18 OUTLINE OF STRUCTURAL BOTANY 
The side veinlets all very short (Fig. 5) . . . +. ne Ur: 
The veinlets of the upper third exceed the others, which become 
gradually shorter above and below. 
The widest part is: 
About 4 the length, pear-shaped; inversely egg-shaped 
(Fig. 9) re re errr ee i tis ete ely |) OWRD TE 
About 4 the length, inversely eee (Fig. 10) 
ae ye ‘ Oblanceolate 
About 4 “that of ihe. leneth or less. spatula-formed 
Chis Jd). 1 . . . NSpatutate 
The lower veinlets nenaeude See Suny ard beyond the gen- 
eral outline or conspicuously backward, 
The apex sharp, the two sides of the base rounded. Heart- 
Shaped (Fig. 12) . - « Cordate 
The apex sharp, the eeneral ‘shape freneniar the two pos- 
terior triangular lobes pointing backward, not outward. 
Arrow-head-shaped (Fig. 18) . . . . « «~. Saguttaie 
General form triangular, but the lower nace of the leaf sud- 
denly widening into two lateral triangular lobes. Halberd- 
shaped. (hig 14) ee . « Hastate 
The leaf blade of various forms, ‘the posterior lobes pro- 
truding backward and inward. JHar-shaped (Fig. 16) 
. « » AUuniciionr 
The cancion veners ‘directed eae anit ipatew ard and then 
inward, the leaf blade enclosing the stem (Fig. 17) Perfoliate 
The veinlets of each of two opposite leaves projecting back- 
ward, the two leaf blades uniting around the stem (Tig. 
chs) aemupee ees - » Connate 
The middle veinlet ‘dhorter thar the width of ‘the leaf blade, 
the base heart-shaped. Kidney-formed” (fig. 15) . Reniform 
II 
There is a single principal vein, but the intervening tissue between 
the veinlets may be so irregularly developed as to give to the 
blade the appearance of haying been deeply cut into lobes and 
sinuses. Such forms are known as pinnated leaves. 
1. The tissue sharply cut between the veinlets about 4 way to 
the midvein. fFeather-cleft . . . . Pinnatifid 
A pinnatifid leaf with rounded lobes and sinuses like that of 
the White Oak (Fig. 29) . . . NSinuate 
With its lobes or segments pointing backw ard (F ig. - 81) Runcinate 
The terminal segment large, broad and rounded. JLyre- 
shaped (Fig. 30) . . Puree a ee 
2. The tissues between the veinlets cut out nearly to the midvein, 
the leaf is said to be (Fig. 82) . . . . . Pinnately Parted 
III 
Three or more principal veins radiate from the leaf stem and trav- 
erse the leaf blade. . .. . . 6 « « « «+ Palmate veined 
