Malvaceae Family: Mallow Family Characters and Examples

Malvaceae is the mallow family of flowering plants. It includes cotton, lady's finger (bhindi), hibiscus, hollyhock, and jute relatives. Its flowers are large and showy with five petals, and a special column of many stamens surrounds the style.

This family is economically huge. Cotton fibre clothes much of the world, bhindi is a common vegetable, hibiscus is a favourite garden plant, and some members give mucilage used in food and medicine.

Key Concepts

Plants are herbs, shrubs, or trees with alternate, stipulate leaves and mucilage in tissues. Flowers are solitary, bisexual, and actinomorphic.

• Epicalyx: A whorl of bracteoles below the calyx, common in hibiscus and cotton.
• Calyx: 5 sepals, united. Corolla: 5 petals, free, often twisted.
• Androecium: Many stamens, monadelphous — filaments united into a staminal tube around the style; anthers are one-lobed (monothecous).
• Gynoecium: Multicarpellary (often 5 or more), syncarpous, superior ovary, multilocular.
• Fruit: Capsule (cotton, bhindi) or schizocarp.

Floral formula: ⊕ ⚥ EpiK K(5) C5 A(∞) G(5-∞).

How It Works

1. The epicalyx protects the young bud like an extra green cover.
2. Large coloured petals attract pollinators from a distance.
3. The staminal tube places many one-lobed anthers around the stigma for effective pollen transfer.
4. After fertilisation, the locules form a capsule that opens to release seeds, often with fibres in cotton.

Worked Example

A hibiscus flower has 5 carpels and 5 locules. If each locule has 4 ovules, total ovules = 5 × 4 = 20. In cotton, if one boll has 5 locules with 8 seeds each, seeds per boll = 5 × 8 = 40. From 50 bolls, seeds = 50 × 40 = 2,000 seeds, each covered with lint fibre.

Common Misconceptions

• Cotton fibre is the seed itself: Wrong. Cotton lint is an outgrowth of the seed coat; the seed lies inside.
• Stamens are free and few: Wrong. They are numerous and united into a tube — monadelphous.
• Epicalyx is the true calyx: Wrong. Epicalyx is bracteoles below the true 5-sepal calyx.

Real-World Applications

Gossypium gives cotton fibre for textiles and seed oil, bhindi (Abelmoschus esculentus) is a vegetable, hibiscus is ornamental and used in hair care, and mucilage from mallow plants is used in traditional medicine and food thickening.

Monadelphous stamens, monothecous anthers, epicalyx, and mucilage mark Malvaceae — the family of cotton clothing and everyday bhindi.