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Genus Jacksonia Family Fabaceae
Subfamily Faboideae

Description: Shrubs or small trees, mostly leafless; branches and branchlets rigid, terete, angular or winged.

Leaves alternate, usually reduced to minute scales at nodes or occasionally a few 1-foliolate leaves present.

Flowers in terminal or lateral spikes or racemes or scattered along the branches; bracts and bracteoles small and scale-like, often caducous, bracteoles usually at the base of the calyx tube. Calyx tube very short, teeth valvate, the upper pair sometimes broader. Petals usually shorter than the calyx, shortly clawed; standard circular or reniform, apex emarginate; wings oblong; keel ± straight, broader than the wings. Stamens free. Ovary pubescent, sessile or stipitate; ovules usually 2; style subulate, incurved with a small terminal stigma.

Pod sessile or stipitate, ovate or oblong, flat or turgid; seeds without aril.

Distribution and occurrence: World: c. 40 species, endemic Australia. Australia: all States except S.A.

The occurrence ofJ. sternbergiana Huegel ex Benth. [J. clarkii F. Muell.] in N.S.W. is dubious.

Text by B. Wiecek
Taxon concept:

Taxa not yet included in identification key
Jacksonia chappilliae

 Key to the species 
1Erect shrubs or small trees 0.5–4.5 m high, branches erect or pendent; branchlets angular or winged; flowers in racemes in upper axils or scattered singly along branches.2
Decumbent or ascending shrubs to c. 0.5 m high; branchlets terete, longitudinally furrowed; flowers 1 or 2 in upper leaf axils.3
2Branchlets ± minutely pubescent, appearing grey-green; plants mostly 1.5–4.5 m high, branches erect or pendent; calyx pale grey-green, sometimes tinged red, 5–8 mm long; petals cream to orange-yellow, occasionally with red markings; pods 6–12 mm long, stipe 3–5 mm long; style 4–8 mm long, persistent in fruit; widespread species; (NC, CC, SC, NT, CT, NWS, CWS, NWP, SWP).Jacksonia scoparia
Branchlets glabrous, appearing green; plants mostly 0.5–2 m high, branches erect; calyx deep red, 3–4 mm long; petals red and yellow; pods 4–7.5 mm long, stipe 0.8–1.2 mm long; style 2–4 mm long; confined to the Woodenbong and Koreelah districts (NC).
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Jacksonia sp. 'Little Plain' (Williams 94233)
3Calyx teeth lanceolate to narrow-ovate, 1.5–2.5 mm wide, ± equal; pods ovoid, shortly stipitate, not concealed by calyx; inland species (NWP).Jacksonia rhadinoclona
Calyx teeth ovate to triangular, 3–4 mm wide, upper pair united for two-thirds of their length; pods sessile, concealed by calyx; coastal species
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Jacksonia stackhousei

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