// SPECIES PROFILE · ANNUAL · NATIVE

Red river scaleseed

Spermolepis inermis

Red river scaleseed (Spermolepis inermis) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2b–11b. Mature size 6"–2'. Blooms Mar–May.

// QUICK FACTS

Family: —
Group: annual
Native range: Native to 17 U.S. states, including AL, AR, FL, IA, IL, IN…
USDA hardiness: Zones 2b–11b
Mature size: 6"–2'
Sun: —
Water: —
Bloom: Mar–May
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Red river scaleseed (Spermolepis inermis) — *Spermolepis inermis* — Red river scaleseed. Photo via iNaturalist — no rights reserved.

Field Notes

[ growing · ecology · siting · care ]

Red river scaleseed (Spermolepis inermis) is a annual in the — family. Native range includes AR, KS, MO, OK. Hardy in zones 2b–11b. Mature size 6"–2'. Blooms Mar–May.

Why it's on this list: native species profile. Native-range data from the Lady Bird Johnson Wildflower Center (NPIN), cross-checked against iNaturalist observations. Part of Rooted Revival's regional native plant catalog — true natives for Oklahoma, Arkansas, Missouri and Kansas.

Companion Planting

[ guild · polyculture · cross-layer pairings ]

In the same native range, red river scaleseed pairs naturally with: Black-Eyed Susan (Rudbeckia hirta), Common Sunflower (Helianthus annuus), Plains Coreopsis (Coreopsis tinctoria), Partridge pea (Chamaecrista fasciculata var. fasciculata).