Cronquist's Woodyaster

Xylorhiza cronquistii grows in Kane County. S. L. Welsh et al. (2003) noted that it is "more or less intermediate in morphologic features between X. confertifolia and X. tortifolia var. imberbis; it occurs on habitats intermediate between the two parental types and is at the approximate summit of the distribution of the latter."

Subshrubs, ca. 30 cm. Stems branched mostly in proximal ³ / 4 , sparsely villous and stipitate-glandular to subglabrous. Leaf blades linear-lanceolate to narrowly oblanceolate, 2.5–6 mm wide, bases attenuate, not clasping, margins flat, usually shallowly spinulose-toothed, sometimes entire, faces sparsely villous. Peduncles 5–10 cm. Involucres 10–12 × 13–18 mm. Ray florets 13–17; corollas white. Style-branch appendages ± equal or slightly shorter than stigmatic lines.

Machaeranthera cronquistii (S. L. Welsh & N. D. Atwood) Cronquist

Xylorhiza cronquistii, common name Cronquist's woody-aster, is a plant species endemic to the Kaiparowits Plateau in Grand Staircase–Escalante National Monument in Kane County, Utah at elevations of 1900–2100 m.

Xylorhiza cronquistii is a subshrub up to 30 cm tall. Leaves are narrowly lanceolate, sometimes with small spines along the margins. Flowers are borne in heads containing 13-17 white ray flowers plus some yellow disc flowers.