Overview

Distribution

National Distribution

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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National Distribution

United States

Origin: Native

Regularity: Regularly occurring

Currently: Present

Confidence: Confident

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Conservation

Conservation Status

National NatureServe Conservation Status

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: T4 - Apparently Secure

Reasons: Occurs from San Luis Obispo County, California south to the Sierra Juarez of Baja California, Mexico, on dry hillsides and talus slopes; frequent in San Diego County, scattered in Santa Barbara County, but complete distribution and abundance unknown.

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National NatureServe Conservation Status

United States

Rounded National Status Rank: N3 - Vulnerable

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NatureServe Conservation Status

Rounded Global Status Rank: G4 - Apparently Secure

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Wikipedia

Dudleya pulverulenta

Dudleya pulverulenta is a succulent plant known by the common names chalk lettuce, chalk dudleya, and chalk liveforever.

Distribution[edit]

This dudleya is native to the southwestern United States and northern Mexico, where it is found in steep open rocky areas in coastal and inland mountains and desert foothills, such as the Santa Monica Mountains.

Description[edit]

Dudleya pulverulenta grows a rosette of wide, flat fleshy leaves of pale green which age to a pinkish papery texture. It produces one to many tall erect stems which are similar in color. The epidermis of the plant is covered with a dense coating of chalky, powdery "wax". Its pale green or white nodding or erect inflorescences bear many pinkish flowers, each on a long pedicel. [1]

D. pulverulenta is similar in appearance to Dudleya brittonii.

Habitat[edit]

The plant tolerates full sun exposure or part shade. It is susceptible to aphid infestations which result in flower and rosette deformities. Openly hybridizes with several other species. Plant appears to have very good cold tolerance when mature and has survive temperatures of 18 degrees F in a local garden with no ill effects. Higher temperatures are also tolerated well by Dudleya with the white chalky and mealy "wax" coatings, which reflect light and prevent evaporation.[citation needed]

Plants are very rapid recolonizers as evidenced by proliferation on roadcuts shortly after development. A much hardier plant for the garden environment than the more commonly available Dudleya brittoni.

Unusual "wax" coating[edit]

Leaves grow in a basal rosette and are covered with a dusty, chalky, mealy white epicuticular “wax”, as are the flower stalk and flowers. Although wax is usually categorized as a hydrophobic substance, this plant’s epicuticular wax (waxy leaf coating on the surface of leaves), when drops of water land on the Dudleya pulverulenta leaves, the “wax” is attracted to the water droplets, and rises and coats the drops on the leaves, increasing the apparent surface tension of the droplets so that they are much larger than uncoated drops of water, and then it prevents evaporation of the coated drops. When the drops dry, the evaporate is thin and smooth and no longer mealy.[citation needed] “Wax” that has washed off the leaves also coats the ground around the base of the plant, further preventing evaporation.

References[edit]

  1. ^ Dudleya and Hassenthaus Handbook, Paul Thompson 1993
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Names and Taxonomy

Taxonomy

Comments: As treated by Kartesz (1994 checklist), Dudleya pulverulenta is a species known only from California and Baja California; the plants from Arizona, California, Nevada, Sonora, and Utah sometimes classified as D. pulverulenta var. arizonica are treated by Kartesz as a distinct species, Dudleya arizonica. Kartesz intends to combine these, treating them as subspecies, in his next edition (1/98 review draft).

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