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Desert Polygala

Rhinotropis acanthoclada (A. Gray) J. R. Abbott

Comprehensive Description

provided by North American Flora
Polygala acanthoclada A. Gray, Proc. Am Acad. 11: 73. 1876.
Stems intricately divergent-branched, 1.2-9 dm. high, densely and usually canescently spreading-pilosulous, in age subglabrate, the branchlets indurate and spiny-tipped; leaves spatulate or linear-spatulate, 6-17 mm. long, 1-2.5 mm. wide, rounded or obtuse, coriaceous, reticulate-venose, ciliolate and spreading-puberulous ; racemes terminating branchlets or axillary, loosely 3-4-flowered, 2-10 mm. long, the axis usually spiny-tipped; bracts subulate to elliptic, 1.5-3 mm. long; pedicels pilosulous or glabrous, 3.3-5 mm. long; flowers yellowish, the upper petals sometimes purplish-tipped; sepals ovate, spreading-puberulous, 2-3.2 mm. long; wings obovate or oval, rounded, obscurely mucronulate, rounded at base, glabrous, 3.8-5 mm. long, 2.5-3 mm. wide; keel not beaked, merely bluntly convex below apex, subtruncate, glabrous, 3.3-3.5 mm. long; capsule oval, 4.5-4.8 mm. long; seed sparsely pilose, with short curved rostrum, 3.8 mm. long; aril attached to apex of beak, 1 mm. long, the 2 cuneate-obovate lobes scarious, appressed.
Type locality: San Juan Valley, Colorado.
Distribution: Southwestern Colorado to southwestern Nevada, San Bernardino County, California, and northern Arizona.
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bibliographic citation
John Kunkel Small, Lenda Tracy Hanks, Nathaniel Lord Britton. 1907. GERANIALES, GERANIACEAE, OXALIDACEAE, LINACEAE, ERYTHROXYLACEAE. North American flora. vol 25(1). New York Botanical Garden, New York, NY
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Rhinotropis acanthoclada

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Rhinotropis acanthoclada, synonym Polygala acanthoclada,[1] is a species of flowering plant in the milkwort family known by the common names desert polygala and thorn milkwort.[2] It is native to the desert woodlands of the southwestern United States from Utah to the Mojave Desert. It is a small, bushy shrub spreading or growing erect and approaching one meter in maximum height. It is hairy in texture, the youngest twigs hairiest with a feltlike coat of short, whitish fibers. The lance-shaped or oval leaves are up to 2.5 centimeters long. Some of the twigs narrow to spines at the tips, especially in the inflorescences. The flowers are solitary or in clusters of up to 15. Each flower has five sepals, the lateral two white in color and spreading out like wings. The middle petal is keeled, with a flat tip protruding. The fruit is a capsule about half a centimeter long.

References

  1. ^ a b c "Rhinotropis acanthoclada (A.Gray) J.R.Abbott". Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2020-04-13.
  2. ^ Polygala acanthoclada. NatureServe. 2012.

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Rhinotropis acanthoclada: Brief Summary

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Rhinotropis acanthoclada, synonym Polygala acanthoclada, is a species of flowering plant in the milkwort family known by the common names desert polygala and thorn milkwort. It is native to the desert woodlands of the southwestern United States from Utah to the Mojave Desert. It is a small, bushy shrub spreading or growing erect and approaching one meter in maximum height. It is hairy in texture, the youngest twigs hairiest with a feltlike coat of short, whitish fibers. The lance-shaped or oval leaves are up to 2.5 centimeters long. Some of the twigs narrow to spines at the tips, especially in the inflorescences. The flowers are solitary or in clusters of up to 15. Each flower has five sepals, the lateral two white in color and spreading out like wings. The middle petal is keeled, with a flat tip protruding. The fruit is a capsule about half a centimeter long.

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