- 33 - 
found the honey bee to be effective when confined to small area s . 
Helmbold ... states that honey bees collecting pollen cause trip- 
ping and attributes more tripping to them than to bumblebees . 
Asparagus 
Robbins, W. W. 
1931. The botany of crop plants. Ed. 3, 606 pp. Philadelphia. 
p. 244 j Pollination. — Common asparagus is almost entirely 
insect-pollinated. The nectaries are small and concealed at the 
base of the perianth. Standnate flowers are first to open. 
Bras si ca 
Magruder, R. 
1937. Improvement in the leafy cruciferous vegetables. TT. S. Dept. 
Agr. Yearbook 1937: 283-299. 
p. 283: According to most botanists, cabbage, cauliflower , 
broccoli . green-sprouting broccoli . brussels sprouts, kale, collards , 
and kohlrabi are very closely related, being horticultural forms of 
the species Bras si ca oleracea L. 
p. 291 : By planting in alternate rows strains that are self- 
compatible but cross-fertile, hybrid seed will result through the 
action of insects in carrying the 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 effective 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 
wOS tS ... . 
Broccoli 
Pearson, 0. H. 
1932. Incompatibility in broccoli and the production of seed under 
cages. Amer. Soc. Hort. Sci. Proc. 29: 468-471. 
p. 4.69: 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 situ- 
ation is such that seed can be produced with the pollen available. 
Buckwheat 
Leighty, C. E. 
1919. Buckwheat. U. S. Dept. Agr. Farmers 1 Bui. 1062, 24 pp. 
