WorldFloraDB - Acacia dunnii

Characteristics

Pruinose shrub or tree to 6 m high. Branchlets terete, glabrous. Phyllodes inequilaterally elliptic to ovate, shallowly falcate, 12–42 cm long, 6–17.5 cm wide, very unequal at base, 2–4-times crenate on upper margin, obtuse, coriaceous, glabrous, with 4 or 5 prominent longitudinal veins confluent with lower margin at base, closely reticulate between main veins. Inflorescences in terminal or axillary panicles 11–50 cm long; peduncles 8–20 mm long, single or fascicled, glabrous; heads globular, 6–8 mm diam., 50–85-flowered, golden. Flowers 5-merous; sepals ¼–½-united. Pods narrowly oblong, straight, to 17 cm long, 2–4 cm wide, subwoody, coarsely reticulate. Seeds transverse, broadly elliptic to oblong-elliptic, 9–12 mm long, subnitid, brown with brown-black periphery; aril apical.

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An evergreen tree. It grows up to 2-7 m tall and about 2-4 m wide. The stem is slender and erect. It has few branches. The stem grows from a woody swelling which has dormant buds. The leaves (phyllodes) are silvery blue. They are broad and sickle shaped. They are 12-30 cm across. They look like an elephant's ear. They have 3 or 4 clearly seen veins which run along the leaf. These leaves can also grow on the trunk and last for many years. These leaves hang vertically. The leaves are used to wrap food. The flowers are dense golden or yellow balls. They are 1-2 cm across. They occur in flower clusters at the ends of branches. The pods are brown. They are woody pods 10-13 cm long and 2.5-3 cm across. They are flat. The pod is constricted between the seeds. The seeds are 1.2 cm long.

Life form	perennial
Growth form	tree
Growth support	free-standing
Foliage retention	evergreen
Sexuality	hermaphrodite
Pollination	-
Spread	-
Mature width (meter)	-
Mature height (meter)	4.0 - 6.5
Root system	-
Rooting depth (meter)	-
Root diameter (meter)	-
Flower color	-
Blooming months	-
Fruit color	-
Fruiting months	-
Nitrogen fixer	rhizobia
Photosynthetic pathway	-

Environment

It occurs in northern Australia. It is a tropical plant. It does best in light well drained soil. An open sunny position suits it. It is drought resistant. It is sensitive to cold. It suits hardiness zones 9-11.

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Grows in gravelly soil, often on rocky slopes.

Light	-
Soil humidity	-
Soil texture	-
Soil acidity	-
Soil nutriment	-
Hardiness (USDA)

Usage

Food use needs checking.

Uses	-
Edible	leaves
Therapeutic use	-
Human toxicity	-
Animal toxicity	-

Cultivation

It is grown from seed. The seed need treatment to break the hard seed coat. Normally this is by putting the seeds in very hot water and letting the water cool down overnight then planting the seeds immediately. The seeds germinate rapidly after treatment.

Mode	seedlings
Germination duration (days)	21
Germination temperacture (C°)	21 - 26
Germination luminosity	-
Germination treatment	soaking
Minimum temperature (C°)	-
Optimum temperature (C°)	-
Size	-
Vigor	-
Productivity	-