244 MR. I. H. BURKILL ON SOME YARIATIONS IN 
TaBLE XXII. 
Number of Stamens in Flowers of Sagittaria montevidensis 
according to Position on Axis. 
No. of flowers. Jo. of s. “of stam one 
in a flower. 
Lowest whorl ......... | 5 192 98:4 
2nd 5 eee | 6 198 32:17 
Brd M | 7 209 29:86 
Ath s ssec | 9 277 30°78 
Bh yy see | 6 186 310 
6th EM | 5 151 3017 
"th HEN | 5 143 28:6 
Bth A | 5 137 274 
9th VEMM 5 135 27-0 
10th Wu | 4 114 28:5 
Uth 4 ee | 4 108 270 
SUMMARY. 
In this paper are given the results of the examination of 
nearly 5700 flowers of Stellaria media, Cyr., of upwards of 800 
flowers of Ranunculus Ficaria, Linn., and of smaller numbers 
of several other plants, i. e.:—Caltha palustris, Linn. (102), 
Ranunculus arvensis, Linn. (104), R. bulbosus, Linn. (66), TAalic- 
trum flavum, Linn. (242), Bocconia cordata, Willd. (57), Prunus 
Padus, Linn. (199), P. Lauro-Cerasus, Linn. (108), Crategus Oxya- 
cantha, Linn. (227), Rosa canina, Linn. (24), Quercus Ilex, Linn. 
(282), and Sagittaria montevidensis, Cham. (60)—numbers in 
themselves absolutely insufficient to establish any fact other 
than that the plants do vary; but yet worthy of consideration, 
inasmuch as they support the main contention of this paper, that 
the position of the flower on the axis affects the sexual organs, 
if they vary. We have seen how the earlier-formed flowers 
on the plant carry more stamens or more carpels, or perhaps more 
