dwarf snapdragon_chaeorrhinum minus
No other photos at this time.
Roots: The roots are tap roots, but
are not very long and they often have other roots branching off of them
Stems/Leaves: The stem is about
4 inches to 12 inches tall, branching often. The stem is narrow
and round and covered with white hairs. The leaves are about 1
inch long and about 1/6 of an
inch wide. The leaves are also ciliate and smooth The
start to grow
at the bottom of the plant and grow up-ward from there (2).
Flower: The flower consist of
five sepals, five petals, and four stamens in unequal pairs. The
stigma is often "head-shaped." The flower has an arching two lobed
upper lip, and a three lobed lower lip. The outer flower and
overall color is purple. The overall flower shape
resembles the toadflax and the full sized snap dragon. The flower
color can range from a lilac and white with a yellow throat to mainly
white with a purple stipe through out the lower lip (3,9,10).
Fruits and Seeds: The
fruit is a capsule, and each capsule produces 40 to 60 dark brown
Methods of reproduction: When
the flower bud seeds fall out after they are ripened the wind carries
them off until the seed falls (5).
Life style/habits and life duration:
The dwarf snap dragon is an annul herb and they are often found around
rail road tracks and highways. It does not tolerate shade and
lives for about 5 years before it is out competed by near-by
Environment favorable for infestation:
Dwarf snapdragons are often found along rail road tracks, roads, and
dry creek beds. They can also be found in dry gravely soil
Methods of control:
Non Chemical: you are able to pull these weeds out of the
ground or you can mow them over with your lawn mower, they have a very
shallow tap root, so they are easy to pull (7).
Chemical: the plants are
easy to spray (8) .
1) Arnold, R. M. 1991. Dwarf Snapdragon
-The Railroad Weed. Weed Technology. Vol. 5:467-8.
2) Arnold, R. M.
1982. Floral Biology of Chaenorrhinum minus (Scrophulariaceae)
a Self-compatible Annual. The American Midland Naturalist. 108(2). Pp.
3) McGregor, R. L.
(Editor) 1986. Flora of the Great Plains. University Press of Kansas.
4) Muenscher, W.C.
1980. Weeds. Cornell University Press. Ithaca and London. Pp. 391-2.
5) Roche’ C. 1991.
Dwarf snapdragon. Pacific Northwest Extension Publication. WSU
Cooperative Extension. PNW378.
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