270 BOTANICAL GAZETTE [OCTOBER 
hybrids with other species; but the characters are not always as 
sharp as in the instances described, or the production of seeds is 
too insufficient for further cultures. Only one case may still be 
mentioned here. It was a mutant from O. lata, discovered in 1914, 
the self-fertilized seeds of which gave a dimorphic second gen- 
eration, consisting of 19 plants of the parental type, 47 of the 
Lamarckiana type, besides 2 mut. oblonga and 2 mut. /ata. Almost 
all of these flowered in 1915. Those of the parental type were 
strikingly like one another, constituting a wholly new form, with 
very long, narrow, dark green leaves, the stems low and scarcely 
branching, the spikes rich with bright flowers like those of Lamarck- 
zana, and with a good supply of pollen. The fruits, however, were 
cylindrical and very thin, containing only a few good seeds. The 
plants excelled in beauty the species and most of its other mutants, 
but on account of its slight fertility I do not propose to continue 
the culture. It may be called O. superflua. 
O. biennis Chicago mut. saligna.—In the second generation of 
my race of O. biennis Chicago” I found in 1913, among 870 normal 
individuals, two specimens of a weaker, narrow-leaved type, which 
differed sufficiently from the former mutants of this species, 
namely, from O. biennis Chicago mut. salicifolia and mut. sali- 
castrum,™ to be considered a new form. One of these new mutants 
died before flowering, the other yielded, after self-fertilization, 
a small but sufficient harvest of seeds. One-half of these seeds 
were sown, but only 17 specimens germinated and grew up into 
flowering plants. Of these 9 repeated the type of the parent, but 
8 returned to the size, vigor, and characters of O. biennis Chicago, 
the grandparent. Although the numbers are very small, they 
point to a splitting into equal parts, as in the splitting mutants 
of O. Lamarckiana just described. 
The difference was already evident in March, when the seed- 
lings were only two months old. In June the rosettes were large, 
but smaller than those of the species, the leaves smooth and narrow. 
The stems grew up to about one-half the height of their atavistic 
sisters, and began to flower in September, having a length of 60-120 
x Gruppenweise Artbildung, pp. 34, 52, etc. 1913. 
* Gruppenweise Artbildung, p. 304. figs. rr0, r11. 
