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cottonthorn, Tetradymia axillaris var. axillaris

cottonthorn, Tetradymia axillaris var. axillaris

cottonthorn, Tetradymia axillaris var. axillaris, California, White Mountains, McAfee Creek, Fishlake Valley drainage, elevation 1647 m (5405 ft).

The common name of this desert shrub refers to the dense cottony hairs on the young spines, which later shed their hairs. Anatomically the spines form from the primary leaves of the plant (true thorns come from branches instead). The green leaves that you see on the plant are actually secondary leaves that develop after the primaries.

Tetradymia axillaris is nearly endemic to the western and northern Mojave Desert of eastern California, southern Nevada, and southwest Utah below about 2300 meters (7550 feet) elevation. It extends only shortly into the surrounding mountains and Great Basin desert. The variety axillaris, characterized by its smooth green phyllaries, is even more restricted, found only in the northern Mojave - southern Great Basin transition zone of southern Nevada and adjacent California.

(plus d'infos...)

Photo prise @ Dyer le 30 avril 2017 (© Jim Morefield / Flickr)

Voir aussi :
 bishop, california, united states, asteraceae, sunflower family, tetradymia, tetradymia axillaris, tetradymia axillaris var. axillaris, angiosperm, dicot, plant, flowers, flower, blossom, bloom, wfgna, flora, wildflower, wildflowers, cnpsok
 

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