Passiflora

Mezzonato-Pires, Ana Carolina, Bernacci, Luís Carlos, Teixeira, Gabriel Henrique Gomes De Souza Freitas, Cruz, Priscila de Freitas, Pacheco, Georgia, Mendonça, Cláudia Barbieri Ferreira & Gonçalves-Esteves, Vania, 2025, Palynological characterization and taxonomical delimitation of the subgenera within Passiflora L. (Passifloraceae: Malpighiales), the largest genus of lianas in the Neotropics, European Journal of Taxonomy 981, pp. 239-264 : 252

Passiflora subgenus Decaloba (DC.) Rchb.

Figs 10–11

Passiflora subgenus Decaloba (DC.) Rchb. ( Reichenbach 1828: 132). — Passiflora section Decaloba DC. (de Candolle 1822: 435).

(244 spp.)

Taxonomic description

Vines slender; monoecious; tendrils present, entire, adhesive disks absent; stipules minute; glands 2, present or absent on the petiole; leaves simple, entire, or 2–3-lobed in most species; ocelli present or absent; main ribs 3; inflorescences 1-flowered, 2-flowered, or cymose; bracts 3, minute, bracteoles absent; hypanthium flat; flowers yellow-green to white or reddish, corona with red or purplish bands; sepals 5; petals 0 or 5; corona with 1 or 2 series of filaments; operculum plicate; nectariferous disk present or absent; limen annular, lobulate, recurved, or cuculiform; trochlea absent, stamens 5; styles 3, stigmas 3; fruit a berry or a fleshy capsule ( Fig. 10).

Pollen description

Pollen grains medium to large; isopolar; subprolate, oblate-spheroidal, prolate, or prolate-spheroidal; polar area very small or small; amb circular; 6-colporate, 12-colporate, or 12-colpate; colpi long and narrow or wide; endoapertures 0, 6, or 12, lolongate (in most species), lalongate or circular; opercula 0, 3, 6, or 12, pseudopercula 0, 3, or 6, pontopercula 0 or 3, and/or mesocolpia 3 or 6; sexine semitectate (muri continuous, simplicolumellate; lumina small (0.7–8.7 µm); bacula present or absent). Sexine thicker than nexine, total exine 1.0–5.6 µm ( Fig. 11).