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Brassica 
Magruder, R. 
1937. Improvement in the leafy cruciferous vegetables. U. S. Dept. 
Agr. Yearbook 1937: 283-299. 
p. 283: According to most botanists, cabbage, cauliflower , 
br occoli , gr ^an-spr outing b roccoli, b russ els sprouts, kale, col lards, 
and ko hlrabi are very closely related, being horticultural forms of 
the species Brassica oleracea L. 
p. 291: By planting in alternate rows strains that are self- 
compatible but cross-fertile, hybrid seed will result through the 
a ction of insects in carrying th e pollen from one strain to the other . 
Bud pollination of a few flower clusters of each strain results in 
enough seed to perpetuate the strains for later crops. Bees have been 
found to be very effecti v e agents in_the cross transfer of pollen , and 
by enclosing the individuals or groups of plants under cheesecloth 
cages the bees may be used in working out the problem of obtaining 
desirable crosses between different strains or increasing the seed of 
a number of desirable crosses for preliminary commercial tests ... , 
Broccoli 
Pearson, 0. H. 
1932. Incompatibility in broccoli and the production of seed under 
cages. Amer. Soc . Hort. Sci. Proc. 29: 468-471. 
p. 469: The results given here indicate that the use of small 
numbers of bees under cheesecloth cages is a possible method of pro- 
ducing small quantities of broccoli seed, if the compatibility situa- 
tion is such that seed can be produced with the pollen available. 
Buckwheat 
Leighty, C. E. 
1919. Buckwheat. U. S. Dept. Agr. Farmers' Bui. 1062, 24 pp. 
pp. 21-22: It is not advisable to grow buckwheat for use by 
bees alone. Commercial beekeeping in buckwheat-growing sections is 
advisable, as bees can make use of the flowers produced and may i n 
turn be of use in fertiliz i ng the flowers . Many buckwheat growers, in 
fact, believe that the weight per bushel of the seed is heavier where 
the crop ha s been worked largely by bees . 
Cabbage 
Pearson, 0. H. 
1932. Breeding plants of the cabbage group. Calif. Agr. Expt. Sta. 
Bui. 532, 22 pp. 
