Plants erect, leafy, weak-stemmed. Leaves 1.5–3 × 6–11 cm; blade narrowly lanceolate to elliptic-spatulate on fertile shoots, broader on sterile shoots, glabrous, base cuneate, apex acute to rounded; petiole 2–4 cm. Umbels 3–8-flowered, bracteate. Flowers: tepals red to wine, spotted purplish brown, greenish at apex, narrowly spatulate, 3.5–4.5 cm, apex and margins of base slightly puberulent; pedicel 1.5–3 cm. Capsules globose, 1.3 × 1 cm, bluntish terminal portion with several spinose acuminations, each valve narrowly winged adaxially.
Phenology: Flowering mid spring–early summer.
Habitat: Loose or sandy soils in shade to partially sunny, moist, disturbed sites
Elevation: 0–100 m
Introduced; Ala., Fla., Ga., La., Miss., Brazil.
Alstroemeria pulchella is used as an outdoor ornamental in the warmer parts of the United States, where it has escaped and apparently become naturalized.