Abstract (Student Project 5 - Botany on CUHK Campus)
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Botany on CUHK Campus
Student Project No. 5
Andreas Ching Shing
It is an evergreen tree with large thick leaves and purplish red flowers. The fragrant, orchid-like flowers are usually 10-15 cm across, and bloom from early November to the end of March.
The double-lobed leaves are heart-shaped, 7-10 cm long and 10-13 cm broad, with a deep cleft dividing the apex. Local people call the leaf ‘chung ming yip’ (聰明葉), which literally means clever leaf, and regard it as a symbol of smartness.
A perennial grass. The stems are scandent, or decumbent, or prostrate, of 30–300 cm long. Roots emerge from lower nodes. The ligule is a ciliolate membrane. The leaf-blades are 5–25 cm long and 2–10 mm wide, with an attenuate apex.
Nephrolepis exaltata cv. Bostoniensis
This ornamental fern produces fronds (leaves) with a stiff midrib and many fish-shaped leaflets set closely along each side of the midrib.
A large fern, to 2-3 m tall. Its underground stems are densely covered with golden brown hairs and used in herbal medicine. Its leaves are up to 2 m long and 1 m wide, tripinnatifid; indusium dehiscent into two equal halves when mature.
This gymnosperm is dioecious and palm-like. It has feather-like leaves, with stiff and pointed leaflets.
The female inflorescence is feather-like, later forming a tightly packed seed head. The male cone is pineapple-shaped. Seeds are brownish-red, appearing like flattened marbles.
The Chinese idiom “Iron Trees bloom into flowers 鐵樹開花” actually refers to this plant.
It is a low-lying herb of 15-30 cm tall, commonly used as groundcover or ornamental plant.
The leaves are ovate, 5 cm long, dark green with 2 broad bands of silver on the upper surface and vivid purple underneath.
An ornamental plant. Its leaves are erect, ensiform, to 1 m long, rather thick and fibrous, variously striped and banded with white, yellow or shades of green, and sharp-pointed at apex. Its flowers are yellowish-white or tinged greenish, arranged in a raceme.
Mikania micrantha Asteraceae
It is the most noxious weed in Hong Kong. It is a vine with heart-shaped or spearhead-shaped leaves arranged on opposite sides of the stem. It flowers from October to late February, and sets fruit from December to March. The fruits are tiny, 1.2-2(3) mm long and 0.2-0.6 mm in diameter, and bear a plume of hair at the apex giving them great ability for dispersal to invade disturbed habitats.
Wedelia trilobata Asteraceae
It is a tropical perennial, with deeply lobed leaves. It is low-lying, spreading like a mat to form a dense cover, if allowed. It blossoms profusely; the flowers are orange-yellow.
Often used as a groundcover in shade and on slopes. It becomes weedy in some areas.
This bamboo is caespitose, with short rhizomes. Its stems are erect, 7-15 m tall; 5 cm across. The stem sheaths are glabrous, auriculate and ciliate on shoulders; the blades of the stem sheaths are triangular, erect, and hairy at base.
Easy to grow and commonly used as ornamentals in parks.
It is a fast-growing tree of 4-5 m tall. It generally branches only when injured. All parts contain latex. The hollow green or deep purple trunk is straight and cylindrical with prominent leaf scars. The leaves are deeply toothed with a long petiole. The fruit is a berry and is very delicious.
It is a very popular ornamental plant, with stipulated dark green leaves bearing teeth along margins. Its flowers are single with 5 petals or double with many more petals modified from stamens. Different strains and cultivars have flowers of various colors, the more common being red and pink. The filaments of the numerous stamens are fused together into a tube, sheathing the style. The five stigmas are round and velvety.
It is a woody perennial vine, with stout thorns on stems. The leaves are alternate, simple, ovate to somewhat elliptic, to about 10 cm long. Flowers in axillary clusters of threes, each flower with a purple, red, pink, or orange bract beneath. It has no petals. The flower tube is formed by the sepals fusing together; it has the same color as the bracts, and bear 5 white lobes of about 3 mm long.
It is a climbing or creeping herb. The structures that most refer to as leaves are actually leaf-like branchlets called cladophylls. These tiny cladophylls are linear, flattened structures that are bright green in color. They occur singly or in groups of 3 or more at a node. The stem is spiny. The flowers are unisexual, only one sex on any one plant.
It is a perennial growing to 80 cm tall. It has glossy, dark green, oval leaves and flowers all summer long.
The flowers of the natural wild plants are pale pink with a purple ‘eye’ in the center. A strain with white flowers is also common in Hong Kong.
Chemicals extracted from this plantincrease the survival rate of childrenwith leukemia from 20% to 80%.