— 942 — 
than those of AH. excellens, and they have a darker hairiness; the 
corollas are somewhat deeper yellow and the outer ones bear 
the red stripe on the underside; the flowers are purely female. 
Taken as a whole the hybrid origin is certain enough, but the 
characters are unquestionably nearer H. excellens. Ripe fruits after 
castration (No. 112) and after isolation (No. 145) have germinated, 
but sparingly; at present there are 8 young plants. 
Series V (H. excellens x pilosella). 
Another specimen of H. excellens, planted in a pot, was placed 
in the same cold-house as mentioned above. June 16th 1904; all 
the opened flower-heads were removed. June 17; six heads, now 
open, were fertilized with H. pilosella, taken from the lawn near 
the Observatory (No. 50). Harvest, sowing and planting as in the 
foregoing series. From fruits from the crossed heads 15 plants 
grew; 8 were pure H. excellens, but two of them (No. 50,9 and 
50,10) first flowered in 1906. Among the other specimens one 
certain hybrid did not flower in 1905 and has died in the winter 
(No. 50,7). Only one plant (No. 50,4) is hermaphrodite, the other — 
hybrids are all female like their mother, perhaps with exception 
of one, which flowered so early in 1905 that I did not happen to 
examine it, and which has not flowered in 1906. The female 
hybrids (Nos. 50,1, 50,2, 50,3 and 50,s) are nearly alike: the 
vegetative parts are strong in all respects, the flower-heads are 
somewhat larger than those of H. excellens, but much smaller than 
those of H. pilosella; the heads are arranged in corymbs, usually 
richer than the figured one (Plate I, fig. 6), which is a rather 
slender specimen of No. 50,3, taken late in autumn of 1905. The 
undersides of the leaves bear a poor covering of stellate hairs, but 
do not get the whitish aspect of those of H. pilosella. Generally 
speaking the hybrids are nearer to H. excellens than to H. pilosella. 
Offspring of some of them are now in the Garden, but will first 
flower next year; the figured plant has given rise to two plants 
after castration (No. 147), and others are produced from not-isolated 
fruits of the same plant (No. 120) and of another, No. 50,2 (No. 
117). The fruiting-power is rather small; during the second flowering 
in 1905 two castrated heads of the hermaphrodite specimen (No. 50, 4) 
gave no full fruits; five castrated heads of the female No. 50,3 
gave 15 full and 142 barren fruits, while isolated heads of the 
same plant gave 7 full and 350 barren fruits. 
The experiments have at present reached this point, but when 
