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Mojave Woodyaster

Xylorhiza tortifolia (Torr. & A. Gray) Greene

Description

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Subshrubs, 20–60(–80) cm. Stems branched mostly in proximal 3 / 4 , ± piloso-villous, stipitate-glandular. Leaf blades lanceolate to elliptic-oblong or oblanceolate, 3–20(–25) mm wide, bases often subclasping or sometimes attenuate and not clasping, margins flat, sharply spinulose-toothed, faces loosely villous or glabrous, stipitate-glandular. Peduncles 5–25 cm. Involucres 12–20 × 15–20(–30) mm. Ray florets (15–)18–60(–85); corollas usually lavender, seldom white. Style-branch appendages shorter than stigmatic lines.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 20: 404,407, 408, 409 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Synonym

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Haplopappus tortifolius Torrey & A. Gray, Boston J. Nat. Hist. 5: 109. 1845 (as Aplopappus); Machaeranthera tortifolia (Torrey & A. Gray) Cronquist & D. D. Keck
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cc-by-nc-sa-3.0
copyright
Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 20: 404,407, 408, 409 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
source
Flora of North America @ eFloras.org
editor
Flora of North America Editorial Committee
project
eFloras.org
original
visit source
partner site
eFloras

Xylorhiza tortifolia

provided by wikipedia EN

Xylorhiza tortifolia is a species of flowering plant in the aster family, known by the common names Mojave-aster and Mojave woodyaster.[1]

Distribution

The flowering plant is native to the Mojave Desert, Sonoran Desert, and Great Basin Desert ecoregions of the southwestern United States, California, and northwestern Mexico.[2]

It grows in arid canyons and bajadas/washes, from 240–2,000 metres (790–6,560 ft) in elevation. Habitats it is found in include creosote bush scrub, saltbush scrub, and Joshua tree woodlands.[1]

Description

Xylorhiza tortifolia is a perennial herb or subshrub with branching, hairy, glandular stems that reach 60–80 centimetres (24–31 in) in height/length. The leaves are linear, lance-shaped, or oval, with pointed or spiny tips and spiny edges. The leaf surfaces are hairy and glandular.

The inflorescence is a solitary flower head borne on a long peduncle. The head has a base with long, narrow phyllaries which may be over 2 centimeters long. The head contains up to 60 or more lavender, pale blue, or white ray florets which may be over 3 centimeters long. The bloom period is March through June.[1]

The fruit is an achene which may be over a centimeter long, including its pappus of bristles.

Varieties

  • Xylorhiza tortifolia var. imberbis — Imberis woodyaster, Great Basin region in Nevada, Utah, Arizona.[3]
  • Xylorhiza tortifolia var. parashantensis— Parashant woodyaster, endemic to Arizona.[4]
  • Xylorhiza tortifolia var. tortifolia — Mojave aster, Mojave woodyaster, a variety primarily native to the higher/winter colder Mojave Desert, and Owens Valley of the Great Basin region, from 240–2,000 metres (790–6,560 ft) in elevation.[5][6]

Taxonomy

Desert species of this aster with a woody base (Xylorhiza means woody base) are classified under the genus Xylorhiza, and have been removed from the large and complex genus Machaeranthera, where they were placed for many decades.[7] A similar species, Xylorhiza wrightii−Big Bend aster, is native to the Chihuahuan Desert in western Texas and northern Mexico.[7]

Uses

The Havasupai used the plant for incense and fragrance, with ground leaves carried in the clothes and used as perfume by men and women to counteract body odors.[8]

References

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Xylorhiza tortifolia: Brief Summary

provided by wikipedia EN

Xylorhiza tortifolia is a species of flowering plant in the aster family, known by the common names Mojave-aster and Mojave woodyaster.

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