Eucalyptus racemosa

Eucalyptus racemosa is a species of plant in the myrtle family ( Myrtaceae ). It occurs in central and northern part of the coast of New South Wales and southern part of the east coast of Queensland, where it is " Snappy Gum", " Scribbly Gum", "Narrow -leaved Scribbly Gum" or " White Gum " called.

Description

Appearance and leaf

Eucalyptus racemosa grows as a tree reaching heights of growth of up to 15 meters. The bark is smooth with scribbling, white, gray or yellow and peels off in short ribbons. The bark of young branches is green. Neither in the marrow of the young branches still in the bark, there are oil glands.

In Eucalyptus racemosa is available Heterophyllie. The leaves of seedlings are sitting in the first two to five pairs and then - as well as in young, middle-aged and adult specimens in petiole and leaf blade divided. The slightly different on top and bottom gray - green leaf blade of seedlings is elliptical with a length of 7 to 13,5 cm and a width of 1.6 to 4.5 cm, to broad - lanceolate. In young specimens which is in Eucalyptus racemosa subsp. rossii on top and bottom of the same color dull gray - green leaf blade at a length of 10 to 14 cm and a width of 2.5 to 4.5 cm wide, lanceolate to lanceolate. At middle-aged specimens, the leaf blade is at a length of 9 to 16 cm and a width of 2 to 2.8 cm wide, lanceolate to lanceolate, straight, entire, dull and gray-green. The petioles of adult specimens are 10-15 mm long. The on top and bottom of the same color glossy green leaf blades are elliptical in adult specimens with a length of 7 to 15 cm and a width of 0.8 to 1.5 cm, lanceolate to narrow - lanceolate, relatively thick, curved like a sickle, taper to Spreitenbasis back and have a pointed upper end. The barely visible lateral nerves go at large distances from an acute or very acute angle from the midrib. The cotyledons ( cotyledons ) are kidney-shaped.

Inflorescence and flower

Constantly on a page with a length of 7 to 12 mm and a width of up to 3 mm in cross section, narrow flattened or angular inflorescence stem are in a simple inflorescence 9-15 flowers together. The terete pedicels are 4-6 mm long. The non- blue-green floured or frosted flower buds are club-shaped with a length of 3 to 6 mm and a diameter of 2 to 5 mm. The sepals form a calyptra, which remains available until flowering ( anthesis ). Smooth hemispherical Calyptra is shorter than the length of the smooth flower cups ( Hypanthium ) and smaller than or as large as the latter. The flowers are white or off- white. The outer stamens are infertile ( infertile ). The flowering time of Eucalyptus racemosa subsp. rossii ranges from December to February.

Fruit and seeds

The fruit is stalked at a length of 4 to 5 mm and a diameter of 5 to 7 mm pear - or egg-shaped and vierfächrig. The disc is flat or slightly raised, the fruit trays are included, or on the height of the rim.

In Eucalyptus racemosa subsp. rossii is the brown or reddish-brown seed is pyramidal or near- pyramidal and the hilum terminal.

Occurrence

The natural range of Eucalyptus racemosa is the central and northern Küstenbabschnitt of New South Wales and the adjoining southern part of the coast of Queensland.

Eucalyptus racemosa is locally often in bright sclerophyllous forests on shallow, infertile, sandy soils over sandstone.

System

The first publication of Eucalyptus racemosa was in 1797 by Antonio José Cavanilles in Icones Plantarum et Descriptiones, Volume 4 ( 1), p 24 The specific epithet means racemosa grapey. The epithet rossii for the subspecies Eucalyptus racemosa subsp. rossii honors the teacher W. J. C. Ross ( 1850-1914 ).

From Eucalyptus racemosa Cav. There are two subspecies:

Eucalyptus racemosa Cav. subsp. racemosa, syn: Eucalyptus micrantha A.Cunn. ex DC. , Eucalyptus signata F.Muell. , Eucalyptus micrantha var haemastoma ( A.Cunn. ex DC. ) Benth., Eucalyptus haemastoma var capitata Maiden, Eucalyptus haemastoma var sclerophylla Blakely, Eucalyptus micrantha var signata (F. Muell. ) Blakely, Eucalyptus racemosa var signata ( F.Muell. ) RDJohnst. & Marryatt, Eucalyptus sclerophylla ( Blakely ) LASJohnson & Blaxell, Eucalyptus racemosa Cav. racemosa var racemosus and Eucalyptus Cav. orth var
Eucalyptus racemosa subsp. rossii ( RTBaker & DDWM. ) BEPfeil & Henwood, syn. Eucalyptus rossii RTBaker & DDWM.

Use

The wood of Eucalyptus racemosa subsp. rossii is quite brittle, and is used to a limited extent, for example for the construction of temporary fences. As firewood, it is not particularly suitable.

Genus

318639