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Published In: The Gardeners Dictionary...Abridged...fourth edition vol. 1. 1754. (28 Jan 1754) (Gard. Dict. Abr. (ed. 4)) Name publication detail

Project Name Data (Last Modified On 6/2/2011)
Acceptance : Accepted
Project Data     (Last Modified On 6/3/2011)
General/Distribution: A genus with about 900 species; distributed mainly in tropics and subtropics, especially in Africa and Australia.


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Trees, shrubs, rarely herbs, often prickly or spinose. Leaves bipinnate; leaflets small and numerous or leaves reduced to phyllodes; petiolar glands often present; stipules generally spinescent. Inflorescence cylindric spike or globose head; peduncle solitary axillary or fasciculate or paniculate at the end of branches; bracts often two, scale like, situated on the peduncle at various levels. Flowers small, 3-5-merous, bisexual or plants polygamous. Calyx campanulate, dentate, lobed or polysepalous. Petals usually more or less united, rarely absent. Stamens indefinite, free or shortly and irregularly connate at the base; anthers small, eglandular. Ovary sessile or stipitate, with 2 or more ovules. Fruit ovate to linear, straight, arcuate or contorted, membranous to woody, rarely articulated or moniliform. Seed large, with a filiform funicle or fleshy aril.

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1 Mature plants with phyllodes (2)
+ Mature plants with normal leaves (6)
2 (1) Inflorescence a spike (3)
+ Inflorescence a head (4)
3 (2) Phyllodes almost straight, 1 cm or less broad; fruit straight. Acacia aneura
+ Phyllodes curved, 1.5-5 cm broad; fruit circinately coiled Acacia auriculiformis
4 (2) Phyllode with a prominent midrib Acacia saligna
+ Phyllode without any midrib (a number of veins present, running parallel to the longitu-dinal axis of the phyllode) (5)
5 (4) Phyllode 12 mm or less wide; fruit c. 3-4 mm broad, slightly torulose Acacia homalophylla
+ Phyllode c. 1-2.5 cm wide, fruit c. 8 mm broad, not torulose Acacia melanoxylon
6 (1) Inflorescence a spike (7)
+ Inflorescence a head (12)
7 (6) Spiny stipules very thick and horny Acacia cornigera
+ Spiny stipules slender (8)
8 (7) Pod bright orange Acacia albida
+ Pod not bright orange (9)
9 (8) Pinnae 10 pairs or more (calyx and corolla villous Or pubescent) Acacia catechu
+ Pinnae 5 pairs or fewer (10)
10 (9) Prickles in threes; pinnae 3-5 pairs Acacia senegal
+ Prickles in twos; pinnae 2-3 pairs (11)
11 (10) Corolla 3 times the size of calyx; pod ensiform, not beaked Acacia mellifera
+ Corolla 2 times the size of calyx; pod beaked, (base attenuated into a distinct stipe.) Acacia modesta
12 (6) Internodes provided with prickles (13)
+ Internodes without prickles (14)
13 (12) Flower heads in bud glabrous; young pod pubescent but not velvety Acacia gageana
+ Flower heads in bud pubescent; young pod velvety Acacia torta
14 (12) Stipules not spiny, (leaf stalk decurrent) (15)
+ Stipules spiny (16)
15 (14) Leaflets 5-12 mm long Acacia decurrens
+ Leaflets 1.5-4 mm long Acacia mearnsii
16 (14) Spiny stipules become very thick and horn-like (17)
+ Spiny stipules do not become thick and horn-like (19)
17 (16) Young branches without glands Acacia sphaerocephala
+ Young branches with numerous reddish sessile glands (18)
18 (17) Pairs of spines (ant galls) neither fused together nor bilobed Acacia seyal Delile var. seyal
+ Pairs of spines fused at the base into ant galls, often bilobed Acacia seyal var. fistula
19 (16) Heads generally terminal, paniculate Acacia leucophloea
+ Heads axillary, pedunculate (20)
20 (19) Ovary pilose (21)
+ Ovary glabrous (28)
21 (20) Pod contorted or spirally twisted Acacia tortilis
+ Pod not spirally twisted (22)
22 (21) Fruit straight margined, falcate or slightly crenate (27)
+ Fruit moniliform (23)
23 (22) Pod narrowly and regularly constricted between seeds (25)
+ Pod not narrowly and regularly constricted between seeds (24)
24 (23) Pod slightly constricted between seeds
+ Margins of pod straight or slightly crenate
25 (23) Plant cupressiform in appearance
+ Plant not cupressiform in appearance (26)
26 (25) Pod whitish or grey tomentellous
+ Pod glabrous, not tomentellous
27 (22) Plant not hemispherical Acacia sieberiana
+ Plant hemispherical
28 (20) Peduncle without a distinct joint (29)
+ Peduncle with a distinct joint (30)
29 (28) Pod hard woody and swollen, with a curved beak-like structure at the tip Acacia farnesiana
+ Pod flat, papery, with only an apical curved mucro Acacia filicioides
30 (28) Pod short and broad, 5-7.5 cm long, c. 8-17 mm broad, sutures straight Acacia jacquemontii
+ Pod long and narrow, 7.5-15.0 cm long. c. 5-9.0 mm broad, sutures undulate (31)
31 (30) Peduncle c. 2.5 cm long; pinnae 2-8 pairs Acacia eburnea
+ Peduncle c. 1.0-1.8 cm long; pinnae 1-4 pairs Acacia hydaspica
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