Acacia johannis Pedley, Austrobaileya 5: 311 (1999)
Shrub to 2 m tall. Branchlets glabrous, reddish brown, lenticellate. Phyllodes narrowly elliptic, markedly falcate, 14–18 cm long, 5–10 mm wide, glabrous, acute with a callus point; longitudinal nerves 3 (or 4), prominent, with secondary nerves indistinct, forming open anastomoses; gland basal, prominent; pulvinus 1.5–2 mm long. Heads single or in pairs on short axillary axis, c. 50-flowered, lemon-yellow; peduncles glabrous, 14–20 mm long; basal bract minute. Flowers 5-merous; calyx c. 1.5 mm long, divided almost to base, ciliolate; corolla deeply divided, with lobes 1.8–2 mm long, glabrous; stamens 3–4 mm long; ovary glabrous. Pods shortly stipitate, linear, straight, 7–10 cm long, 4 mm wide at widest part, 2–3 mm at isthmuses, glabrous; valves chartaceous, constricted between seeds and raised over them, alternately on each valve. Seeds longitudinal, dark brown, depressed ellipsoidal, c. 3.5 mm long, 2.5 mm wide; aril terminal, clavate.
Restricted to NE Qld where common on Mt Mulligan, sometimes forming thickets. Occurs on rock outcrops and pavements and in shallow rocky soils derived from sandstone. Flowering material collected Feb. & Apr.; fruiting material Apr. & July.
Acacia johannis is most closely related to A. armillata , A. legnota and A. ommatosperma . It differs from A. armillata in its more elongate phyllodes with fewer prominent longitudinal nerves, longer peduncles and narrower pods raised over the somewhat smaller seeds; from A. legnota in its narrower, more elongate phyllodes with fewer longitudinal nerves, filiform peduncles and narrow pods raised over the seeds; and from A. ommatosperma in its less elongate phyllodes not widest near the tips, shorter peduncles and narrower pods.
Type of accepted name
Mt Mulligan, Cook District, Qld, 1654’S, 14451’E, 13 Apr. 1900, J.R.Clarkson 8217 ; holo: BRI; iso: K, MBA, MEL, MO, QRS.
Representative collections
Qld: Mt Pinnacle, SSW of Dimbulah, A.R.Bean 5578 & P.I.Forster (BRI, DNA); 3.3 km S of crossing of Shepherd Ck on Maytown track, J.R.Clarkson 9615 & P.Neldner (BRI, K, MBA, MEL, NSW, PERTH) ; Mt Mulligan, J.R.Clarkson 5805 (BRI, K, MBA, MEL, NSW, PERTH) ; Mt Mulligan, J.R.Clarkson 6927 (BRI, K, MBA, MEL, NSW, QRS).
(LP)
The information presented here originally appeared on the WATTLE CD-ROM which was jointly published by the Australian Biological Resources Study, Canberra, and the Department of Parks and Wildlife, Perth; it was produced by CSIRO Publishing from where it is available for purchase. The WATTLE custodians are thanked for allowing us to post this information here.
