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1. Scabrethia scabra (Hooker) W. A. Weber, Phytologia. 85: 21. 1999.
Wyethia scabra Hooker, London J. Bot. 6: 245. 1847
Leaf blades mostly 8–20 cm × 5–20 (–25) mm. Phyllaries: bases ± rounded, apices acuminate or attenuate to linear or filiform. Ray laminae 15–50 mm. Cypselae 7–9 mm; pappi 0.01–0.5 mm. 2n = 38 (subspp. unknown).
Subspecies 3 (3 in the flora): w United States.
The subspecies of Scabrethia scabra evidently have evolved along with the dissection of the Colorado Plateau.
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| 1 |
Outer phyllaries: chartaceous bases ovate to oblong, 2–4(–6) mm, herbaceous tips attenuate to linear or filiform, 15–30+ mm, margins ± hispid (ciliate), faces glabrous or minutely gland-dotted |
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1c Scabrethia scabra subsp. attenuata |
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Outer phyllaries: chartaceous bases deltate to ovate, 2–5+ mm, herbaceous tips narrowly triangular to attenuate, 10–20 mm, margins (ciliolate or not) and faces minutely hispidulous to hirtellous or ± coarsely hispid |
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(2) |
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| 2 (1) |
Herbaceous tips of outer phyllaries usually spreading to recurved, margins (not ciliate) and faces minutely hispidulous to hirtellous |
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1b Scabrethia scabra subsp. canescens |
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Herbaceous tips of outer phyllaries usually ± erect to spreading, margins (± ciliate) and faces ± coarsely hispid |
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1a Scabrethia scabra subsp. scabra |
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