108 THE FLOWERING PLANT. 
first developed, is termed the primine, the other being the 
secundine.} 
FIG. 49.—Diagram of a very simple flower in longitudinal section [from Sachs]. d, d. leaves 
of perianth cut off short; a. anther before dehiscence, cut across to show four pollen 
sacs; b. anther dehiscing longitudinally ; h, h. lobed stigmas upon which are pollen 
grains, 7, 7,7, developing pollen tubes; g. style traversed by a pollen tube, Jl; J, f. 
ovary containing a single inverted ovule; n. funicle; p, p. outer integument; q, q. 
inner integument; o. base of ovule; s, s. nucellus containing embryo sac, full of 
protoplasm with vacuoles, t, central nucleus, co-operating cells, v, egg-cell, z, and 
antipodal cells, wu; a pollen tube is seen entering the micropyle at m; e, e. nec- 
taries projecting from the receptacle. Vascular bundles indicated by dark lines. 
The ovule is termed (fig. 47) straight or orthotropous when 
nucellus and funicle (short in this case) are in the same straight 
1 These two terms are often employed in exactly the reverse way. 
