Henrieville woody-aster

Machaeranthera glabriuscula (Nuttall) Cronquist & D. D. Keck var. confertifolia Cronquist, Leafl. W. Bot. 10: 11. 1963; M. confertifolia (Cronquist) Cronquist

Subshrubs 10–15(–23) cm. Stems branched mostly in proximal ³ / 4 (leaves numerous, crowded, internodes averaging 2–3 mm), finely stipitate-glandular or nearly glabrous. Leaf blades linear, 1–2.5 mm wide, bases attenuate, not clasping, margins involute, entire, faces puberulent and/or minutely stipitate-glandular. Peduncles 2–14 cm. Involucres 8–12 × 10–16(–20) mm. Ray florets 4–14; corollas white. Style-branch appendages ± equal stigmatic lines. 2n = 12.

Flowering May–Jul. Barren slopes in alkaline clay, pinyon-juniper; of conservation concern; 1400–2300 m; Utah.

Xylorhiza confertifolia is known form Garfield and Kane counties.