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Associations

provided by BioImages, the virtual fieldguide, UK
Foodplant / gall
larva of Ceutorhynchus assimilis causes gall of live root of Lepidium draba ssp. draba
Remarks: season: 3-

Foodplant / feeds on
larva of Ceutorhynchus turbatus feeds on Lepidium draba ssp. draba

In Great Britain and/or Ireland:
Plant / resting place / within
puparium of Chromatomyia horticola may be found in leaf-mine (end of) of Lepidium draba ssp. draba

Foodplant / parasite
Erysiphe cruciferarum parasitises live Lepidium draba ssp. draba

Foodplant / spot causer
colony of Pseudocercosporella anamorph of Mycosphaerella capsellae causes spots on live leaf of Lepidium draba ssp. draba

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Lepidium draba

provided by wikipedia EN

Lepidium draba, the whitetop or hoary cress,[1] or Thanet cress,[2] is a rhizomatous perennial flowering plant in the family Brassicaceae. It is native to western Asia and southeastern Europe and widely introduced elsewhere.

Description

Whitetop

Whitetop is a perennial herb that reproduces by seeds and by horizontal creeping roots. The stem is stoutish, erect or spreading, 10 to 80 cm tall, branched, covered sparsely with ash-colored soft hairs to heavily covered. The leaves are alternating, simple, and mostly toothed. The basal leaves are 4 to 10 cm, have a slight stem (petiole), and are long and flat, lance-shaped to egg-shaped, with the narrow end attached to the stalk. On the upper part of the stem the leaves are attached directly to the stalk (sessile), are 2 to 6.5 cm long, and are oblong or tapering the point, with broad bases that clasp the stalk. Whitetop has slightly domed flower clusters in which the individual flower stalks grow upward from various points off the branch to approximately the same height (corymb-like). The petals are white, clawed, and 3 to 5 mm long, about twice the length of the sepals.

Distribution

It is native to western Asia and southeastern Europe and is an invasive species in North America, introduced by contaminated seeds in the early 1900s. Also known as Cardaria draba, hoary cress is a weed in much of south-east and south-west Australia as well.[3]

Distribution in United States

Cardaria-draba-distribution-USDA.png

References

  1. ^ BSBI List 2007 (xls). Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-06-26. Retrieved 2014-10-17.
  2. ^ W Bond; G Davies; R Turner. "The biology and non-chemical control of Hoary Cress (Cardaria draba (L.) Desv.)" (PDF). Gardenorganic.org.uk. Retrieved 22 March 2022.
  3. ^ "Hoary Cress". Weed Identification & Information. Australian Weeds Committee. Archived from the original on 2015-04-14. Retrieved 2015-04-12.

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Lepidium draba: Brief Summary

provided by wikipedia EN

Lepidium draba, the whitetop or hoary cress, or Thanet cress, is a rhizomatous perennial flowering plant in the family Brassicaceae. It is native to western Asia and southeastern Europe and widely introduced elsewhere.

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cc-by-sa-3.0
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Wikipedia authors and editors
original
visit source
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wikipedia EN