Phyllodes present, often conspicuous; pitchers ventricose or essentially tubular, up to 50 cm long, outside with scattered bifid hairs and small glands, base attenuate, ventral wings paired, apical leaflet small (absent in H. macdonaldae Gleason), cup-shaped with narrow base, not covering the pitcher mouth, inside producing nectar. Inflorescences racemes; peduncle exceeding leaves; bracts foliaceous; bracteoles absent; pedicels slender and drooping or stout and erect, glabrous to densely pubescent. Flowers nodding; sepals 4(-6), petaloid, white to red, glabrous; petals absent; stamens 10-numerous, 1-cyclic, filaments stout, thick at base, anthers basifixed, sagittate, during anthesis reflexing from introrse to extrorse, dehiscing through upwardly directed, caudal appendages; pollen subglobose, ca. 30-35 x 20-25 μm, (3-)4-5-colporate, exine verruculate; ovary, 3(-4)-locular, densely covered with bifid hairs, style slender, cylindrical, glabrous, stigma shallowly truncately 3(-4)-lobed. Capsules splitting downwards in three parts, held together by the style; seeds ovoid, glabrous, irregularly scario-fimbriately winged, embryo small, embedded in copious endosperm. Chromosome number 2n = 42 (Maguire, 1978).
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