Comments
provided by eFloras
Rare and restricted to the Cottonwood, Funeral, Grapevine, and Panamint ranges of Death Valley National Park, Inyo County, Eriogonum intrafractum is one of the more remarkable species of the genus. The tall, simple, glabrous stem is branched only near the top, and then with only two to five inflorescence branches. The small leaves are restricted to the base of the plant. The lower part of the stem, when dried, fragments into napkinring-like segments. The rings have no evident value to the species, as they are not capable of vegetative reproduction. Some parenchyma cells at the fracture points are large enough to be seen with the naked eye, and it is likely that they act as compression points. Much as the intervertebral disks in the vertebral column provide a degree of flexibility, so too may these large parenchyma cells allow the top-heavy flowering stem to move in the wind without breaking. The flowers are numerous, each involucre so filled with more than a hundred flowers that it is torn apart by late anthesis.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
provided by eFloras
Herbs, 6-15 × 0.3-0.9 dm, grayish. Aerial flowering stems 5-12 dm, disarticulating into ringlike segments 3-10(-16) mm. Leaves: petiole 3-8 cm, pilose; blade oblong-ovate, 2.5-7 × 0.7-2(-3) cm, pilose on both surfaces, margins entire. Inflorescences 1-3 × 2-6 cm; bracts scalelike distally, triangular, and 1-3 mm, semileaflike proximally, oblong, and 3-6 mm. Involucres 2.5-3.5 × 3-5 mm, pilose; teeth 0.5-2 mm. Flowers 1.5-3 mm; tepals: those of outer whorl oblanceolate, 0.9-1.2 mm wide, those of inner whorl broadly oblanceolate to fan-shaped, 1-1.5 mm wide; stamens 0.8-1.5 mm. Achenes 2-2.5 mm. 2n = 40.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Habitat
provided by eFloras
Limestone washes, slopes, and cliffs, saltbush and creosote bush communities, juniper woodlands; of conservation concern; (600-)800-1600m.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Eriogonum intrafractum: Brief Summary
provided by wikipedia EN
Eriogonum intrafractum is a species of wild buckwheat known by the common names jointed buckwheat and napkinring. This plant is endemic to Inyo County, California, where it is known only from the mountain ranges surrounding Death Valley. It is an uncommon, distinctive perennial herb which grows in scattered patches on rocky limestone soils in these desert mountains.
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