OUTLINES OF BOTANY, > @.0.8 3.4 
common stalk upon which the leaflets are inserted is called the common 
raph: or the vergses “ie separate stalk of each leaflet * ¥ penne ule. 
Le or less marked by veins, which, om th 
ae pincers ae branch as the blade widens, and sprea as all or it more 
or less visibly. Th principal ones, w prominent, are often called ribs 
leaf is said to be reticulate or net-veined. When one principal vein 
runs direct from the stalk towards the summit of the leaf, it is called 
the midrib. When several start from the stalk, diverge ccna waitioet 
branching, and converge again towards the summit, they are s to be 
parallel, although not ‘athena tically so en 3 or 5 or more pee or 
nerves diverge from the base, the leaf is said to be 3-nerved, 5-nerved, etc., 
but if the lateral ones di syeres from the midrib a little above the base, 
the leaf is triplinerved, quintuplinerved, ete. The arrangement of the veins 
of a leaf is called their whee 
41. The ‘oat ets, ents, Lobes , Veins of leaves are 
pinnate Gaathared) ten there are several succeeding each other on 
each side of the midrib or petiole, compared to the branches of a feather. 
A pinnately lobed or divided leaf is called goer sie the terminal ait 
is much larger and broader ompar 
? 
by a stretch of imagination, to a lyre; ekesebiaes sae the lateral lobes 
are curved backwards towards the base of the leaf; aga when the 
lateral lobes are numerous, narrow, and regular, like the teeth of a comb. 
palmate or digitate, when sche diverge from the pe point, com- 
pared to the fingers of the 
nate, when three aon dass from the same point, in which case 
the distinction between the palmate and pinnate arrangement often ceases, 
a plants. £ f wi 
of a 
42. Leaves with pinnate, palmate, pedate, etc., leaflets, are paced rae 
shortness called pinnate, palmate, pedate, _ leaves. If they 
i hey are said t 
int 
pedatisect, etc., although the Lge rane segments a nd leaflets is 
often — - acpi ng cannot indeed always be ascertained. 
If the — only ‘aio lobes, they are said to be presen d, 
patmatfd Deastiad, * 
e teeth, obey segments, or leaflets, may 20 again toothed, lobed, 
d svi, - compounded. Some lea _ _ even three or more times ‘divided 
or seme In the “serene hey are Somed decompound. When 
ape innate (bi “Aiton OF x tripinnat) each primary or se econdary 
division, with the leaflets it mpri as eda —_- When the ee 
r the leaflets ta. a = ais ste In pairs out an odd te 
sett 3 Aeaflet, th e leaf or pinna so divided is pee = be abruptly pintesite: 
if t odd terminal pinna or leaflet, the leaf or pinna is unequally 
if there 
pinnate (¢ ceaiitghendte e). 
