Difference between revisions of "Pleiacanthus"
Fl. Rocky Mts., 1069. 1917.
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|common_names=Thorny skeletonweed | |common_names=Thorny skeletonweed | ||
| − | |basionyms={{Treatment/ID/ | + | |basionyms={{Treatment/ID/Basionym |
|name=Lygodesmia | |name=Lygodesmia | ||
|authority=D. Don subgen. Pleiacanthus Nuttall | |authority=D. Don subgen. Pleiacanthus Nuttall | ||
| + | |publication_title=Trans. Amer. Philos. Soc., n. s. | ||
| + | |publication_place=7: 444. 1841 | ||
}} | }} | ||
|synonyms= | |synonyms= | ||
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|publication year=1917 | |publication year=1917 | ||
|special status= | |special status= | ||
| − | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/ | + | |source xml=https://jpend@bitbucket.org/aafc-mbb/fna-data-curation.git/src/f6b125a955440c0872999024f038d74684f65921/coarse_grained_fna_xml/V19-20-21/V19_572.xml |
|tribe=Asteraceae tribe Cichorieae | |tribe=Asteraceae tribe Cichorieae | ||
|genus=Pleiacanthus | |genus=Pleiacanthus | ||
Revision as of 18:37, 24 September 2019
Perennials, 10–50 cm; root crowns woody, branched. Stems 1–4[–8], branches divaricate, rigid, spine-tipped, with conspicuous tufts of light brown, wool in axils of bud scales at and just below ground level, otherwise glabrous (bud scales lanceolate, 8–30 × 5–8 mm, entire). Leaves cauline; sessile; proximal blades linear, margins entire; distal bractlike. Heads (± subsessile, erect), borne singly or in paniculiform arrays. Peduncles not inflated, not bracteate. Calyculi of 4–6 bractlets (unequal, lengths to 1/2 phyllaries). Involucres cylindric, 2–3+ mm diam. Phyllaries 3–5 in ±1 series, linear-lanceolate. Receptacles flat or convex, smooth, glabrous, epaleate. Florets 3–5; corollas pink or lavender. Cypselae tan, columnar, apices truncate (beaks 0), with 5 equal faces, separated by weakly rounded ribs, each face with central, narrow, shallow, longitudinal groove, glabrous; pappi persistent, of 50–60, distinct, light tan, barbellate bristles (of 2 lengths). x = 8.
Distribution
w United States
Discussion
Species 1.
Selected References
None.