Shrubs erect, bushy, 10–50 dm. Stems: internodes 4-lined at first, then terete. Leaves spreading, sessile; blade narrowly elliptic to narrowly elliptic-oblong, 20–70 × 5–15 mm, (proximal usually narrower), base narrowly cuneate to subangustate, margins plane, apex acute to apiculate-obtuse, midrib with 8–12 pairs of branches, tertiary veins densely reticulate toward margins. Inflorescences broadly rounded-pyramidal to broadly cylindric, to 30-flowered. Flowers: sepals lanceolate, unequal, 3–4.5 × 1–2.2 mm; petals bright yellow, not red-tinged, oblanceolate-unguiculate, 12–17 mm; anther gland yellow to orange; styles widely spreading, 8–14 mm. Capsules pyramidal-ovoid to ovoid-ellipsoid, 9–12 × 7–8 mm. Seeds 1.5–2 mm, narrowly winged; testa linear-reticulate to linear-foveolate. 2n = 40.
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