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Sequoiadendron giganteum

Sequoiadendron giganteum
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Product Information
Specification

Scientific name: Sequoiadendron giganteum  (Lindley) J.Buchholz  1939

Synonyms:Americus gigantea (Lindl.) Hanford, Americus giganteus (Lindl.) Hanford, William H., Gigantabies wellingtoniana (Seem.) J.Nelson, Sequoia gigantea (Lindl.) Decne., Sequoia washingtoniana Sudw., Sequoia wellingtonia Seem., Steinhauera gigantea (Lindl.) Kuntze ex Voss, Taxodium giganteum (Lindl.) Kellogg & Behr, Taxodium washingtonianum Winslow, Washingtonia americana Gordon,  Washingtonia californica Winslow, Washingtonia gigantea (Lindl.) Carrière, Wellingtonia californica Sarg., Wellingtonia gigantea Lindl., Wellingtonia pendula Briolay-Goiffon ex Carrière

Common names: Bigtree, Giant sequoia, Sequoia, Sierra redwood, Wellingtonia

 

Description

Tree to 90 m tall, with trunk to 11 m in diameter, flaring broadly and buttressed at the base at maturity, often fluted to the base of the crown. Bark bright to dark reddish brown, even in extreme old age, to 60 cm thick. Crown composed of a few major trunklike limbs and numerous horizontal branches, densely conical when young (for 100 years or more!), becoming oblong with age as the lower branches die. Twigs completely clothed by the attached leaf bases and partly hidden by the free tips. Leaves bluish green, with a stomatal band on each outer face and scattered stomates on the inner face, living 5-7 years or more, the free tip 3-8(-15) mm long. Pollen cones 4-8 mm long, remaining green for several years after ripening until the seeds are released. External face of each cone scale 15-30 mm wide and 5-10(-15) mm high. Seeds 3-6 mm long, about half as wide, including the wings.

Restricted to California in the Sierra Nevada from Placer County to Tulare County (with the vast majority of the trees in Tulare County and adjacent Fresno County south of the Kings River). Forming groves on valley flats in montane mixed coniferous forest at (900-)1,800-2,300(-2,700) m.

 

Conservation Status

Red List Category & Criteria: Endangered

(Despite the fact that almost all existing ‘groves’ of Sequoiadendron giganteum are in protected areas and some have been protected for more than a century, the population is in continuous decline. The actual area of occupancy, estimated to be 142 km2, falls well below the threshold for Endangered (500 km²) and with a continuing decline due to inadequate regeneration and natural death of (over)mature trees, which are being replaced by other, competing conifers, the B2 criterion applies and the species meets the criteria for listing as Endangered)

 

References

Farjon, A. (2010). A Handbook of the World's Conifers. Koninklijke Brill, Leiden.

Eckenwalder, J.E. (2009) Conifers of the World: The Complete Reference. Timber Press, Portland.

IUCN Red List of Threatened Species, International Union for Conservation of Nature and Natural Resources. Cambridge, UK /Gland, Switzerland

 

Copyright © Aljos Farjon, James E. Eckenwalder, IUCN, Conifers Garden. All rights reserved.

Product CodeSEQQ26TK94
Propagation0.0000


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