82 
James Small. 
Inflorescence. Solitary axillary flowers occur in a number of 
genera; simple and corymbose racemes are common. The tendency 
of the corymb to form a racemose umbel develops in various 
species of Siphocampylus, including lautanifolius (Pig. 53), microstoma , 
corymbiferus , gracilis , aggregatus, and reticulatus, and also in 
Jasione and Phyteuma of the Campanuloideae (cp. also Campanula 
glomerata). A dense, short corymb which is a close approach to 
a capitulum occurs in Lobelia corymbosa. The inflorescence of 
Centropogon densijlorus varies from a short raceme almost to a 
racemose umbel, and the more umbellate it is the more flowers are 
ebracteolate. This occurs in a number of other species of the genus. 
Figs. 53-55. Inflorescence etc. of Siphocampylus. 
Fig. 53, S. lautanifolius, complete inflorescence ; 54, S. asfer, portion of 
raceme ; 55, 5. exitnus , portion of raceme (after Planchon). 
Bracts. The general tendency throughout the tribe is the 
same as in Centropogon : the closer the inflorescence approaches an 
umbel the fewer and more reduced are the inner bracts. This 
reduction of the bracts in Siphocampylus is more or less correlated 
with the reduction of the calyx (cp. Figs. 53-55). Even in the 
simple racemes there is a tendency for the upper bracts to disappear, 
as in S. angustifolius and S. jlagclliformis. 
Involucre. In the cases where the inner or upper bracts are 
reduced or even completely absent, the outer or lower bracts 
usually remain more or less foliaceous (cp. Fig. 53), although they 
