Rhizomes 4–6 cm × 5–10 mm proximally, to 20+ cm × 1–2 mm distally. Stems 1–4, 2–3 m × 1–2 mm. Leaves: stipules del­tate, 1 mm; petiole angular, sul­cate adaxially, 1–4 cm; stipels persistent, striate, linear to subulate, 1–2 mm; petiolules 1.5–2 mm; rachis 0.5–1.5 cm; leaflet blades elliptic or elliptic-lanceolate to lanceolate, 15–55 × 8–25 mm, leathery, base rotund to truncate, primary lateral veins 5–7 pairs, apex broadly acute. Inflorescences 1 per node, 3–8 cm; bracts striate, concave around pedicel, elliptic-ovate, 4–6 mm; bracteoles striate, lanceolate-ovate, 8–10 × 4–5 mm, adaxial surface with uncinulate hairs; rachis flexuous, 1–1.5 cm, strigose. Pedicels 5–8 mm, 10–14 mm in fruit, thinly pilose. Flowers: calyx tube 3–4 × 5–7 mm, lobes unequal, abaxial and lateral ones 4–6 mm, adaxial one 8–11 mm, hairs uncinulate; corolla lavender to pinkish lavender; banner 20–30 mm, claw 5–6 mm, spur 2 mm; wings 20–24 × 4 mm, claw 5–6 mm; keel 20–25 × 10–11 mm, claw 4–5 mm; staminal tube 32–34 mm; apical distinct filaments 3–4 mm; ovary 16–19 mm; style 17–20 mm, apex dilated 2 × 1 mm, barbate. Legumes: dehiscence causing valve to twist 2–3 turns, (70–)90–125 × 5–6 mm; beak 8–12 mm. Seeds 8–12, brownish black, 3–4 × 4–5 × 1 mm.

Phenology: Flowering and fruiting Jun–Sep.
Habitat: Sandy soils in open areas, roadsides, railroads, scrub, open pinewoods, margins of oak-sabal palmetto woods.
Elevation: 0–20 m.

Distribution

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Fla.

Discussion

Centrosema arenicola is known from central Florida.

Selected References

None.

Lower Taxa

None.