Description

Key Characters:

Growth Form: Erect perennial herbs.

Stems: Stems densely antrorsely strigose, becoming hirsute and glandular hirsute toward and throughout the inflorescence (hairs straight or slightly curved, 0.1–0.6 mm long).

Roots:

Leaves: Leaves simple. Opposite. Blades ovate to broadly ovate, (15–)19–33 cm long, (6–)7.5–15.3 cm wide. Apex acuminate. Base truncate to rounded or subcordate. Surfaces less pubescent than P. parviflora var. parviflora; blades rugose. Margins crenate. Petioles (5–)6–13.5 cm long, densely antrorsely strigose (in Wai'anae Mts. hairs usually spreading). Stipules absent.

Flowers: Flowers (4)6 per verticillaster, in leafless, racemose usually unbranched inflorescences usually 15–20 cm long, pedicels (5–)8–15 mm long, with few glandular hairs, bracts narrowly ovate to elliptic–ovate, 6–9 mm long. Calyx campanulate, 3–6 mm long, enlarging in fruit , nerves conspicuous, short–hirsute, glandular hirsute, and glandular–dotted, usually 5-toothed, the teeth narrowly deltate to linear–deltate or linear–elliptic, 1.5–3 mm long, apex attenuate to acute, splitting longitudinally, usually persistent or sometimes only ventral 1/2 persistent. Corolla bilabiate, white, purple–tinged, tube narrowly funnelform, curved, ca. 9–13 mm long, glandular–dotted, short–hirtellous, and ± glandular hirtellous, upper lip ca.2.5–3 mm long, entire or 2-lobed, flat or concave, lower lip ca. 6–9 mm long, 3-lobed, lateral lobes ovate, slightly asymmetrical, lower lobe broadly ovate to suborbicular, slightly folded to form a groove, margins somewhat undulate, apex emarginate or entire; nectary disk often present at base of ovary, annular or developed on anterior side only. Stamens 4, both pairs of similar length or upper pair slightly longer, ascending the upper corolla lip, included, aligned with the sinuses; filaments inserted near throat, usually pubescent; anthers dithecal, opening by longitudinal slits; anther sacs divaricate. Ovary superior, 2-carpellate, placentation basal-axile; ovules 1 per ovary lobe; style 1, included, arising between lobes, shortly 2-lobed, the lobes clavate; stigmatic only at apex, 1 lobe often rudimentary; stigmas 2.

Fruit: Nutlets ca. 3–6 mm long; 1-seeded; dark green to black; drupaceous; exocarp fleshy; obovoid; margins slightly winged; obliquely attached at the connate base; spreading and exserted from calyx at maturity. Seeds with endosperm absent or scanty and oily.

Ploidy:

Habitat: Occurring in diverse mesic forest to wet forest.

Elevation Range: 500–730 m.