444 
STRUCTURE AND LIFE HISTORIES 
ist year 
zd year 
3d year 
4th year 
5th year 
5 seeds 
5 seeds 
5 seeds 
5 seeds 
5 seeds 
5 plumule- 
5 plumule- 
5 plumule- 
5 plumule- 
bulbs 
bulbs 
bulbs 
bulbs 
5 yearlings 
5 yearlings 
5 yearlings 
15 two years 
15 two years 
old 
old 
45 flowers 
397. Annual Bulbs. At the base of an old flowering 
bulb, and in the axil of one of the bud-scales, there de- 
FIG. 329. Diagram of life-cycle of an angiosperm (Alisma Plantago- 
aquatica). 9, female gametophyte (embryo-sac); 8c and ga, male gameto- 
phyte (pollen-grain). (After J. H. Schaffner.) 
velops each year an annual bulb, which attains full size 
about April, and begins in May to form the bud for the 
leaves and flowers of next spring. 
