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Title: Plant Guide: Limestone hawksbeard: Crepis intermedia

Author: St. John, L.; Tilley, D.;

Date: 2012

Source: Aberdeen, ID: U.S. Department of Agriculture, National Resources Conservation Service, Aberdeen Plant Materials Center. 3 p.

Publication Series: Other

Description: Sunflower family (Asteraceae). Limestone hawksbeard is a native perennial forb with one or two stems arising from a taproot. Plants are 30-70cm tall and basal leaves are 10-40 cm long, pinnatifid, with a fairly broad, undivided midstrip and entire or dentate segments. Plants are densely or sparsely gray-tomentulose. There are 10-60 heads per plant that are 7-12 flowered. The involucre is 10-12 mm high, tomentulose-puberulent, and the outer bracts are less than half as long as the mostly 7or 8 outer ones. The corollas are yellow, 14-30 mm long and the achenes are 5.5-9 mm long, mostly yellow or brownish with dusky white hairs 7-10 mm long. Limestone hawksbeard is wholly apomictic and polyploid. Chromosome number is 2n=33, 44, 55, 88 which reflects the existence of polyploidy races within the species (Cronquist, et al., 1994; Flora of North America).

Keywords: limestone hawksbeard, Crepis intermedia, native, forb

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St. John, L.; Tilley, D. 2012. Plant Guide: Limestone hawksbeard: Crepis intermedia. Aberdeen, ID: U.S. Department of Agriculture, National Resources Conservation Service, Aberdeen Plant Materials Center. 3 p.


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