Forest Trees of Texas: How to Know ThemMattoon, Wilbur R. (Wilbur Reed)
Science
Forest Trees of Texas: How to Know Them
Mattoon, Wilbur R. (Wilbur Reed)
Trees -- Identification; Trees -- Texas
The reddish-brown WOOD is soft, light, and coarse-grained.
PRAIRIE SUMAC (R. lanceolata [A. Gray] Britton) is found on the prairies
of eastern Texas to the valley of the Rio Grande, often forming thickets
on the banks of small streams. This species is distinguished by its
narrow, acute leaflets and its larger flowers and fruit.
POISON-SUMAC
Toxicodendron vernix (L.) Kountze
All parts of this beautiful plant give off toxic oils that may irritate
and blister the skin like the oils of poison ivy. Poison-sumac may grow
as a shrub with several clustered stems, or as a tree occasionally 25
feet high with a trunk 5 to 6 inches in diameter. The slender, smooth
branchlets are at first reddish-brown with orange-colored lenticels,
later becoming light gray and marked with elevated and conspicuous
leaf-scars.
[Illustration: POISON-SUMAC (Leaf, one-half natural size; fruit often
larger)]
The compound, alternate LEAVES are quite different from those of other
sumacs, shaped more like those of ash, for which reason it is often
called “poison ash.” The leaf-stems are always reddish, and usually
quite conspicuous. The leaves are 7 to 14 inches long, with 7 to 13
ovate-oblong leaflets, 3 to 4 inches long. The leaflets are bright green
above, paler beneath, usually with a red midrib.
The small FLOWERS are borne in panicles much less compact than those of
other sumacs. The FRUIT is a lustrous white drupe, born in slender,
drooping panicles. The fruit matures in September and is eaten by birds
and rabbits. The sap can be used to make a black, durable varnish.
AMERICAN HOLLY
Ilex opaca Ait.
American holly is found on rich, moist soils of bottomlands in East
Texas and westward to Wilson County. A tree often 50 feet high,
frequently attains heights of 80 to 100 feet and diameters up to 4 feet.
A large specimen may be seen at the Texas Forest Service’s Indian Mound
Nursery near Alto.
[Illustration: AMERICAN HOLLY (Leaf and fruit, two-thirds natural size)]
The BARK is light gray and roughened by wart-like growths. The numerous,
short, slender branches form a dense pyramidal head of striking dark
green color which is more pronounced when the conspicuous red drupes are
present.
The LEAVES are simple, alternate, rather oval, thick and leathery, 2 to
4 inches long and usually armed with spiny teeth. They remain on the
branches three years, dropping off in the spring.
The FLOWERS are small and whitish; male and female flowers are usually
borne on separate trees. The FRUIT, ripening late in the fall on the
trees bearing female flowers, is dull red or sometimes yellow, round or
somewhat oval-shaped berry-like drupe about ¼ inch in diameter and with
4 to 6 grooved, ribbed nutlets.
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