Comments
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eFloras tarafından sağlandı
Lasthenia burkei is known only from relatively few populations in the coast ranges north of San Francisco Bay. It is allopatric from other members of Lasthenia sect. Ornduffia. It is in the Center for Plant Conservation’s National Collection of Endangered Plants.
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- Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
Description
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İngilizce
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eFloras tarafından sağlandı
Annuals, to 30 cm. Stems erect, branched distally, hairy. Leaves linear, 10–50 × 1–2+ mm (simple blades or single lobes), margins entire or pinnately lobed, faces glabrous or ± hairy. Involucres hemispheric or obconic, 4–6 mm. Phyllaries 7–16 (distinct), ovate, hairy. Receptacles conic or dome-shaped, muriculate, glabrous or hairy. Ray florets 8–13; laminae oblong to oval, to 6 mm. Anther appendages linear to ± ovate. Cypselae black or gray, clavate, to 1.5 mm, hairy; pappi usually of 1(–2) aristate scales plus 3–6+ shorter, ± subulate scales. 2n = 12.
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Synonym
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İngilizce
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eFloras tarafından sağlandı
Baeria burkei Greene, Bull. Calif. Acad. Sci. 2: 151. 1887
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Lasthenia burkei
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İngilizce
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wikipedia EN tarafından sağlandı
Lasthenia burkei is a rare species of flowering plant in the family Asteraceae known by the common names Burke's goldfields and Burke's baeria.
Distribution
The plant is endemic to California, where it is known from three counties north of the San Francisco Bay Area. It grows in moist spring meadows and vernal pools.
Critically endangered plant
This is a listed endangered species on the federal level in the United States and the state level in California. It is listed as Critically Imperiled—Critically endangered by NatureServe.
There are probably fewer than ten occurrences in Lake, Mendocino, and Sonoma Counties.[1] It is threatened by the destruction and degradation of its rare wetland habitat, and it may be extinct by 2025.[1]
Description
Lasthenia burkei is an erect annual herb producing hairy stems with sparse linear or deeply divided, narrow, pointed leaves a few centimeters long.
Atop the stem is an inflorescence, which is a flower head with a base of hairy phyllaries. The head contains many yellow disc florets surrounded by a fringe of several short ray florets, which are usually also yellow.
The fruit is a hairy, club-shaped achene less than 2 millimeters long.
References
Media related to Lasthenia burkei at Wikimedia Commons
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Lasthenia burkei: Brief Summary
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wikipedia EN tarafından sağlandı
Lasthenia burkei is a rare species of flowering plant in the family Asteraceae known by the common names Burke's goldfields and Burke's baeria.
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Lasthenia burkei
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Vietnamca
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wikipedia VI tarafından sağlandı
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Lasthenia burkei: Brief Summary
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Vietnamca
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wikipedia VI tarafından sağlandı
Lasthenia burkei là một loài thực vật có hoa trong họ Cúc. Loài này được (Greene) Greene mô tả khoa học đầu tiên năm 1894.
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Media related to Lasthenia burkei at Wikimedia Commons 
