Callirhoe triangulata aka Clustered Poppy Mallow

Callirhoe triangulata belongs to the mallow family, Malvaceae. Its common name is clustered poppy mallow. It is a perennial, so it grows for more than one year. It comes from the east-central and southeastern United States. Its range takes in parts of the Midwest and deep South. Past records place it in four Missouri counties. It is now very rare there and may have died out. This local record does not show its status throughout its range.

The plant grows upright on slim stems that branch. Garden plants reach 1–3 feet [0.30–0.91 metres] tall. Their spread reaches about 2 feet [0.61 metres]. Hairs cover the stems, leaves, and flower stalks. The leaves at the base have a triangular shape. Leaves along the stems are narrower. Some of these leaves have lobes. These shifts in leaf shape help describe the plant.

The flowers add deep rose-purple colour to the summer garden. Each flower has five petals. The listed bloom season runs from July to August. The showy blooms give the plant clear value in gardens. It suits borders and gardens of native plants. It fits cottage gardens and wild gardens, too. Other uses include meadows, prairies, and naturalized areas. In these last areas, plants grow with a wild look. Gardeners can use it in formal beds or less formal sites. Its upright form contrasts with its slim stems that branch.

Grow this species in full sun. Give it soil that drains well. It likes gritty soil and dry to medium moisture levels. In the wild, it grows in prairies and open woods. It also grows in limestone glades, or open, rocky sites. Other sites include sandy open ground and rocky soils. A taproot helps it cope with drought once it takes root. That same root makes plants hard to move once settled. Choose its place with that limit in mind. The listed hardiness range is USDA zones 5–8.

This plant needs little care when its growing needs are met. Missouri Botanical Garden reports no serious insect or disease problems. That does not mean each plant will stay free of trouble. Good drainage and sun are its stated growing needs. It copes with drought, which makes it useful in dry soil. The supplied sources give no facts on edible parts for this species. They also give no firm evidence on toxicity or use as medicine.