Rahul Sharma (Editor)

Cornus alternifolia

Updated on
Edit
Like
Comment
Share on FacebookTweet on TwitterShare on LinkedInShare on Reddit
Kingdom
  
Plantae

Family
  
Cornaceae

Subgenus
  
Mesomora

Higher classification
  
Dogwood

Order
  
Cornales

Genus
  
Cornus

Scientific name
  
Cornus alternifolia

Rank
  
Species

Cornus alternifolia CornusalternifoliaDistantHillGardensCCBYNCNDjpg

Similar
  
Dogwood, Cornus sericea, Cornus racemosa, Cornus controversa, Flowering dogwood

Cornus alternifolia


Cornus alternifolia is a species of flowering plant in the dogwood family Cornaceae, native to eastern North America, from Newfoundland west to southern Manitoba and Minnesota, and south to northern Florida and Mississippi. It is rare in the southern United States. It is commonly known as green osier, alternate-leaved dogwood, and pagoda dogwood.

Contents

Cornus alternifolia CornusalternifoliaargenteapeganumCCBYSAjpg

Cornus alternifolia argentea wedding cake tree


Description

Cornus alternifolia Pagoda Dogwood Cornus alternifolia in Hamilton Burlington

It is a small deciduous tree growing to 25 feet (8 m) (rarely 30 feet (9 m)) tall, with a trunk up to 6 inches (152 mm) in diameter. The branches develop characteristic horizontal layers separated by gaps, with a flat-topped crown. Its leaves are elliptic to ovate and grow to 2–5 inches (51–127 mm) long and 1–2 inches (25–51 mm) broad, arranged alternately on the stems, not in opposite pairs typical of the majority of Cornus species. The leaves are most often arranged in crowded clusters around the ends of the twigs and appear almost whorled. The upper sides of the leaves are smooth and green, while the undersides are hairy and a bluish color. The bark is colored gray to brown, becoming ridged as it ages. Small cream colored flowers are produced, with four small petals. The flowers are grouped into cymes, with the inflorescences 2–5 inches (51–127 mm)2-5 across. It bears berries with a blackish blue color.

Cornus alternifolia Cornus alternifolia Landscape Trees Pinterest

  • Bark: Dark reddish brown, with shallow ridges. Branchlets at first pale reddish green, later dark green.
  • Wood: Reddish brown, sapwood pale; heavy, hard, close-grained. Sp. gr., 0.6696; weight of cu. ft., 41-73 lbs.
  • Winter buds: Light chestnut brown, acute. Inner scales enlarge with the growing shoot and become half an inch long before they fall.

    • Cornus alternifolia httpsuploadwikimediaorgwikipediacommonsthu

  • Leaves: Alternate, rarely opposite, often clustered at the ends of the branch, simple, three to five inches long, two to three wide, oval or ovate, wedge-shaped or rounded at base; margin is wavy toothed, slightly reflexed, apex acuminate. They come out of the bud involute, reddish green above, coated with silvery white tomentum beneath, when full grown are bright green above, pale, downy, almost white beneath. Feather-veined, midrib broad, yellowish, prominent beneath, with about six pairs of primary veins. In autumn they turn yellow, or yellow and scarlet. Petioles slender, grooved, hairy, with clasping bases.
  • Flowers: April, May. Perfect, cream color, borne in many-flowered, broad, open cymes, at the end of short lateral branches.
  • Calyx: The cup-shaped flowers have four petals that are valvate in bud, unwrapping when in bloom with cream colored, oblong shaped petals with rounded ends. The petals are inserted on disk and the stamens are inserted too and arranged alternately to the petals, being four in number also. The stamens are exserted with filaments long and slender. Anthers oblong, introrse, versatile, two-celled; cells opening longitudinally.
  • Pistil: Ovary inferior, two-celled; style columnar; stigma capitate.
  • Fruit: Drupe, globular, blue-black, 0.3 in (8 mm) across, tipped with remnant of style which rises from a slight depression; nut obovoid, many-grooved. October.

    • Habitat

    Cornus alternifolia Cornus alternifolia Wikipedia

    C. alternifolia is found under open deciduous trees, as well as along the margins of forests and swamps. These trees prefer moist, well drained soil.

    Cornus alternifolia Alternateleaved Dogwood Cornus alternifolia

    Seedlings are shade-tolerant and it is often found as an understory tree in mature forests, such as those dominated by Acer saccharum (sugar maple) or Populus (aspen). It is also common in younger forests.

    Ecology

    The fruits provide food for at least eleven species of birds and the black bear. The leaves and bark are eaten by white-tailed deer, beaver, and cottontail rabbit.

    Use

    The tree is regarded as attractive because of its wide-spreading shelving branches and flat-topped head, and is often used in ornamental plantings. The flower clusters have no great white involucre as have those of the flowering dogwood, and the fruit is dark purple instead of red.

    The cultivar 'Argentea' (silver pagoda dogwood) has gained the Royal Horticultural Society's Award of Garden Merit.

    C. alternifolia is susceptible to golden canker (Cryptodiaporthe corni), particularly when drought-stressed or heat-stressed. Proper siting of the plant in partial to full shade, along with adequate mulch and water, will reduce the incidence of this pathogen.

    Cornus alternifolia has been used in the traditional Chinese medicine as tonic, analgesic, and diuretic.

    References

    Cornus alternifolia Wikipedia
    (Text) CC BY-SA


    Similar Topics