Passiflora

Passiflora subgenus Tetrapathea (DC.) P.S.Green Fig. 4G–O Passiflora subgenus Tetrapathea (DC.) P.S.Green (Green 1972: 552). — Passiflora section Tetrapathea DC. (de Candolle 1822: 435). (3 spp.) Taxonomic description Vines slender to woody; dioecious plants, with differences in the size of the gynoecium and/or androecium and/or in the number of parts of the gynoecium and presence/absence of nectariferous disk between plants of different sex; tendrils entire, adhesive disks absent; stipules minute (0.25–3 × 0.25–1 mm); glands 0–2(–4) on the lower half or third of the petiole; leaves simple, entire; ocelli present; main rib 1; inflorescences with (1)2–4(5) axes, 2–6(8–16)-flowered (rarely 1-flowered); bracts 2, small (1–2(4) × 0.25–1 mm), bracteoles absent; hypanthium flat; flowers whitish to whitish-greenish, with corona whitish to yellow or whitish-greenish; sepals (3)4 or (4)5, petals (3)4 or (4)5; corona with 2 series of filaments; operculum absent or present, when present, erect, membranaceous, apex fimbriate; nectariferous disk present, absent only in male flowers of P. tetrandra; limen present or absent; trochlea absent, stamens 4 or variable number, (3)4–5 or 6–8, between species; styles 2–7, stigmas 2–7, variable within and between species; fruit a berry. Pollen description Pollen grains medium or large; isopolar; subprolate; polar area very small; amb subcircular; 6-colporate; colpi long to very long and wide; endoapertures 3, lalongate, one for each pair of colpi; pontopercula 3, mesocolpia 3; sexine semitectate (muri continuous, simplicolumellate, or duplicolumellate; lumina small (4.2–8.0 µm); bacula present). Sexine as thick as or thicker than nexine, total exine 2.1–4.2 µm (Fig. 4G–O).