Eucalyptus robusta

Eucalyptus robusta

Common names: Swamp mahogany, Swamp messmate 大葉桉

　

General Description

Leaf

Juvenile leaf

Size 7 to 13 x 5 to 6 cm

Length of leaf stalk 2 to 3 cm

Locates opposite for 3 or 4 pairs. Alternate, lanceolate.

Adult leaf

Size 10 to 20 x 4 to 8 cm

Leaves are alternate, simple, lanceolate.

Leaf apex has a long fine point, base obtuse or acute, often unequal, margin entire.

Texture of leaves is rather leathery, surface is smooth, vein are closed together, almost parallel, at an angle of 50-60 to the midrib.

A vein just within, and close to the margin is usually obvious.

　

Flower

Flowering period September

Flower stalk length 1 to 1.5cm

Flower size 2 cm across

Colour white changing to yellow

Sex bisexual

Flowers in umbels of up to 10 flowers in the leaf axils, the inflorescence stalk flattened.

Flowers are regular, copious nectar with bee-keepers, numerous stamens, which is the most conspicuous part of the flower; ovary inferior, 3 to 6-celled with numerous ovules in each cell, style single, arising at the center of the nectar producing tissue which covers the top of the ovary.

　

Fruit

Size 1 x 1.2 cm

Woody capsule, more or less cylindrical.

Opening at the top by valves which covers the top of the ovary.

　

Trunk

With a fibrous brown bark persistent on the trunk and branches, typically straight and about half the height of the mature tree.

Additional information

pH value of soil
5 - 6

Remarks fast-growing, evergreen

Juvenile leaf
Size	7 to 13 x 5 to 6 cm
Length of leaf stalk	2 to 3 cm
Locates opposite for 3 or 4 pairs. Alternate, lanceolate.
Adult leaf
Size	10 to 20 x 4 to 8 cm
Leaves are alternate, simple, lanceolate. Leaf apex has a long fine point, base obtuse or acute, often unequal, margin entire. Texture of leaves is rather leathery, surface is smooth, vein are closed together, almost parallel, at an angle of 50-60 to the midrib. A vein just within, and close to the margin is usually obvious.

Flowering period	September
Flower stalk length	1 to 1.5cm
Flower size	2 cm across
Colour	white changing to yellow
Sex	bisexual
Flowers in umbels of up to 10 flowers in the leaf axils, the inflorescence stalk flattened. Flowers are regular, copious nectar with bee-keepers, numerous stamens, which is the most conspicuous part of the flower; ovary inferior, 3 to 6-celled with numerous ovules in each cell, style single, arising at the center of the nectar producing tissue which covers the top of the ovary.