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Image of San Diego wirelettuce
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San Diego Wirelettuce

Stephanomeria diegensis Gottlieb

Comments

provided by eFloras
The morphologic characteristics of Stephanomeria diegensis are a combination of those of S. exigua and S. virgata, and the species is thought to have evolved from genetic segregates of their hybridization (L. D. Gottlieb 1971; G. P. Gallez and Gottlieb 1982).
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Missouri Botanical Garden, 4344 Shaw Boulevard, St. Louis, MO, 63110 USA
bibliographic citation
Flora of North America Vol. 19: 351, 352, 353, 357 in eFloras.org, Missouri Botanical Garden. Accessed Nov 12, 2008.
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Flora of North America @ eFloras.org
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Flora of North America Editorial Committee
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Description

provided by eFloras
Annuals, 50–200 cm. Stems single, branches ascending or spreading, glabrous. Leaves withered at flowering (glabrous). basal blades linear to oblanceolate, runcinate. 3–10 cm, margins pinnately lobed. cauline much reduced, bractlike . Heads borne singly or clustered along branches . Peduncles 3–4 mm. Calyculi of reflexed bractlets. Involucres 7–9 mm (sparsely glandular-puberulent). Florets 11–13. Cypselae light tan to brown, 1.9–2.3 mm, faces smooth, slightly bumpy or tuberculate, grooved; pappi of 19–21, white bristles (falling), plumose on distal 80–85%. 2n = 16.
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. 19: 351, 352, 353, 357 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

Stephanomeria diegensis

provided by wikipedia EN

Stephanomeria diegensis is a species of flowering plant in the family Asteraceae known by the common name San Diego wirelettuce.[2] It is native to the coastal hills and ranges of southern California and Baja California, where it grows in many types of open habitat. It evolved as a hybrid of Stephanomeria exigua and S. virgata.[3] Furthermore, it is thought to be the result of homoploid hybrid speciation, which is uncommon.[4] The plant is frequently misidentified as one of its parents, especially if older taxonomic keys are used.[5] This is an erect annual herb easily exceeding two meters in height. Its slender stem has many spreading branches. The basal leaves are linear to lance-shaped and up to 10 centimeters long. The leaves wither early and are absent for most of the year, giving the plant a twiglike appearance. Leaves on the upper stem are small and reduced. The inflorescences are usually clusters of flower heads located at intervals on the stiff branches. Each head has a cylindrical base lined with phyllaries. These are often glandular. The head contains several ray florets, each with an elongated tube and a white or pink-tinged ligule measuring around a centimeter long. The fruit is a grooved achene tipped with a spreading cluster of long, plumelike pappus bristles.

References

  1. ^ "NatureServe Explorer 2.0".
  2. ^ USDA, NRCS (n.d.). "Stephanomeria diegensis". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 2 December 2015.
  3. ^ Gallez, G. P. and L. D. Gottlieb. (1982). Genetic evidence for the hybrid origin of the diploid plant Stephanomeria diegensis. Evolution 36:6 1158-67.
  4. ^ Sherman, N. A. & J. M. Burke. (2009). Population genetic analysis reveals a homoploid hybrid origin of Stephanomeria diegensis (Asteraceae). Mol Ecol 18:19 4049-60.
  5. ^ Chester, T. S. diegensis: An analysis

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Stephanomeria diegensis: Brief Summary

provided by wikipedia EN

Stephanomeria diegensis is a species of flowering plant in the family Asteraceae known by the common name San Diego wirelettuce. It is native to the coastal hills and ranges of southern California and Baja California, where it grows in many types of open habitat. It evolved as a hybrid of Stephanomeria exigua and S. virgata. Furthermore, it is thought to be the result of homoploid hybrid speciation, which is uncommon. The plant is frequently misidentified as one of its parents, especially if older taxonomic keys are used. This is an erect annual herb easily exceeding two meters in height. Its slender stem has many spreading branches. The basal leaves are linear to lance-shaped and up to 10 centimeters long. The leaves wither early and are absent for most of the year, giving the plant a twiglike appearance. Leaves on the upper stem are small and reduced. The inflorescences are usually clusters of flower heads located at intervals on the stiff branches. Each head has a cylindrical base lined with phyllaries. These are often glandular. The head contains several ray florets, each with an elongated tube and a white or pink-tinged ligule measuring around a centimeter long. The fruit is a grooved achene tipped with a spreading cluster of long, plumelike pappus bristles.

license
cc-by-sa-3.0
copyright
Wikipedia authors and editors
original
visit source
partner site
wikipedia EN