254 BOTANICAL GAZETTE : [OCTOBER 
more slender than in O. Lamarckiana; the anthers are thin, provided 
with a good supply of pollen on stout specimens, but often deficient 
in this production on the weaker ones, especially in annual cultures. 
O. Lamarckiana mut. cana.—Among the cana mutants from 
O. Lamarckiana only one specimen has been self-fertilized. It 
arose in 1913 in the fourth guarded generation from a plant intro- 
duced into my garden in 1905 from the original field near Hilver- 
sum. It was only recognized at the end of July, when it opened its 
first flowers. It yielded few seeds, which gave rise to 19 seedlings 
only, all of which flowered in 1914. Of these, 13 exactly duplicated 
the type of O. Lamarckiana, 5 were cana, and one was a mutant 
nanella. ‘These figures point to a percentage of 26 per cent cana. 
O. cana from lata no. 1.—From the first mutant of 1906- 
1907, previously described, I have derived a pedigree family in — 
order to try its constancy and got the following result: 
1g06-1907....Mutant Mutant 
TOUs ee Second generation 16 per cent cana ‘Lamarckiana 
FORGO s Third generation 24-34 per cent cana Lamarckiana Lamarckiana 
The size of these cultures is given in table I. 
TABLE I 
2 OFFSPRING se 
YEAR GENERATION PaRENT CENTAGE Mutants 
Total Flowering | °F = 
NOS 1, Second | mutant 31 30 .G 4 ee 
1013: Third cana 49 48 24 1 nanella 
O13. i cana IIs 65 34 4 nanella 
1642. Third Lamarckiana 60 25 Glee 
The offspring of two cana individuals of the second generation 
have been studied separately, as well as those of one specimen 0 
the Lamarckiana type. The plants have been under observation 
through their whole lifetime, so far as space allowed, the numbers 
of the flowering individuals being given in the column next to that 
of the totals. The cana were all of the same type; the Lamarckiana 
‘ exactly repeated the marks of the original species. Three of the 
dwarfs have flowered. They all had the marks of ordinary O. La- 
