Flora of the Hawaiian Islands
Dicotyledon Literature for Acacia mearnsii
Wagner et al., 1990, 1999.
   Fabaceae -- The Pea Family Bibliography
      Acacia mearnsii

Common name(s): black wattle
General Information
DistributionNative to New South Wales and Tasmania, Australia.In the Hawaiian Islands, naturalized on Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Kaho`olawe, Hawai`i.

Trees (shrubby when young) up to 50 m tall; branches densely minutely gray pubescent.
Leaves bipinnately compound, with 8-21 pairs of pinnae, leaflets 20-33 pairs in the lower pinnae, up to 40 pairs in the uppermost pinnae, linear-oblong, 1.5-4 mm long, 0.5-0.8 mm wide, with a nectary on the main rachis between or near each pair of pinnae.
Flowers ca. 1.8 mm long, in heads ca. 5 mm in diameter (excl. stamens), these arranged in terminal leafy panicles not exceeding the subtending leaves; corolla dark yellow; stamens ca. 3 mm long.
Pods oblong, somewhat moniliform, laterally flattened, constricted between all of the seeds, 7.5-10 cm long, 0.6-0.8 cm wide, sutures gray, pubescent.
Seeds ellipsoid, laterally flattened, 4-7 mm long, 3-6 mm in diameter.