Annual herb with a long taproot 10 - 30 cm tall Stem: upright, branched above, with a waxy coating (glaucous). Flowers: in compact, branched clusters (racemes), which are borne terminally on the stems. Flower stalks to 4 mm long (longer in fruit). Sepals four, ascending, green with whitish margins, to 1.5 mm long, to 1 mm wide. Petals four, white, 2 - 3 mm long. Stamens six. Anthers yellow. Fruit: a pod (silicle), 4 - 7 mm long, egg-shaped with narrowed base and rounded tip, tips notched (wider than deep), winged. Fruit stalks horizontally spreading, to 6 mm long. Seeds two to four per chamber. Basal leaves: in a rosette, stalked, to 3 cm long, to 1.5 cm wide, egg-shaped or oblong or elliptic, coarsely toothed. Leaf stalks to 2 cm long. Stem leaves: alternate, stalkless, clasping, 1 - 3 cm long, progressively reduced, egg-shaped to oblong egg-shaped with rounded lobes at the base, sometimes coarsely toothed, with a waxy coating (glaucous).
Similar species: No information at this time.
Flowering: June to July
Habitat and ecology: Introduced from Eurasia. An uncommon weed of roadsides, railroads, waste ground, fields, and disturbed areas.
Occurence in the Chicago region: non-native
Etymology: Thlaspi is the Greek word for cress. Perfoliatum means "with the leaf surrounding the stem."
Author: The Morton Arboretum
From Flora of Indiana (1940) by Charles C. Deam
This species was found in 1924 by Miss Edna Banta of Brooksburg, Jefferson County, who reports it to be a frequent to common weed between Brooksburg and Madison, a distance of 8 miles, and in other places in the county. Reported also as occurring on the campus of the University of Notre Dame, St. Joseph County.
Indiana Coefficient of Conservatism: C = null, non-native
Annual 1-3 dm; cauline lvs sessile, ovate or ovate- oblong, 1-3 cm, entire or with a few teeth, the basal auricles blunt or rounded; pet 2-3 mm; mature pedicels horizontally spreading; frs obovate, 4-7 mm; convex below, the wing gradually widening to the summit, the wide open notch ca 0.5-1 mm deep and 1-2 mm wide; seeds smooth, 2-4 per locule; 2n=14, 28, 42, 70. Native of Eurasia, now found in fields, roadsides, and waste places here and there in our range. Apr., May.
Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp.