Shrub or tree to 6 m high. Branchlets terete or slightly ridged, with leaf bases not decurrent, not glandular-verrucose, pubescent with stellate and simple hairs. Leaves trifoliolate; petiole 5–21 mm long, terete or with lateral ribs; central leaflet narrowly elliptic, oblong or lanceolate, (32–) 60–75 (–120) mm long, 3–19 mm wide, entire, recurved at margins, acute (rounded in Colo River Gorge population); both surfaces not glandular-verrucose; adaxial surface pubescent to with only a few hairs; abaxial surface velvety to hirsute, with midrib pubescent to hirsute, secondary venation sometimes prominent. Inflorescences shorter than leaves, 180–420-flowered; inflorescence bracts 8–12 mm long. Sepals 2–2.5 mm long, hirsute to almost glabrous abaxially. Petals imbricate, c. 4.5 mm long, creamy white, pubescent on both surfaces. Filaments slightly glandular-verrucose apically. Cocci not apiculate, glabrous.
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