308 INDEX TO AMERICAN BOTANICAL LITERATURE 
Baker, F. S. Black walnut, its growth and management. U. S. 
Dept. Agr. Bull. 993: 1-43. pl. 1-7 + f. 1-4. 8 Mr 1921. 
Barker, E. E. E] mejoramiento de nuestras siembras por la seleccion. 
Puerto Rico Dept. Agric. y Trab. Circ. 30: 3-23. Jl 1920. 
Barrett, J. T. Apricot fruit spots. Univ. California Jour. Agr. 3: 
346-349. My 1916. [Illust.] _ 
Barss, H. P. Apple tree anthracnose. Rep. Board Hort. Oregon 16: 
329-130. 1921. [Illust.] 
Benoist, R. Contribution a l'étude de la flore de la Guyane frangaise. 
Bull. Mus. Hist. Natur. 1920: 351-357. 1920. 
Includes 2 new species in Casearia. 
Benoist, R. Plantas recoltées par M. Wachenheim en Guyane fran- 
¢aise. Bull. Mus. Hist. Natur. 1920: 555-560. 1920. 
Includes Duroia plicata sp. n 
Berbert-Hammond, B. The tellin arbutus. Fl. Grow. 8:63. 1 Ap 
1921. 
Blake, S. F.. New trees and shrubs from Yucatan. Proc. Biol. Soc. 
W. ashington 34: 43-46. 31 Mr 1g21. 
New species in Acacia (2), Diospyros (1), Citharexylum (1), Randia (1) ‘and 
Notoptera (1). 
Blakeslee, A. F. A graft-infectious disease of Datura resembling a 
vegetative mutation. Jour. Genet. 11: 17-36. pl. 2-6. 21 Ap 
1921. “ 
Bliss, M. C. The vessel in seed plants. Bot. Gaz. 71: 314-326. pl. 
r6-20. 15 Ap 1921. 
Borgesen, F. The marine algae of the Danish West Indies. Ill. 
Dansk Bot. Ark. 3: 369-504. f. 361-435. 1920. 
Includes Coelothrix and Hypneocolax gen. nov., and new species in Gracilaria (1), 
Rhodymenia (1), Endoderma (2), Ascocyclus (1), Myriotrichia (1), Acrochaetium (1)- 
Bowman, H. H. M.. Deterioration in some horticultural varieties 
cleebiaas et artificial selection. Jour. Hered. rr: 380-383- 
19 Ap 19 
Studied EES Zinnia, Tagetes, Matthiola and Centaurea. 
Brannon, J. M. A simple method for growing plants. Am. Jour. 
Bot. 8: 176-178. f. r: 3 Ap 1921. 
Britton, N. L. The leafy spurge becoming a pest. Jour. New York 
Bot. Gard. 22: 73-75. f. 1. Ap 1g2t. 
Brotherus, V. F. Contribution A la flore bryologique de 1’Ecuador. 
Rev. Bryol. 47: 1-16, 35-46. 1920. 
Includes 36 new species. 
