in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 10: 498. 1846.
Perennials; not blackening upon drying. Stems simple or branched distal to middle, 2–6 dm, spreading- or ascending-hispid, hairs pustular-based. Leaves not smaller distally; blade obscurely 3-nerved, linear to linear-lanceolate, 20–50 x 2–6 mm, margins entire or irregularly dentate, teeth 0.5–2 mm, apex acute, surfaces short-hispid. Spikes: bracts ovate-lanceolate, 5–9 mm. Pedicels 0–1 mm; bracteoles 5–9 mm. Flowers: calyx 7–9 mm, tube prominently 10-nerved, ascending-hispid, hairs pustular-based; corolla 10–15 mm, hairy externally, lobes 3–5 mm; style included, 2–3 mm. Capsules blackish, ovoid, 4.5–6 mm, glabrous. Seeds 0.6–0.8 mm.
Phenology: Flowering Aug–Sep.
Habitat: Streamsides in oak woodlands.
Elevation: 1100–2000 m.
Ariz., Mexico, Central America (Guatemala, Honduras), South America (Ecuador).
Buchnera obliqua was first collected in the flora area in the Huachuca Mountains in August 1882; it was next collected in 1993, also from the Huachuca Mountains.