— 39 — 
praeterea — parce glandulosa pilis longioribus basi nigricantibus 
intermixtis; squamae lineari-lanceolatae, albo marginatae; ligulae 
luteae concolores. Floret ineunte Junio. 
Statio: Rasztowce pr. Skalat (Galiciae orientalis polonicae), 
in silvis, solo calcareo; in horto botanico Hauniensi ab anno 1889 
culta.” 
H. Zahn (1904, p. 171, note) says, that H. excellens is a 
subspecies of the H. umbelliferum N. & P. (= cymosum-magyaricum), 
i. e. belonging to a species which is supposed to have originated 
from a cross between H. cymosum (sectio Cymosina) and: A. 
magyaricum (sectio Praealtina), but that does not agree with 
Blocki’s statement above, that his A. excellens belongs to the 
section Praealtina. H. Dahlstedt of Stockholm who has seen 
dried specimens of the cultivated plant, writes that it “belongs to 
an intermediate group between Florentina and Glomerata”; it is 
also cultivated in the botanical garden, Bergielund, near Stock- 
holm. Whatever the systematie position of the plant in question 
may be, it is certain, that it is near H. magyaricum N. & P. (H. 
Bauhini Bess.), and that it has the same long epiterrean stolons, 
which mostly are only leaf-bearing, but sometimes turn out to bear 
a terminal corymb of flower-heads. For my purpose the most 
interesting point in the characters of the form is its aborted pollen. 
I have later found another species, H. roxolanicum Rehmann; 
growing in the Hieracium-plot in our Garden, in which also the 
anthers were quite empty, but hitherto I have used only H. excellens 
for my experiments, and in this summer (1906) H. roxolanicum 
has died. 
The experiments with H. excellens have been carried out in 
the following way: 
Series III (H. excellens x aurantiacum). 
In the first days of June 1904 a specimen was planted in a 
pot and placed in a window facing NE. June 15%; all the opened 
flower-heads were cut off; of the two remaining corymbs the one 
(A) was shut within a cylindrical glass and the opening was closed 
with wadding; before that some of the unopened flower-heads 
moreover had been castrated (No. 45), the others were intact (No. 44). 
June 16th—17t; the newly-opened flower-heads of the other corymb 
(B) were fertilized with the pollen of H. aurantiacum growing in the 
Medical Quarter of the Garden (No. 46); the flower-heads of H. 
