Pharmaceutical botany - Lighthouse Survival Blog
Pharmaceutical botany - Lighthouse Survival Blog
Pharmaceutical botany - Lighthouse Survival Blog
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(2) Periblem, forming the cortex; and<br />
HERB AND TREE 21<br />
(3) Plerome, forming the fibrovascular elements.<br />
Duration of Steins.— Herbaceous, dying down to the ground at<br />
the dose of the season.<br />
Annual, an herb whose life terminates with the season.<br />
Biennial, where the stem dies at the end of the first season, the<br />
underground parts perfecting themselves and retaining their vitality<br />
to the next season, when seeds are produced and the plant dies<br />
completely.<br />
Perennial, when the underground parts retain their vitality<br />
indefinitely.<br />
Above-ground Stems.— -A twining stem winds around a support,<br />
as the stem of a bean or Morning Glory.<br />
A CULM is a jointed stem of the Grasses and Sedges.<br />
A climbing or scandent stem grows upward by attaching itself<br />
to some support by means of aerial rootlets, tendrils or petioles.<br />
The SCAPE is a stem rising from the ground and bearing flowers<br />
but no leaves, as the dandelion, violet, or blood root.<br />
A tendril is a modification of some special organ, as of a leaf<br />
stipule or branch, capable of coiling spirally and used by a plant in<br />
climbing. Present in the Grape, Pea, etc.<br />
A SPINE or thorn is the indurated termination of a stem tapering to<br />
a point, as the thorns of the Honey Locust.<br />
Prickles are outgrowths of the bark only and are seen in the roses.<br />
A stolon is a prostrate branch, the end of which, on coming in con-<br />
tact with the soil, takes root, so giving rise to a new plant. Ex. : Cur-<br />
rant and Raspberry.<br />
An undershrub or suffruitcose stem is a stem of small size and<br />
woody only at the base.<br />
A shrubby or fruitcose stem is a woody stem larger than the pre-<br />
ceding and freely branching near the ground.<br />
Herb and Tree<br />
A tree is a perennial woody plant of considerable size (20 ft. or more<br />
in height) and having as the above-ground parts a trunk and a crown of<br />
leafy branches.<br />
An herb is a plant whose stem does not become woody and perma-<br />
nent, but dies, at least down to the ground, after flowering.<br />
3