Brassicaceae
Brassicaceae Burnett (alternative conserved name Cruciferae) comprises approximately 340–360 genera and 4,000–4,100 species, making it one of the largest families of flowering plants in temperate regions. Recent molecular phylogenetic studies have refined tribal and generic boundaries, although the family remains a well-supported monophyletic lineage characterized by its distinctive cruciform flowers, tetradynamous stamens, and glucosinolate chemistry.
Key characteristics
- Annual or perennial herbs, rarely shrubs
- Leaves alternate, exstipulate, often forming basal rosettes
- Flowers with four free petals arranged in a cross
- Six stamens (4 long + 2 short; tetradynamous)
- Superior bicarpellate ovary
- Fruit a silique or silicle
- Characteristic glucosinolates (mustard oils) producing a pungent odour and taste
Distribution
Brassicaceae has a nearly cosmopolitan distribution, occurring on all continents except Antarctica. The family is particularly diverse in the Mediterranean Basin, Southwest and Central Asia, Europe, western North America, and temperate South America. Species occupy diverse habitats including alpine meadows, deserts, steppes, grasslands, agricultural fields, rocky slopes, wetlands, and disturbed environments. Many are pioneer species adapted to open habitats. Brassicaceae is one of the largest plant families in Pakistan, occurring throughout. It is especially abundant in the Himalaya, Karakoram, Hindu Kush, Salt Range, Potohar Plateau, and uplands, where numerous endemic and alpine species occur. Members grow in cultivated fields, wastelands, deserts, alpine meadows, riverbanks, rocky slopes, saline soils, and temperate forests. Both wild and cultivated taxa contribute significantly to Pakistan's agricultural and natural ecosystems.