248 : BOTANICAL GAZETTE. [ October, 
Compared with other Asclepiads we have studied, this 
shows a few peculiarities which we may sum up: (1) The 
sucking another flower, wil] bring the pollen in contact with 
the stigma. In the case of Asclepias the most efficient VIS- 
Nor may suck the hoods without drawing out a pollinium, 
and, then, the chances of a particular pollinium being 10- 
serted are not many. Pollination is only fairly certain when 
ac 
a distinct plant 
One act of pollination supplies enough pollen to produce 
good fruit. Mr. Corry has observed that one pollinium 1s 
sufficient to fertilize a flower of Asclepias Cornuti.” 
_., ere are two ways bees have of treating loose pollen, = 
which the pollinia of Asclepiads are not liable: (1) ine 
| ne 
Trans. Linn, Soc Lond., Bot 2d, Ser., II, 196, This bears directly on wheats helt 
<orpuscul,. n, that the pollinia are inserted singly by the knees, and not in pai 
