390 BOTANICAL GAZETTE [aca y 
second type. The velutina began to flower about a week after the 
laeta. In August the height was 1. 50-1 .80 m., and the resemblance 
of the two types to O. (biennis x Lamarckiana) laeta and velutina 
was very striking, although the plants, as would be expected, were 
less stout. The flower buds of the velutina were thick, as usual, 
measuring 9X25 mm., as compared with 730 mm. for those of 
laeta. The free tips of the calyx were distant in the first, but 
pressed against one another in the second hybrid. The incision 
at the top of the petals was deep in the velutina, but slight in the 
laeta. The first were more hairy in all parts, especially on the 
flower buds and the younger parts of the axis of the spike. Their 
leaves were narrow, kennel-shaped, and smooth. The apex of the 
spike above the flowers was more densely covered by flower buds, 
but that of the Jaeta more loose, as shown in fig. 4. In all these 
respects the differences were the same as those between the twins 
of O. biennts X Lamarckiana. 
I fertilized a Jaeta and a velutina and had in 1916 a progeny of 
63 and 7o plants respectively, most of which flowered. The off- 
spring of the /aeta contained two mutants, an ochracea and a lorea; 
that of the velutina one, a sulfurea, with the same pale yellow petals 
as in O. biennis mut. sulfurea. Besides these, each of the cultures 
was uniform, resembling the parent in all respects. The differences 
were apparent in the boxes in May, at the time of planting out. 
O. syrticola XO. grandiflora.—O. syrticola Bartlett is the O. murt- 
cata of my Gruppenweise Artbildung. I made two crosses in 1913, 
crossing each plant with the pollen of one individual of O. grandi- 
flora, as usual. The figures for both cultures are given separately 
in table III; one of them was grown in 1914, but the other in 1915. 
From the first I had a second generation for each of the twins in 
1915 and a third in 1916. They were uniform and resembled their 
parents. The size of these cultures was 4 and 49 for the /aeta, but 
61 and 70 for the velutina, which had given a better harvest. One 
mutant was observed among the velutina of 1915, having linear 
leaves and remaining very weak; apart from this the cultures were 
strikingly uniform, with the same differences as in the first genera- 
tion and almost the same as those between the twins of O. syrti- 
cola X Lamarckiana. ~ 
