Family: Brassicaceae,
Mustard
Genus: Sisymbrium
Description
Plant height: 40-120 cm tall.
Growth habit:
erect annual, rather freely branched, from
taproot.
Stems:
with long, stiff, simple hairs, spreading to
backward-pointed, from sparsely to more densely hairy
below to hairless above.
 Leaves: alternate and in basal rosette, short-stalked,
the lower ones up to 15 cm long, broadly triangular- to
lance-shaped, with sharp, backward-pointed lobes, usually
with a large, sharply pointed, irregularly toothed, end lobe.
 Flowers: pale lemon yellow, in elongated clusters on
branches, up to 4 dm long in fruit, with 4 petals 6-8 mm
long and lance-shaped sepals about 3.5 mm long.
Flowering time: June-August.
 Fruits: pods linear, 20-35 mm long, and 0.7 mm thick,
cylindrical, mostly ascending, straight or slightly upward-
curved. Stalks thinner than pods, somewhat ascending,
7-20 mm long. Valves are rather prominently 3-nerved.
Seeds in 1 row, about 0.7 mm long, not slimy when wet.
Distribution
Common weed on disturbed ground in some parts of MT.
Introduced from Europe, now spread across N. America.
Medicinal plant: see below. |
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