SPONTANEOUS CROSSING IN THE GARDEN BEAN 397 


TABLE 1. Percentage of crossings found in the experiments 
of 1918—1919. 








1 2 3 4 | 5 CAN LES 
casse |s2_|s el 43 
Sr som 2 a © |A 2 |A = u 
Tested variety Bean-culture E2uE25 E25 8835| SS 
3. 8/5 -|3 -|3 > 7 
Zoggs 25 |4 4 en 
Kaiser Wilhelm...... Wax flageolet......... 4 12 61 0 0,00 
DRM MR = CIE GHEVEIER 25-205 Re 1 1 v4 0 0,00 
Risbrinken.............: | Wax'flageolet......... 1 2 2 0 0,00 
Dutch sword ......... ean, ote 4 | 28 | 239 | 0 | 0,00 
Uppland sword... .. » 3 9 19 0 0,00 
North SAT =... » 3 3 3 0 0,00 
Broad sword ......... Mer PNPM ony 2 131-230 1 2,56 
Mottled brown ...... Ns ee Saat ee 4 1% 74 1 1,35 
Chocolate brown ... | Risbrinken ............ 5 7 39 3 7,69 
» sc FNaxfastokRt. 32.00%. 3 10 40 2 5,00 
Brown bean............ Chocolate brown ... 3 16 | 261 0 | 0,00 
We poten tesco aa Wax flageolet.......... 2 7 48 0 0,00 
» LAS OR M CHEVIIET % vas 1 2 23 0 0,00 
De Seek ie Tae Risbrinken ............ 3 11 55 0 0,00 
Amer. TepiLriog: 65555 | Bagh: Henne were 1 1 3 0 0,00 
Emperor of Russia OR NE Cet Re 2 5] 13 0. | 0,00 
Dis af ot age PE ARC » EEE 1 1 16 1 6,25 
| AE EC AS MR AT EE | Wax flageolet 1 2 11 0 | 0,00 
Total | 44 | 137 | 959 | 8 | 08 

differences between the main groups are, however, rather important. 
The shell-beans show a percentage of cross-pollination that is con- 
siderable higher than that of the haricots vert. The sword-beans are 
fairly intermediate. The high value found in the haricots vert in 
1918 points in quite a wrong direction as only 43 plants of this 
group were grown this year, giving one hybrid. In fact, it is the only 
one of this main group found in these experiments, whereas in 
another trial with a haricot vert, viz. the Steninge Hybrid, 11 hybrid 
plants were found among 547 recessive steel-coloured, whose parents 
had grown side by side with the dominant black ones without being iso- 
lated. This shows a cross-pollination of about 2 %. 
This greater tendency of autogamy in the haricots vert depends 
probably to some extent on the fact that they begin to flower a little 
later than the large field cultures (this is at least the case with some 
varieties). However, this may only be of rather small importance 
as the flowering period of beans is of relatively long duration. 

