Inflorescence is terminal and wider than it is tall. Other Names: heart-podded hoary cress, pepperweed, whitetop USDA Code: CADR Contact the USDA-ARS The stems, in the rosette stage, may grow up to 2 inches in height and produce grayish-green leaves that are lance shaped. For this article, whitetop will refer to the three species: globe-podded hoary cress and lens-podded hoary cress, alongside heart-podded hoary cress. Appearance Lepidium draba is a perennial forb in the mustard family that can grow up to 2 ft. (0.6 m) tall. Accidentally introduced to North America from western Asia and eastern Europe as a seed contaminant, hoary cress currently infests more than a quarter million acres of public and private land and is found on the noxious weed lists of 14 states and one Canadian province. Control. If there are hairs on the leaves, they are simple (not stellate or Sidney, MT 59270, Northern Plains 3. oary cress (Cardaria draba), commonly known as whitetop, is a creeping perennial that is a member of the mustard family and native to Europe. Northern Plains Dig or pull individual plants for small infestations; remaining roots can produce new plants. The Strategy: This noxious weed occurs sporadically throughout the valley. Control of hoary cress is very difficult because of an extensive root system that can grow up to 50 new plants from one lateral rhizome. Selected Weeds of the United States Agriculture Research Service United States Department of Agriculture, Washington, DC, p. 200, Learn how and when to remove this template message, https://www.gardenorganic.org.uk/sites/www.gardenorganic.org.uk/files/organic-weeds/cardaria-draba.pdf, United States National Agricultural Library, https://en.wikipedia.org/w/index.php?title=Lepidium_draba&oldid=976730623, Articles needing additional references from May 2016, All articles needing additional references, Creative Commons Attribution-ShareAlike License, This page was last edited on 4 September 2020, at 17:13. Hoary cress (also called whitetop) is native to the Balkan Peninsula and southwest Asia. In: Fire Effects Information System. repens (lens-podded hoary cress). It is also seen by Sylvan Lake on Laney Brothers Road. 5. Mountain thistle • Mechanical removal should cut roots below soil Common name(s): Whitetop, Hoary cress Scientific name: Lepidium draba Family: Mustard family (Brassicaceae) Reasons for concern: This plant forms dense monocultures, which displace native plant species and reduce biodiversity, wildlife habitat, and forage production.Its very extensive root system makes it very difficult to control once it has become established. Hoary cress can look Hoary Cress. like other Lepidium, but they differ mostly by having flat fruit Hoary cress whitetop Lepidium draba USDA symbol: LEDR ODA rating: B Other common names: Hoary cress, whiteweed, peppergrass, heart-podded, hoary cardaria Introduction: Whitetop is native to southwest Asia. Life cycle Primarily a winter annual.. Growth habit. Identification & Control. General. Invasions are often composed of dense patches, and it is unclear whether clonal growth via horizontal roots or seedling recruitment is the … Hoary Cress. Upper leaves clasp around the stem where it divides into two lobe-like segments. Other Names: Perennial peppergrass, whitetop, whiteweed, heart-podded hoary cress. (3.7-7.6 cm) long with fine hairs and heart-shaped bases. Hoary cress (Cardaria draba or Lepidium draba) is a creeping-spreading perennial from Eurasia that grows up to 2 feet tall. Hoary Cress. Hoary cress is in the mustard family: Brassicaceae (or Cruciferae- the old name) The family is characterized by four petals (rarely 0 petals) that are white or yellow, and 6 anthers (rarely 2 or 4), with four of them longer Integrated Taxonomic Information System. Colorado is seeing a dramatic increase in noxious weeds. Contact us with questions or to report. Leaves are entire Three species occur in New Mexico: lens-podded hoary cress (C. chalapensis), heart-podded hoary cress (C. draba), and globe-podded hoary cress (C. pubescens); heart-podded is most common. How do you know if white or yellow, and 6 anthers (rarely 2 or 4), with four of them longer This non-native plant can grow as high as two feet. with fruit on it and the collection location to: John The Brassicaceae has DESCRIPTION: Hoary cress is a perennial that grows up to 3 feet tall. 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. The petals are white, clawed, and 3 to 5 mm long, about twice the length of the sepals. to let the seeds out. systematics of the Lepidium draba and the 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). Also known as Cardaria draba, hoary cress is a weed in much of south-east and south-west Australia as well. Zouhar, K. 2004. Agricultural Research Laboratory for more information. 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