1880.| Notes on the Flowering of Saxifraga sarmentosa. 571 
3. Of those stamens in pairs horizontally on the /ower side of 
each whorl, the stamen in each pair on the side of the /onger 
lower petal develops first. That is, if 
the longer petal is on the right side 
(facing as the flower), No. 5 will mature 
before No. 2, and No. 6 before No. 7, 
but contrariwise if the larger petal is jg) .4 
on the left side. No exceptions were 
found in thirty-one observations. 
4. Of those stamens in pairs horizon- 
tally, on the wpper side of each whorl, 
the stamen in each pair on the side of 
the shorter lower petal develops first. If yg. 2—S. sarmentosa (en- 
the longer is on the right side, No. 3 larged); stamén No. 9 in posi- 
matures before No. 4, and 8 before 10, er discharging poate 
and vice versa. In forty-two observations only two exceptions 
were noticed, and those where No. 8 preceded No. 10 contrary to 
rule, 
In a flower whose longer lower petal is on the right side, the 
stamens mature in the following order, I, 5, 2, 3, 4, 6, 7, 8, I0, 9 
—6 sometimes preceding 4; in one where it is on the left side, I, 
2,5, 4, 3, 7, 6, 10, 8, 9—7 sometimes preceding 3. 
5. The pistils very rarely reach maturity till, No.9 of the same 
flower has discharged pollen and withdrawn from position. 
Sometimes No. y becomes entangled with the nectar and is held 
in the position represented in Fig. 2 longer than the regular time. 
6. This brings us to the most remarkable fact of all, viz: che. 
automatic movements of the stamens. : 
The stamens, when immature, stand nearly at right angles with . 
Pg. 3-—Views of the right halves of two flowers of S, sarwsetiins ` a, staminate 
Stage; 4, stamen as before the pollen is discharged ; c, fo, alter, d, pistillate stage; a 
*, nectaries and immature pistils, 
the axis of the flower, but when mature they an (i. B hed 
Probably in 30-1 30 minutes, according to circumstances). c come 
