Flora of the Hawaiian Islands
Dicotyledon Literature for Pittosporum gayanum
Wagner et al., 1990, 1999.
   Pittosporaceae Bibliography
      Pittosporum gayanum

Common name(s): pittosporum, ha`awa, ho`awa
General Information
DistributionIn the Hawaiian Islands, endemic to Kaua`i.

Click here for detailed USGS map by Jonathan Price
Shrubs or small trees (1-)3-5 m tall, young parts and inflorescences very densely brown to reddish brown woolly tomentose; branches brown to reddish brown tomentose, occasionally glabrate.
Leaves coriaceous, strongly and coarsely rugose, obovate to oblong-obovate, (4.5-)9-30 cm long, (1.5-)3-10 cm wide, lateral veins 7-20 pairs, upper surface with conspicuously impressed veins, glabrate, lower surface with raised veins, densely brown to dark reddish brown woolly tomentose, occasionally becoming sparsely so, margins entire, usually revolute, apex broadly acute to short-acuminate, base attenuate, petioles (0.6-)1-3 cm long, usually narrowly winged.
Flowers unisexual, 5-15 in axillary or cauline, simple, corymbose inflorescences, peduncles 5-17 mm long, pedicels 2-9 mm long, bracts subulate, 2-10 mm long; calyx narrowly to broadly cup-shaped, sepals distinct, narrowly to broadly ovate, 4-6.5 mm long, brown tomentose, apex acute; petals white, 14-24 mm long; filaments 10-11 mm long, those of pistillate flowers ca. 6 mm long; fertile anthers 3-4.3 mm long, those of pistillate flowers ca. 1 mm long; ovary 2-carpellate.
Capsules broadly ovoid to subcuboid-ovoid, 18-25 mm long, brown to reddish brown tomentose when immature, glabrate at maturity, apex broadly acute, the persistent style 4-6 mm long, the valves with woody exocarp 2.7-4.7 mm thick, ± with a median ridge or furrow, the surface rugose-tuberculate, the troughs between the convolutions narrow and sometimes obscured, seed mass filling the capsule volume.
Seeds ca. 17, black to reddish black, irregularly angled and compressed, 5-7 mm long.