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 : 245-249

Passiflora subgenus Tryphostemmatoides (Harms) Killip

Fig. 4A–F

Passiflora subgenus Tryphostemmatoides (Harms) Killip ( Killip 1938: 24). — Passiflora section Tryphostemmatoides Harms ( Harms 1925: 500).

(6 spp.)

Taxonomic description

Vines slender to woody; monoecious; tendrils branched (2–4), adhesive disks present or absent; stipules minute (0.2–3 × 0.1–1 mm), sometimes deciduous; glands 0–2–4–6, at the petiole apex at the leaf-petiole junction; leaves simple, entire; main rib 1; ocelli absent; inflorescences 1- or 2-flowered, ending or not in a tendril, bracts 2–3, usually minute (0.5–2 × <0.1 mm), long in P. tryphostemmatoides (8–12 mm) and P. arbelaezii L.Uribe (5–13 mm), in which it can be wide (<5 mm), bracteoles present or absent; hypanthium shortly campanulate to campanulate; flowers greenish, yellowish-green, with corona banded white and yellow or yellow-orange, apex white; sepals 5; petals 5; corona with 1–3 series of filaments; operculum plicate, smooth, or laciniate, erect, membranaceous; nectariferous disk present (not described for P. nebulosae J.Restrepo & Ocampo ); limen cupuliform to anneliform, membranaceous; trochlea present or absent in most species, stamens 5; styles 3, stigmas 3; fruit a berry.

Pollen description

Pollen grains medium or large; isopolar; oblate, subprolate, or prolate-spheroidal; polar area very small; amb subcircular or subtriangular; 6-syncolporate or 6-colporate, colpi long and wide; endoapertures 3, lalongate, one for each pair of colpi, or endoapertures 6, circular, one for each colpus; pontopercula 3 and mesocolpia 3 or pontopercula 3 and pseudopercula 3; sexine semitectate (muri continuous, simplicolumellate, lumina small (0.5–2.3 µm); bacula absent). Sexine as thick as or less thick than nexine, total exine 2.1–3.0 µm ( Fig. 4A–F ).

Figures

Fig. 4. Pollen grains of Passiflora subgen. Tryphostemmatoides (Harms) Killip (A–F) and P. subgen. Tetrapathea (DC.) P.S.Green (G–O). A–F. P. tryphostemmatoides Harms (Idrobo, Pinto & Bischler 2874, MBM). G–J. P. aurantioides (K.Schum.) Krosnick (W. Takeuchi & D. Ama 16355, MO). K–O. P. tetrandra Banks ex DC. (K. Wood 28426, MO). Polar view (A–B, G–H, K), equatorial view (C–E, I, L–N), detail of ornamentation (F, J, O). Abbreviations: en = endoaperture; mes = mesocolpium; pt = pontoperculum; arrowheads = apertures. Scale bars: A–E, G, I, K– L = 10 µm; F, H, M–O = 5 µm; J = 1 µm.