414 BOTANICAL GAZETTE [NOVEMBER 
wanting in A. chrysantha. The time of flowering is intermediate between 
that of the two parents; the plants were in full flower by: the second half 
of May. The flowers are much broader than those of A. desertorum, 
with relatively short spurs (that is, in relation to the breadth), which is 
not a character of either parent. The sepals are strongly divergent, 
a character of A. chrysantha. The following description is from a char- 
acteristic flower. 
Flower nodding. Sepals about 19 mm. long and 8 mm. broad, pink, 
with a faintly purplish shade, or the apex distinctly purplish. Petals 
30 mm. long (to end of spur), 8 mm. wide near apex, broadly truncate 
and sub-marginate apically; apical 1o mm. cream color, spur rose-pink; 
spurs much broader basally than in A. desertorum. 
Two plants, representing each parent as seed-producer, are essentially 
alike; but a third, recorded as from A. chrysantha pollen on A. desertorum, 
is distinctly different, having longer spurs (petals 34 mm., the truncate 
apex 7mm. wide), and longer, narrower sepals (21 mm. long, 6 mm. 
wide), while the color of the spurs is more purplish, owing to less acidity. 
It is just possible that this represents A. caerulea pollen on A. desertorum, 
due to some unobserved insect, although the heads were covered and the 
records do not indicate any such cross as having purposely been made. 
Thus it appears that the color of the flowers and the time of flowering 
of the F, hybrid are clearly intermediate; but the form of the flowers 
departs from both parents in the direction of the A. vulgaris group. The 
form of the flower, however, may be given a simple Mendelian inter- 
pretation, if we say that the dominant characters are the spur-length 
of desertorum and the flower-width of chrysantha. 
We also have a row of A. chrysanthaXA. caerulea hybrids, but this 
form has long been known in gardens. It blooms with A. caerulea, and 
has the flowers paler than A. caerulea, with the white replaced by light 
yellow, which fades to white as the flowers grow old. On the whole, it 
is nearly A. caerulea, with the yellow of A. chrysantha superimposed 
upon it.—T. D. A. CockERELL, Boulder, Colorado. 
AN ALTERNARIA ON SONCHUS 
(WITH ONE FIGURE) 
During recent studies on Alternaria and Macrosporium much 
material was sent to me by various botanists. Among this was an 
Alternaria collected by Dr. Davis near Madison, Wisconsin, which 
