Difference between revisions of "Cirsium scariosum var. thorneae"
Great Basin Naturalist 42: 201. 1982.
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|tribe=Asteraceae tribe Cardueae | |tribe=Asteraceae tribe Cardueae | ||
|genus=Cirsium | |genus=Cirsium |
Revision as of 21:15, 16 December 2019
Plants erect, caulescent (rarely nearly acaulescent), 20–130 cm. Stems distally short-branched to openly much-branched throughout, leafy, glabrous or villous with septate trichomes. Leaves: blades oblong, oblanceolate, or narrowly elliptic, usually pinnately lobed more than halfway to midveins, abaxial faces glabrous or gray-tomentose, adaxial glabrous; distal usually deeply divided, fiercely armed with stout spines, the longer 1–3 cm. Heads 1–10+, sessile or pedunculate, solitary or crowded near tip of main stem or branches, usually subtended and ± overtopped by distal leaves. Involucres (broadly ovoid to hemispheric) 2.5–3.5 cm. Phyllaries: outer and mid lanceolate to narrowly ovate, spines slender to stout, 2–8 mm; apices of inner usually abruptly expanded into scarious, erose-toothed appendages. Corollas white to dull purple, 29–34 mm, tubes 14–18 mm, throats 6.5–9 mm, lobes 7–8.5 mm; style tips 5–6.5 mm. Cypselae 4.5–5 mm; pappi 20–27 mm.
Phenology: Flowering summer (Jun–Sep).
Habitat: Meadows, streamsides, valley bottoms, often in saline soils
Elevation: 1500–2200 m
Distribution
![V19-154-distribution-map.gif](/w/images/b/b2/V19-154-distribution-map.gif)
Colo., Idaho, Nev., Utah.
Discussion
Variety thorneae grows mostly in the Basin and Range province of Utah with populations in eastern Nevada, southern Idaho, and western Colorado.
Selected References
None.