Ontario Weeds: Creeping yellow cress
Excerpt from Publication 505, Ontario Weeds, Order this publication
Table of Contents
- Other Names
- General Description
- Stems and Roots
- Flowers and Fruit
- Similar Species
- Related Links
Stems & Roots: Spreading or ascending
10-60cm (4-24in.) high, simple to freely branched;
Leaves: Thin and pinnately parted almost to midrib, lanceolate in outline, with toothed or cut divisions that are lanceolate or linear; lower leaves up to 20cm (8in.) long, upper ones progressively reduced;
Flowers & Fruit: Flowers in small clusters at ends of branches; the clusters expanding into elongated, open racemes as the flowers mature; each flower 3-10mm (1/8-2/5in.) wide, with 4 bright yellow petals longer than the 4 sepals; seedpods (siliques) slenderly linear-cylindric, 2-15mm (1/12-3/5in.) long and 0.4-1.5mm (1/50-1/16in.) wide; their pedicels 3-20mm (1/8-4/5in.) long, thread-like and spreading perpendicular to the stem; seeds 0.6-0.8mm (1/40-1/30in.) long. Many patches of Creeping yellow cress do not set seed and their seedpods remain undeveloped. Flowers from June to September.
Habitat: Creeping yellow cress was introduced from Eurasia and is found throughout southern Ontario in moist soil in river beds, along sand dunes, wet meadows and in depressional areas in fields and gardens.
Similar Species: It is distinguished by its perennial habit of growth often resulting in dense patches with numerous intertwining rhizomes, its petals being much longer than its sepals, its lateral leaf segments often being sharply toothed and more widely spaced than in Marsh yellow cress, and the frequent absence of seed set.
For more information:
Toll Free: 1-877-424-1300