Botanical Name: Cornus florida
Species: C. florida
Synonyms: Bitter Redberry. Cornel. New England Boxwood. Dog-Tree. Flowering Dogwood. American Dogwood. Benthamidia florida. Box Tree. Virginian Dogwood. Cornouiller à grandes fleurs. Mon-ha-can-ni-min-schi. Hat-ta-wa-no-minschi.
Common Name: Flowering dogwood
Habitat: Cornus florida is native to eastern North America, from southern Maine west to southern Ontario, Illinois, and eastern Kansas, and south to northern Florida and eastern Texas, with a disjunct population in Nuevo León and Veracruz in eastern Mexico. In Ontario, this tree species has been assessed and is now listed as endangered.
Flowering dogwood is a small deciduous tree growing to 10 m (33 ft) high, often wider than it is tall when mature, with a trunk diameter of up to 30 cm (1 ft). A 10-year-old tree will stand about 5 m (16 ft) tall. The leaves are opposite, simple, ovate, 6–13 cm (2.4–5.1 in) long and 4–6 cm (1.6–2.4 in) broad, with an apparently entire margin (actually very finely toothed, under a lens); they turn a rich red-brown in fall……..CLICK & SEE THE PICTURES
The flowers are individually small and inconspicuous, with four greenish-yellow bracts 4 mm (0.16 in) long. Around 20 flowers are produced in a dense, rounded, umbel-shaped inflorescence, or flower-head, 1–2 cm (0.39–0.79 in) in diameter. The flower-head is surrounded by four conspicuous large white, pink or red “petals” (actually bracts), each bract 3 cm (1.2 in) long and 2.5 cm (0.98 in) broad, rounded, and often with a distinct notch at the apex. The flowers are bisexual.
When in the wild they can typically be found at the forest edge and popular on dry ridges. While most of the wild trees have white bracts, some selected cultivars of this tree also have pink bracts, some even almost a true red. They typically flower in early April in the southern part of their range, to late April or early May in northern and high altitude areas. The similar Kousa dogwood (Cornus kousa), native to Asia, flowers about a month later.
The fruit is a cluster of two to ten drupes, each 10–15 mm (0.39–0.59 in) long and about 8 mm (0.31 in) wide, which ripen in the late summer and the early fall to a bright red, or occasionally yellow with a rosy blush. They are an important food source for dozens of species of birds, which then distribute the seeds.
Cultivation: Flowering dogwood does best horticulturally in moist, acidic soil in a site with some afternoon shade, but good morning sun. It does not do well when exposed to intense heat sources such as adjacent parking lots or air conditioning compressors. It also has a low salinity tolerance. The hardiness zone is 5–9 and the preferred pH is between 6.0–7.0. In urban and suburban settings, care should be taken not to inflict mower damage on the trunk or roots, as this increases the tree’s susceptibility to disease and pest pressure.
Propagation: Cornus florida is easily propagated by seeds, which are sown in the fall into prepared rows of sawdust or sand, and emerge in the spring. Germination rates for good clean seed should be near 100% if seed dormancy is first overcome by cold stratification treatments for 90 to 120 days at 4 °C (39 °F). Flowering dogwood demonstrates gametophytic self-incompatibility, meaning that the plants can’t self-fertilize. This is important for breeding programs as it means that it is not necessary to emasculate (remove the anthers from) C. florida flowers before making controlled cross-pollinations. These pollinations should be repeated every other day, as the flowers must be cross-pollinated within one or two days of opening for pollinations to be effective.
Softwood cuttings taken in late spring or early summer from new growth can be rooted under mist if treated with 8,000 to 10,000 ppm indole-3-butyric acid (IBA). In cold climates, potted cuttings must be kept in heated cold frames or polyhouses the following winter to maintain temperatures between 0 and 7 °C (32 and 45 °F). Although rooting success can be as high as 50–85%, this technique is not commonly used by commercial growers. Rather, selected cultivars are generally propagated by T-budding in late summer or by whip grafting in the greenhouse in winter onto seedling rootstock.
Micropropagation of flowering dogwood is now used in breeding programs aiming to incorporate resistance to dogwood anthracnose and powdery mildew into horticulturally and economically important cultivars. Nodal (axillary bud) sections are established in a culture of Woody Plant Medium (WPM) amended with 4.4 µmol/L 6-Benzyladenine (BA) to promote shoot growth. Rooting of up to 83% can be obtained when 5–7 week-old microshoots are then transferred to WPM amended with 4.9 µmol/L IBA
Part Used for Medicines:: The dried bark of the root.
Constituents: The bark has been found to contain tannic and gallic acids, resin, gum, extractive, oil, wax, red colouring matter, lignin, potassa, lime, magnesia, iron, and a neutral, crystalline glucoside called Cornin. Either water or alcohol extracts the virtues of the bark. The flowers are said to have similar properties, and to be sometimes used as a substitute. It is said that the berries, boiled and pressed, yield a limpid oil.
Medicinal Uses: Before Europeans discovered America, the Red Indianswere using the bark in the same way as Peruvian bark. It is valuable in intermittent fevers, as a weak tonic for the stomach, and antiperiodic, as a stimulant and astringent. As a poultice in anthrax, indolent ulcers, and inflamed erysipelas, it is tonic, stimulant and antiseptic. In the recent state it should be avoided, as it disagrees with stomach and bowels. Cinchona bark or sulphate of quinea often replace it officially. 35 grains of Cornus bark are equal to 30 grains of cinchona bark.
The ripe fruit, infused in brandy, is used as a stomachic in domestic practice, and a tincture of the berries restores tone to the stomach in alcoholism. Hippocrates, Dioscorides, and Pliny recommend them in diarrhoea.
Root-bark tea or tincture widely used for malaria and diarrhea throughout South during the Civil War. Also used as a poultice for external sores and ulcers.
Fruits: Berries soaked in brandy for heart burn and upset stomach.
Twigs: Twigs chewed for cleaning teeth
The leaves make good fodder for cattle, and in Italy the oil is used in soups.
Disclaimer : The information presented herein is intended for educational purposes only. Individual results may vary, and before using any supplement, it is always advisable to consult with your own health care provider.