// SPECIES PROFILE · ANNUAL · NATIVE

Warty caltrop

Kallstroemia parviflora

Warty caltrop (Kallstroemia parviflora) is a annual in the — family. Native range includes KS, MO, OK. Hardy in zones 2b–11a. Mature size 2'–5'. Blooms Apr–Nov.

// QUICK FACTS

Family: —
Group: annual
Native range: Native to 15 U.S. states, including AZ, CA, CO, DC, IL, KS…
USDA hardiness: Zones 2b–11a
Mature size: 2'–5'
Sun: Full sun
Water: —
Bloom: Apr–Nov
Wildlife value: Pollinator and wildlife support
Ecological role: native species profile

Warty caltrop (Kallstroemia parviflora) — *Kallstroemia parviflora* — Warty caltrop. Photo via Wikimedia Commons (CC BY 4.0).

Field Notes

[ growing · ecology · siting · care ]

Warty caltrop (Kallstroemia parviflora) is a annual in the — family. Native range includes KS, MO, OK. Hardy in zones 2b–11a. Mature size 2'–5'. Blooms Apr–Nov.

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, warty caltrop pairs naturally with: Common Sunflower (Helianthus annuus), Swamp verbena (Verbena hastata), Powell's amaranth (Amaranthus powellii), Green amaranth (Amaranthus powellii ssp. powellii).