Flora of the Hawaiian Islands
Dicotyledon Literature for Kadua st.-johnii
Wagner et al., 1990, 1999.
   Rubiaceae -- The Coffee Family Bibliography
      Kadua st.-johnii
General Information
Distribution In the Hawaiian Islands, endemic to Kaua`i.

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Succulent perennial herbs; stems slightly woody toward base, basal leafy portion decumbent, quadrangular, up to 3 dm long, epidermis corky, longitudinally grooved.
Leaves clustered toward base of stem, fleshy, upper surface dark green, glossy, lower surface somewhat glaucous, broadly ovate to broadly elliptic, 5.5-15 cm long, (2-)3.5-7.5 cm wide, lateral veins strongly ascending, scarcely anastomosing, higher order venation indistinct, lower surface very sparsely and minutely white scabrous, sessile or subsessile, stipules very broad, ca. 3-3.5 mm long, apex with a mucro ca. 1.5 mm long.
Flowers perfect, on scapes ca. 7-15 cm long in corymbose cymes, pedicels 5-18 mm long, cymes subtended by ovate-cordate bracts up to 5 cm long; hypanthium obscurely quadrangular, 0.5-0.8 mm long; calyx lobes foliaceous, broadly ovate, ca. 3-4 mm long and wide, becoming chartaceous and greatly enlarging to 8-11 mm long and nearly as wide in fruit; corolla green, fleshy, urceolate, the tube 5-8 mm long, about as long as wide, the limb subquadrangular in bud, apex depressed, the lobes ca. 4 mm long, inflexed in bud; stamens inserted near constricted neck of corolla, scarcely exserted; style pilose toward base, apex 4-lobed.
Capsules lenticular, ca. 2.5-3 mm long, ca. 7-8 mm wide, dehiscing loculicidally across disk, pyrenes tardily separating septicidally, mesocarp apparently dry, endocarp weakly sclerified, disk slightly raised.
Seeds dark brown to nearly black, irregularly angled, papillose to granulate.