Phytologia 85: 21. 1999.
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).
Ariz., Colo., N.Mex., Utah, Wyo.
Subspecies 3 (3 in the flora).
The subspecies of Scabrethia scabra evidently have evolved along with the dissection of the Colorado Plateau.
|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||Scabrethia scabra subsp. attenuata|
|1||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||> 2|
|2||Herbaceous tips of outer phyllaries usually spreading to recurved, margins (not ciliate) and faces minutely hispidulous to hirtellous||Scabrethia scabra subsp. canescens|
|2||Herbaceous tips of outer phyllaries usually ± erect to spreading, margins (± ciliate) and faces ± coarsely hispid||Scabrethia scabra subsp. scabra|
"broader" is not a number.