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FNA | Family List | FNA Vol. 19, 20 and 21 | Asteraceae | Cirsium

54f. Cirsium scariosum Nuttall var. toiyabense D. J. Keil, Sida. 21: 216. 2004.

Toiyabe thistle

Plants erect, subacaulescent to caulescent, 5–55 cm. Stems usually simple, leafy, glabrous to villous or tomentose with septate trichomes, sometimes thinly arachnoid tomentose. Leaves: blades oblong to oblanceolate or elliptic, pinnately lobed or often unlobed, longer spines less than 1 cm, abaxial faces green and ± glabrous to white-tomentose, adaxial faces green, glabrous or villous with septate trichomes. Heads 1–10+, sessile or short-pedunculate, crowded at stem tips, usually subtended and ± overtopped by distal leaves. Involucres 2–3 cm. Phyllaries: outer and mid lanceolate to ovate, spines slender, 2–4 mm; apices of inner acuminate and entire or abruptly expanded into scarious, erose-toothed appendages. Corollas rose-purple, 23–31 mm, tubes 11–16 mm, throats 4.5–8.5 mm, lobes 5.5–8.5 mm; style tips 3.5–4.5 mm. Cypselae 4–6 mm; pappi 22–25 mm.

Flowering spring–summer (May–Aug). Meadows, pastures, springs; 1250–2300 m; Idaho, Nev., Oreg.

Variety toiyabense occurs in the western Basin and Range province from northern Nevada to southeastern Oregon and southwestern Idaho.


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