Torrey Botan. Club. 78: 324-330.
Baker, H. G. 1951. Hybridization and natural gene-flow between higher plants.
Biol. Revs. 26 : 302-337.