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Mecca Woodyaster

Xylorhiza cognata (H. M. Hall) T. J. Watson

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Xylorhiza cognata is known only from Riverside County.
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 20: 406,407 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Description

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Shrubs, 50–150 cm. Stems branched to near apices, glabrescent (younger stems and branches stipitate-glandular). Leaf blades spatulate to ovate, 3–20 mm wide, bases attenuate, subclasping, margins flat, coarsely spinulose-toothed, faces glabrous, sparsely stipitate-glandular. Peduncles 5–11(–20) cm. Involucres 15–20 × 20–40 mm. Phyllaries loosely appressed, outermost (at least margins) stipitate-glandular, innermost shorter than mid. Ray florets (12–)20–29(–32); corollas light blue to violet. Style-branch appendages shorter than stigmatic lines. 2n = 12.
license
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: 406,407 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

Synonym

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Aster cognatus H. M. Hall, Univ. Calif. Publ. Bot. 6: 173. 1915; Machaeranthera cognata (H. M. Hall) Cronquist & D. D. Keck
license
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: 406,407 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 cognata

provided by wikipedia EN

Xylorhiza cognata is a rare species of flowering plant in the family Asteraceae known by the common names Mecca-aster and Mecca woodyaster.[2][3]

Distribution

The shrub is endemic to the Colorado Desert within southern California, in Riverside County and Imperial County.[2] Most known populations are in the Mecca Hills and Indio Hills, located on the southeast side of the Coachella Valley and northeast of the Salton Sea.[2][4][1]

It grows in arid canyons and bajadas/washes, below 400 metres (1,300 ft) within creosote bush scrub habitats of the Californian and northwestern Colorado Desert sub-region of the Sonoran Desert ecoregion of North America.[2]

Description

Xylorhiza cognata is a woody subshrub with branching stems that may approach 1.5 metres (4.9 ft) in height. They are hairy and glandular when new and lose their hairs with age. The leaves are lance-shaped to oval with smooth, toothed, or spiny 'holly-like' edges.[5]

The inflorescence is a solitary flower head with up to 30 or more pale lavender to pale violet rays surrounding a yellow central disk. Each petal may measure over 2 centimeters in length. The flowering period is January to June.[5]

The fruit is an achene which may be over a centimeter long, including its pappus of bristles.[5]

Conservation

Xylorhiza cognata is a listed Endangered species on the California Native Plant Society Inventory of Rare and Endangered Plants. Threats to this species include recreational off-road and other vehicles, and potential property development projects.[4]

References

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Xylorhiza cognata: Brief Summary

provided by wikipedia EN

Xylorhiza cognata is a rare species of flowering plant in the family Asteraceae known by the common names Mecca-aster and Mecca woodyaster.

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