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Dogwood - Cornus sanguinea

Kingdom: Plantae 

Division: Magnoliophyta 

Class: Magnoliopsida 

Order: Cornales 

Family: Cornaceae 

Genus: Cornus 

Species: C. sanguinea 

The Dogwoods comprise a group of 30-50 species of deciduous woody plants (shrubs and trees) in the family Cornaceae, divided into several genera.

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​The name 'dogwood' is believed to be a corruption of 'dagwood', from the use of the slender stems of very hard wood for making 'dags' (daggers, skewers). The wood was also highly prized for making the shuttles of looms, for tool handles, and other small items that required a very hard and strong wood. Or In the past, a water-based extract made from this plant was used as a treatment for mange in domestic dogs, hence the English common name. Though this may well be a cure for the dog from the medieval habit of treating illnesses according to the names or shapes of the plants.

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Dogwood is a medium-sized, growing to 4m (13ft) usually on chalk, deciduous shrub with dark green, slightly downy leaves that provide excellent autumn foliage as they turn from green, through orange to red. The leaves are on on stalks 8-15 mm long.  The leaves are opposite, 4-8 cm long and 2-4 cm broad, with an ovate to oblong shape and an entire margin with 3-4 pairs of veins curving to the tip, ; they are green above, slightly paler below, and rough with short stiff pubescence and both surfaces are covered in appressed hairs. If gently broken in half across the veins, the two parts will stay together, held by the spiral vascular bundles.  Recognised by red stems with opposing veined oval pointed leaves with red stalks. It is planted mainly for the red shoots and branches that provide good winter colour. It needs yearly pruning to keep this colour in the branches. Greenish white flowers appear in June, and have a rather unpleasant scent, but this seems to be attractive to numerous insects including bees. The flowers are small (5-10 mm diameter), with four creamy white petals, hairy on the outside, produced in clusters 3-5 cm diameter on short, branched stalks. They are hermaphrodite (have both male and female organs) and are pollinated by Insects. The fruit is a globose black berry 5-8 mm diameter, containing a single seed. The blue-black berries are eaten by a range of birds. Dogwood spreads readily through suckers. It is hardy and is not frost tender to about -25°c. They grow badly when exposed to strong cold winds. The plant prefers light (sandy), medium (loamy) and heavy (clay) soils and can grow in heavy clay soil. The plant prefers acid, neutral and basic (alkaline) soils and can grow in very alkaline soil. It can grow in semi-shade (light woodland) or no shade, though they are not happy when growing in dense shade. It requires moist soil. 

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Plants have a suckering habit and can quickly form dense thickets. They can be coppiced regularly and will throw up long straight stems after being cut back. 

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Propagation ;

Seed - best sown as soon as it is ripe in a cold frame or in an outdoors seedbed if there is sufficient seed. The seed must be separated from the fruit flesh since this contains germination inhibitors. Stored seed should be cold stratified for 3 - 4 months and sown as early as possible in the year. Scarification may also help as may a period of warm stratification before the cold stratification. Germination, especially of stored seed, can be very slow, taking 18 months or more. Prick out the seedlings of cold-frame sown seeds into individual pots as soon as they are large enough to handle and grow the plants on for their first winter in a greenhouse, planting out in the spring after the last expected frosts. 

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​Cuttings of half-ripe side shoots, July/August in a frame. Cuttings of mature wood of the current year's growth, taken with a heel if possible, autumn in a cold frame. High percentage. 

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An oil is obtained from the seed, it is edible when refined.

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Known Hazards: Contrary to some reports, the fruit is not poisonous, but the leaves can cause skin irritations to sensitive people.

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Medicinal Uses: Astringent; Emetic; Febrifuge. 

The bark is astringent and febrifuge. It is used to treat fevers. 

The leaves are sometimes used externally as an astringent. 

The fruit is emetic. 

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Other Uses

The young stems are very flexible and are used in basketry. A greenish-blue dye is obtained from the fruit.  Charcoal; Hedge;  Wood - tough, hard. Used for small items such as tool handles, turnery etc. A good quality charcoal is obtained from the wood, the wood also makes an excellent fuel. 

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The seed contains 45% of a non-drying oil, it is used in soap making and lighting. A non-drying oil is also obtained from the pericarp, it is used for lighting. The pericarp contains 19 - 35% oil. The Welsh call it the wax tree because the berries are a source of lamp oil. The term dogwood winter may be used to describe a cold snap in spring. 

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genus Cornus. Dogwoods; about 20-30 species of shrubs; flower clusters without an involucre.

  • Cornus alba (Siberian Dogwood). Siberia and northern China. 

  • Cornus alternifolia (Pagoda Dogwood or Alternate-leaf Dogwood). Eastern North America north to extreme southeast Canada. 

  • Cornus amomum (Silky Dogwood). Eastern U.S. east of the Great Plains except for deep south, and extreme southeast Canada. 

  • Cornus asperifolia (Rough-leaf Dogwood). 

  • Cornus austrosinensis (South China Dogwood). East Asia. 

  • Cornus bretschneideri (Bretschneider's Dogwood). Northern China.

  • Cornus controversa (Table Dogwood). East Asia. 

  • Cornus coreana (Korean Dogwood). Northeast Asia.

  • Cornus drummondii (Roughleaf Dogwood). U.S. between the Appalachian belt and the Great Plains, and southern Ontario. 

  • Cornus glabrata (Brown Dogwood or Smooth Dogwood). Western North America. 

  • Cornus hemsleyi (Hemsley's Dogwood). Southwest China

  • Cornus koehneana (Koehne's Dogwood). Southwest China. 

  • Cornus macrophylla (Large-leafed Dogwood). East Asia. 

  • Cornus obliqua (Pale Dogwood). Eastern North America.

  • Cornus paucinervis. China. 

  • Cornus racemosa (Northern Swamp Dogwood or Gray Dogwood). Extreme southeast Canada and northeast U.S. 

  • Cornus rugosa (Round-leaf Dogwood). Southeast Canada and extreme northeast U.S. 

  • Cornus sanguinea (Common Dogwood). (syn. Swida sanguinea) is a species of dogwood native to most of Europe and western Asia, occurring north to southern England and southern Scandinavia, and east to the Caspian Sea.

  • Cornus sericea (C. stolonifera; Red Osier Dogwood). Northern North America. 

  • Cornus stricta (Southern Swamp Dogwood). Southeast U.S. 

  • Cornus walteri (Walter's Dogwood). Central China. 

  • Cornus wilsoniana (Wilson's Dogwood). Central China. 

 


Most species have opposite leaves, but alternate in a few. The fruit of all species is a drupe with one or two seeds. Flowers have four parts. Blood red shoots and crimson autumn leaves give its latin name Sanguinea

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Feeding and other inter-species relationships Associated with Cornus sanguinea:

 

bark

  • bark may house hibernating naked prepupa Allantus melanarius - a sawfly (Hymenoptera: Tenthredinidae)   Benson, R.B., 1952 

 

leaf

  • leaf is mined by larva Phytomyza agromyzina - a leaf-mining fly (Diptera: Agromyzidae)   Spencer, K.A., 1972 [mine linear, upper surface; frass in conspicuous black strips.] 

  • leaf is grazed by larva Allantus melanarius - a sawfly (Hymenoptera: Tenthredinidae)   Benson, R.B., 1952 

 

Shoot

  • decaying shoot may contain larva Rhynchites germanicus - Strawberry Rhynchites (Coleoptera: Attelabidae)   Morris, M.G., 1990 

 

hollow twig

  • hollow twig may house hibernating naked prepupa Allantus melanarius - a sawfly (Hymenoptera: Tenthredinidae)   Benson, R.B., 1952 

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Rotten wood

  • rotten wood may house hibernating naked prepupa Allantus melanarius - a sawfly (Hymenoptera: Tenthredinidae)   Benson, R.B., 1952 

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The young leaves are food for the caterpillars of green hairstreak and holly blue butterflies. Dogwoods are used as food plants by the larvae of some Lepidoptera species including Emperor Moth, The Engrailed, Small Angle Shades and the following case-bearers of the genus Coleophora: C. ahenella, C. salicivorella (recorded on Cornus canadensis), C. albiantennaella, C. cornella and C. cornivorella (The latter three feed exclusively on Cornus). Plants in this genus are notably resistant to honey fungus.

 

The berries are mildly toxic to people, though readily eaten by birds.

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