Asparagaceae
Asparagaceae Juss. comprises approximately 120–125 genera and more than 3,500 species distributed worldwide. Modern molecular phylogenetic studies have greatly expanded the circumscription of Asparagaceae by incorporating several formerly recognized families, including Agavaceae, Hyacinthaceae, Convallariaceae, Ruscaceae, Dracaenaceae, Nolinaceae, and Themidaceae, which are now treated as subfamilies within Asparagaceae. This broad circumscription reflects a well-supported monophyletic lineage.
Key characteristics
- Perennial herbs, shrubs, climbers, or succulent plants
- Rhizomes, bulbs, tubers, or fleshy roots commonly present
- Leaves simple or reduced to cladodes (Asparagus)
- Flowers with six petaloid tepals and six stamens
- Superior, tricarpellate ovary
- Fruit a berry or capsule
Distribution
Asparagaceae has a nearly cosmopolitan distribution, occurring in tropical, subtropical, and temperate regions of all continents except Antarctica. The family exhibits greatest diversity in southern Africa, the Mediterranean Basin, Mexico, Central America, and eastern Asia. Members occupy an exceptionally broad range of habitats, including forests, grasslands, deserts, rocky slopes, coastal dunes, alpine meadows, and semi-arid regions. Numerous species are widely cultivated and have become naturalized outside their native ranges. In Pakistan, Asparagaceae is represented by native, naturalized, and cultivated species inhabiting grasslands, scrub forests, rocky hillsides, deserts, cultivated fields, alpine meadows, and forest margins. Species of Asparagus are particularly widespread in dry and semi-arid regions, whereas bulbous taxa are more common in temperate mountainous areas.