1910] BLODGETT—BULBS OF ERYTHRONIUM 361 
summer and develops into the full-sized bulb during the active 
period of the aerial shoot at the base of which it lies. Starch for 
storage is derived both from the photosynthesis of the leaves 
- and from the deposits in the old bulb within which the new bulb 
: 
| 
| 
| | wi 
| 
a, | 
cae |: +42 
+ Al 
43 
44 
5 
6 
_ inches deep. 
Fic, 6 .—Stages in life cycle of E. americanum: under natural conditions the third 
bulb may repeat “ise ey, gaining little in depth, “ renewed in situ for 
one or more seaso: 
As formed. By the time the aerial shoot is dead, the new bulb 
is mature, and the apical dome within it lays down the rudiments 
of the next flower. This process is repeated indefinitely, the 
