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Related article: of the plant the following season when it flowers, fruits and dies. .
3. Perennial plants live indefinitely, as trees.
Root Histology. Monocotyledons. The histology of mono-
cotyledonous roots varies, depending upon relations to their sur-
roundings, which may be aquatic, semi-aquatic, mesophytic, or
xerophytic. Bactrim 800 In this connection we will discuss only the type of
greatest pharmacognic importance, i.e., -the mesophytic type as
seen in its most typical form in the transverse section of Honduras
Examining such a section from -periphery toward the center, one
notes the following:
i. Epidermis of a single layer of cells many of which give rise to
2. Hypodermis of two or three layers of cells whose walls are
3. Cortex, consisting of a broad zone of parenchyma cells many
of which contain starch grains.
4. Endodermis of one layer of endodermal cells whose walls are
extremely thickened through the infiltration of suberin and lignin.
5. Pericambium of one or two layers of meristematic cells whose
walls are extremely thin.
6. A radial fibro-vascular bundle of many alternating xylem and
phloem patches and hence poly arch. The phloem tissue consists
of phloem cells and sieve tubes. The xylem is composed of xylem
cells, tracheae and wood fibers.
7. Medulla or pith composed of parenchyma cells containing starch
and often showing xylem patches cut off and enclosed within it.
PLANT ORGANS AND ORGANISMS
Dicotyledons. The typical dicotyl root is a tetrarch one, four
xylem alternating with four phloem patches. These roots have an
unlimited power of growth.
p m t en
PIG. 59. Part of a transverse section of Honduras sarsaparilla root showing
epidermis (e), root hair (ha), hypodermis (h), cortex (c), rendodemis (en), peri-
cambium (p), trachea of one of the numerous xylem patches (/), and pith (m).
The phloem patches are the small oval cellular areas wedged in between the outer
portions of adjacent xylem masses. (Photomicrograph.)
A. Of Primary Growth.
A transverse section of a dicotyl root in its Bactrim 800 young growth shows
the following structure from periphery toward center:
i. Epidermis with cutinized outer walls, the cells often elongating
to form root-hairs.
3. Primary cortex with usually small intercellular spaces.
4. Endodermis, or innermost layer of cells of the cortex* with
lenticularly thickened radial walls.
f , 5. Pericambium of one to two layers
of actively growing cells which may
produce side rootlets.
6. Radial fibro-vascular bundle of
four, rarely two or three or five or six
phloem patches alternating with as
many xylem arms. Not uncommon to
find bast or phloem fiber along outer
face of each phltfem patch. Xylem
has Bactrim 800 spiral tracheae, internal to these a
few pitted vessels, then, as root ages,
more pitted vessels, also xylem cells
and wood fibers make their appearance.
7. Pith, a small zone of parenchyma
B. Of Secondary Growth (Most official
At about six weeks one notes cells
dividing by tangential walls in Bactrim 800 the inner
curve of phloem patches. This is in-
trafascicular cambium. Bactrim 800 A single layer
of flattened cells starts to cut off on
elusive; g, primary xylem bun- its inner side a quantity of secondary
xylem and pushes out the patches of
bast fibers, adds a little secondary
phloem on the outer side. Secondary
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