Flora of the Hawaiian Islands
Literature for Psychotria hawaiiensis
Wagner et al., 1990, 1999. Literature for Psychotria hawaiiensis var. hillebrandii
Wagner et al., 1990, 1999. Literature for Psychotria hawaiiensis var. scoriacea
Wagner et al., 1990, 1999.
   Rubiaceae -- The Coffee Family Bibliography
      Psychotria hawaiiensis
General Information
Trees up to 12 m tall; branches grayish, reddish, or yellowish brown.
Leaves chartaceous to coriaceous, elliptic, obovate to orbicular, 2.5-20.5 cm long, 2-9 cm wide, lateral veins 5-13 pairs, glabrous to pubescent, ± with domatia in vein axils, apex obtuse to rounded, sometimes with a short abrupt point, base acuminate, acute, obtuse, or nearly truncate, petioles 0.5-4.7 cm long, stipules broadly ovate to obovate, up to 8 mm long, usually glabrous but with a flattened patch of bristle-like hairs in the axil.
Flowers functionally unisexual, 4-5-merous, inflorescences with verticillate branching, the branches usually verticillately branched again, and the secondary branches again branched, the ultimate branches terminated by a 3-flowered cymule, peduncles 1-7.5 cm long, terminal flower of each cymule sessile, lateral ones often on short pedicels, inflorescence axes reddish, yellowish brown, or whitish pubescent, sometimes densely so, or glabrous; calyx 2-3 mm long, somewhat dilated toward apex, glabrous or pubescent, truncate or with very small obtuse lobes; corolla tube 1-2 mm long at anthesis, slightly or not dilated toward apex, throat glabrous or occasionally pubescent, the lobes usually thick, ovate, 1.6-3 mm long at anthesis, reflexed; filaments of staminate flowers ca. 1 mm long; anthers attached at base, oblong-ovate, ca. 1 mm long; ovary 1.2-2 mm long; style 1.5-2.2 mm long; stigmas divaricate, up to 1.5 mm long, glabrous or pubescent.
Fruit ovoid or obpyriform, glabrous or pubescent, 6-8(-10) mm long, including the collar-like persistent calyx at apex and the persistent disk, disk ± protruding from calyx, pyrenes hemispherical in cross section, with T-shaped invaginations of the seed coat on the ventral surface.