A Handbook of Some South Indian Grasses — John Shaqi
A Handbook of Some South Indian GrassesRangachari, K.
Science
A Handbook of Some South Indian Grasses
Rangachari, K.
Grasses -- India, South; Plants -- India, South
The stem consists of =nodes= and =internodes=. The internodes are
cylindrical and somewhat flattened on the side towards the axillary bud.
When young they are completely covered by the leaves and the older ones
have only their lower portions covered by the leaf-sheaths. Usually they
complete their growth in length very soon, but the lower portion of the
internode, just above the node and enclosed by the sheath, retains its
power of growth for some time.
The leaf consists of the two parts, the =leaf-sheath= and the
=leaf-blade=. At the junction of these two parts there is a very thin
narrow membrane with fine hairs on its free margin. This is called the
=ligule=. (See fig. 2.)
The leaf-sheath is attached at its base to the node and it is slightly
swollen just above the place of insertion. It covers the internode, one
margin being inside and the other outside. The surface of the sheath is
sparsely covered with long hairs springing from small tubercles. The
outer margin of the sheath bears fine hairs all along its length. (See
fig. 2.)
The leaf-blade is broadly lanceolate, with a tip finely drawn out. Its
base is rounded and the margin wavy, especially so towards the base. On
the margin towards the base long hairs are seen, and some of these arise
from small tubercles. The margin has a hyaline border which is very
minutely serrate. There is a distinct midrib and, on holding the leaf
against the light, four or five small veins come in to view. In the
spaces between these veins lie many fine veins. All the veins run
parallel from the base to the apex. At the base of the blade the veins
get into the leaf-sheath and therefore the sheath becomes striated. Just
above the ligule and at the base of the leaf-blade there is a colourless
narrow zone. This is called the =collar=.
[Illustration: Fig. 2.--Leaf of Panicum javanicum.
A. Full leaf; B. a portion of the leaf showing 1. the ligule and 2. the
collar.]
As already stated the inflorescences appear at the free ends of
branches. Every branch sooner or later terminates in an inflorescence
which is a compound raceme. There are usually five or six racemes in the
inflorescence. Each raceme has an axis, called the =rachis=, which bears
unilaterally two rows of bud-like bodies. These bud-like bodies are the
units of the inflorescence and they are called =spikelets=. (See fig.
3.)
[Illustration: Fig. 3.--The inflorescence of Panicum javanicum.
1. Inflorescence; 2 and 3. the front and the back view of a raceme.]
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