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Related article: The rhizomes and stipes of Dryopteris filix-mas and Dryopteris mar-
ginalis are official in the U. S. P. The fibro-vascular bundles of
these are concentric in type but differ from the concentric fibro-
vascular bundles of some monocotyledons in that xylem is inner-
most and phloem surrounds the xylem.
FIG. 159. Cyrtomyim falcalum. Under (dorsal) surface of a portion of a
sporophyll, showing the numerous sori on the pinnae. (Gager.)
ORDER 2. HYDROPTERALES OR WATER FERNS
(HETEROSPOROUS)
Family Sahiniacea. Floating ferns with broad floating leaves and
submerged dissected leaves which bear sporocarps. Examples: Sal-
mnia and Azolla.
DIVISION IV. SPERMATOPHYTA (PHANEROGAMIA)
Plants producing real flowers and seeds. The highest evolved
division of the vegetable kingdom.
SUBDIVISION I. GYMNOSPERM^: THE GYMNOSPERMS
The Gymnosperms comprise an ancient and historic group of seed
plants which were more numerous in the Triassic and Carboniferous
TAXONOMY
293
periods than now. They differ from the Angiosperms in several
respects, viz.: they bear naked ovules on the edges or flat surfaces
of leaves called carpels, while Angiosperms bear covered ones; each
megaspore produces within itself a bulky prothallus, in the upper
portion of which originate one or more archegonia, while in Angio-
sperms no recognizable prothallus has been proven to exist; the
stored food tissue within their seeds is prothallial tissue loaded with
starch, etc., while that in Angiosperm seeds (endosperm) is developed
from the endosperm nucleus; the mode of growth of their stems is
always indefinite while that of Angiosperms is either indefinite or
definite.
FIG. 160. Cycas revoluta, showing terminal bud of foliage-leaves just opening.
(Gager.)
The groups still extant are the Cycads or Fern Palms, the Gne-
tums, the Ephedras, the Ginkgos and the Conifers. Of these the
Conifers comprising over 300 species are the most numerous. Many
of them yield valuable products to pharmacy and the arts.
The Conifers include the pines, spruces, hemlocks, cedars, firs,
arbor vitae, chamaecyparis, and larches. All of their number are
evergreen except the larches, which drop their foliage upon the
advent of winter.
294
PHARMACEUTICAL BOTANY
I. Order Coniferales. Trees with a single upright stem which
develops side branches that spread out horizontally and taper to a
point at the summit, giving the crown of the tree the appearance of
a huge cone, rarely shrubs.
Pinacea (Conifera) or Pine Family. Trees or shrubs with resin-
ous juice whose wood is Purchase Cephalexin characterized by being composed largely of
tracheids with bordered pits. Leaves entire, awl- or needle-shaped
frequently fascicled, exstipulate, usually evergreen. Flowers,
monoecious or rarely dioecious, achlamydeous, in cones. Staminate
PIG. 161. Inflorescences of the pine, i, Terminal twig; 2, ovulate cone; 3,
staminate cone; 4, two-year-old cone. (Hamaker.)
cone of Purchase Cephalexin a large number of microsporophylls (stamens) closely packed
together and arranged spirally around a central axis, each stamen Purchase Cephalexin
bearing usually two pollen sacs. Carpellate cone composed of
spirally Purchase Cephalexin arranged scales, each of which bears a pair of naked ovules
(megasori) near the base of Purchase Cephalexin its upper face, or, ovules springing from a
cupuliform disc. Fruit a Purchase Cephalexin cone with woody or fleshy scales (Pinus,
Thuja, Abies, Picea, etc.), a galbalus (Juniperus) or a drupe com-
posed of the thickened and fleshy disc surrounding an erect seed
(Taxus). Seeds albuminous. Embryo with two or more cotyledons .
TAXONOMY
295
Official drug Part used
Terebinthina N.F. Concrete oleoresin
Resina
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