Boraginaceae
Boraginaceae Juss. is an accepted family in the order Boraginales, under the APG IV system, Boraginales is recognized as an unplaced order among the lamiids pending further phylogenetic resolution. The family comprises approximately 90–95 genera and 1,700–1,800 species distributed worldwide. Recent molecular studies have resulted in the recognition of Boraginales as a distinct order and have clarified relationships among several formerly included subfamilies and allied families. Boraginaceae is characterized by its rough pubescence, scorpioid cymes, and four-lobed ovary producing nutlets.
Key characteristics
- Annual or perennial herbs, shrubs, or rarely trees
- Plants usually rough with stiff, swollen-based hairs
- Leaves alternate, simple, and exstipulate
- Inflorescence a characteristic scorpioid cyme
- Flowers actinomorphic with fused petals
- Superior four-lobed ovary with a gynobasic style
- Fruit usually four nutlets
Distribution
Boraginaceae has a nearly cosmopolitan distribution, occurring from tropical to temperate regions on all continents except Antarctica. The greatest diversity is found in the Mediterranean Basin, Southwest Asia, Central Asia, western North America, and the Andes. Species occupy a broad range of habitats including grasslands, deserts, alpine meadows, rocky slopes, forests, coastal dunes, disturbed sites, and agricultural fields. Boraginaceae is well represented throughout Pakistan. Species occur in alpine meadows, temperate forests, dry rocky slopes, steppe vegetation, deserts, cultivated fields, riverbanks, and wastelands. Genera such as Arnebia, Onosma, Cynoglossum, Echium, Heliotropium, Lappula, Myosotis, Nonea, Lithospermum, and Trichodesma are common components of Pakistan's flora, particularly in mountainous and arid ecosystems.