Cupressaceae
Cupressaceae Gray comprises approximately 30 genera and 140–150 species, making it the largest family of conifers by generic diversity. Modern molecular phylogenetic studies have expanded the family to include the former Taxodiaceae, incorporating genera such as Sequoia, Sequoiadendron, Metasequoia, Taxodium, and Cryptomeria within Cupressaceae. Members are characterized by evergreen woody habit, scale-like or needle-like leaves, woody seed cones, and aromatic resinous tissues.
Key characteristics
- Evergreen trees or shrubs with aromatic resin
- Bark fibrous or longitudinally peeling
- Leaves opposite or in whorls; scale-like, awl-shaped, or needle-like
- Male and female cones separate
- Female cones woody or leathery, composed of fused scales
- Wind-pollinated
- Seeds winged or wingless
Distribution
Cupressaceae is distributed throughout North America, Europe, Asia, North Africa, Central America, South America, and Australasia, with major centres of diversity in western North America, East Asia, the Mediterranean Basin, and the Himalayas. Members occur in temperate forests, Mediterranean woodlands, montane regions, dry rocky slopes, deserts, and subalpine habitats. The family is naturally distributed in the Himalayan, Karakoram, Hindu Kush, and western mountain regions. Native Juniperus species dominate dry mountain forests, particularly in Ziarat, while Cupressus sempervirens, Platycladus orientalis, Thuja occidentalis, and several ornamental cypresses are widely cultivated in parks, botanical gardens, cemeteries, university campuses, and urban landscapes throughout Pakistan.