266 Small— Irritability of the Pollen-presentation 
Genus and Species. 
Place of 
Observation. 
Type of 
Irritability 
Remarks. 
X Scorzonera hispanica, L. 
K.R.B.G. 
C 
slow but very dis- 
tinct (3) 
Scorzonera purpurea, L. 
K.R.B.G. 
C 
slow but clear (3) 
Senecio adonidifolius, Loisel. 
K.R.B.G. 
c 
distinct 
X Senecio aquaticus, Hill 
F. 
B 
‘ A ’ distinct, ‘ B ’ 
slight 
Senecio bellidioides, Hook. f. 
E.R.B.G. 
C 
distinct 
Senecio (hortensis) 
K.R.B.G. 
C 
marked (10) 
X Senecio Jacobaea, L. 
F. 
C 
‘ A ’ distinct, ‘ C ’ 
slight 
Senecio Ledebouri, Sch. Bip. 
K.R.B.G. 
A 
slight 
Senecio Ligularia, Hook. f. 
K.R.B.G. 
A 
slight 
Senecio Ligularia, Hook, f., v. speciosa K.R.B.G. 
C 
slight and slow 
X Senecio palustris, Hook, 
E.R.B.G. 
C 
distinct 
Senecio populifolius, DC. 
E.R.B.G. 
C 
marked (1 1) 
X Senecio squalidus, L. 
K.R.B.G. 
C 
distinct 
Senecio tropaeolifolius, Mac 0 wan 
E.R.B.G. 
C 
distinct 
X Silybum Marianum, Gaertn. 
C.U.B.G. 
C 
distinct (12) 
X Solidago serotina, Ait. 
F. 
C 
distinct 
X Solidago Virgaurea, L. 
F. 
C 
slight 
X Sonchus asper, L. 
F. 
C 
distinct (3) 
X Sonchus oleraceus, L. 
F, 
C 
slightbut distinct(3) 
X Tanacetum vulgare, L. 
E.R.B.G. 
A 
distinct (16) 
X Taraxacum officinale, Weber 
F, 
C 
distinct (3) (17) 
Tragopogon orientalis, L. 
K.R.B.G, 
C 
slow (3) 
Ursinia cakilefolia, DC. 
K.R.B.G, 
A 
distinct 
Ursinia pulchra, N. E. Br. 
A.C.G. 
C 
distinct but variable 
Ursinia speciosa, DC. 
A.C.G, 
Notes. 
B 
‘ A ’ distinct, ‘ B ' 
slight 
(1) Helipterum roseum and Calendula officinalis are recorded by 
Juel (4) as not irritable, but it must be borne in mind that these show the 
‘ A ’ type only, and that species which are irritable in these latitudes may 
not show that character farther north. Chrysocoma Coma-aurea and 
Ammobium alatum are recorded as irritable by Juel but with a ?. 
(2) In Beilis perennis the movement is sometimes slight, and at other 
times it has been observed to split the anther tube against the comparatively 
thick and rigid style. The anther tube is frequently quite loose around the 
style, and the movement can be seen clearly to be due to the stamens and 
not to any movement of the style. 
(3) The lateral movement in the Cichorieae is slow, and the presenta- 
