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3. Xylorhiza glabriuscula Nuttall, Trans. Amer. Philos. Soc., n. s. 7: 297. 1840.
Smooth woody-aster
Aster parryi A. Gray; Machaeranthera glabriuscula (Nuttall) Cronquist & D. D. Keck; M. glabriuscula var. villosa (Nuttall) Cronquist & D. D. Keck; Xylorhiza glabriuscula var. villosa (Nuttall) A. Nelson; X. villosa Nuttall
Subshrubs, 10–25 cm. Stems branched mostly in proximal 3 / 4 (leafy 2 / 3 + their lengths), villoso-puberulent or glabrous, eglandular. Leaf blades oblanceolate, 2.5–8 mm wide, bases attenuate, not clasping, margins flat, entire, faces villoso-puberulent or glabrous, eglandular. Peduncles 2–6 cm. Involucres 7–14 × 12–25 mm. Ray florets 12–25; corollas white. Style-branch appendages equal or shorter than stigmatic lines. 2n = 12.
Flowering May–Jun(–Jul). Open sites, selenious, alkaline clays, dominated by sagebrush, saltbush, greasewood, and grasses; 1100–2300 m; Colo., Mont., S.Dak., Utah, Wyo.
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