Jacquemontia Choisy

Convolvulaceae, B. Verdcourt (East African Herbarium). Flora of Tropical East Africa. 1963

Morphology General Habit

Twining or prostrate herbs or shrubs, rarely erect, mostly hairy (often stellately in extra-African forms)

Morphology Reproductive morphology Flowers

Flowers in axillary, usually peduncled cymes, or capitate or solitary; inflorescences usually bracteate

Morphology Reproductive morphology Flowers Calyx

Sepals 5, equal or unequal with the 2 outer ones often large

Morphology Reproductive morphology Flowers Corolla

Corolla funnel-shaped,obscurely lobed

Morphology Reproductive morphology Flowers Androecium Stamens

Stamens and style included

Morphology Reproductive morphology Flowers Gynoecium Pistil

Ovary 2-locular, 4-ovuled; style simple, filiform; stigmas 2, elliptic or oblong, rarely globose or filiform

Morphology Reproductive morphology Fruits

Capsule globose, 2-locular, 4-seeded

Distribution

A large genus of about 120 species, mainly American, a few in tropical Africa, Asia and Australia

Note

This genus is very close to Convolvulus and there is no universal distinguishing character. Since however the species are mostly extra-African it would not be wise to sink the genus after study of only a few species.

Wood, J.R.I., Clegg, R. Jacquemontia (Convolvulaceae) in Bolivia and Peru. Kew Bull 76, 375–420 (2021). DOI: https://doi.org/10.1007/s12225-021-09936-5

Morphology General Habit

Herbs or subshrubs, perennial in Bolivia and Peru (except Jacquemontia gracillima Hallier f.); stems trailing, decumbent, twining or erect; indumentum commonly of branched hairs

Morphology Leaves

Leaves entire, oblong to ovate; inflorescence usually cymose but often contracted and subcapitate; sometimes racemose or loosely paniculate; calyx of five free sepals, sepals subequal or unequal, the two outer differing from the two innermost

Morphology Reproductive morphology Flowers Corolla

Corolla blue or white (rarely pale pink), broadly funnel-shaped, glabrous on the exterior; stamens 5, included or very shortly exserted, white; pollen mostly pantocolpate, rarely tricolpate (J.nodiflora (Desr.) G.Don and J.sphaerocephala Meisn.); style 1; stigmas 2, ellipsoid to oblong, straight or bent, somewhat flattened, exceeding anthers; ovary bilocular, 4-ovulate

Morphology Reproductive morphology Fruits

Capsule usually 4 – 8-valved, subglobose, glabrous; seeds glabrous, often verruculose, occasionally weakly winged.

Phenology

Most species flower during and just after the end of the rainy season so the best time to find species of Jacquemontia in flower is in the February – June period. There are exceptions: J. gabrielii is a winter flowering species, which grows in moist forest, while J. selloi (Meisn.) Hallier f. flowers in spring after its grassy cerrado habitat is burnt.

Convolvulaceae, Maria Leonor Gonçalves. Flora Zambesiaca 8:1. 1987

Morphology General Habit

Herbaceous to woody twining or prostrate herbs or shrubs, rarely erect, mostly hairy, with 2–3-armed hairs.

Morphology Leaves

Leaves variable, entire often cordate at the base.

Morphology Reproductive morphology Inflorescences

Inflorescences usually bracteate.

Morphology Reproductive morphology Flowers

Flowers in axillary usually pedunculate cymes, or capitate or solitary; bracteoles small, linear to lanceolate or the outer ones larger, foliaceous; pedicels very short or flowers sessile.

Morphology Reproductive morphology Flowers Calyx

Sepals 5, equal or unequal with the 2 outer ones often large.

Morphology Reproductive morphology Flowers Corolla

Corolla small to medium-sized, funnel-shaped or campanulate, blue, mauve or pink, rarely white, obscurely 5-lobed; midpetaline areas distinct.

Morphology Reproductive morphology Flowers Androecium Stamens

Stamens included; filaments linear; anthers oblong; pollen smooth.

Morphology Reproductive morphology Flowers Disc

Disk small or absent.

Morphology Reproductive morphology Flowers Gynoecium Pistil

Ovary bilocular, 4-ovuled; style simple, filiform, included; stigmas 2, elliptic or oblong, more or less flattened, rarely globose or filiform.

Morphology Reproductive morphology Fruits

Capsule globose, bilocular, 4-seeded or less by abortion.

Morphology Reproductive morphology Seeds

Seeds usually glabrous.

George R. Proctor (2012). Flora of the Cayman Isands (Second Edition). Royal Botanic Gardens, Kew

Morphology General Habit

Trailing or twining vines, herbaceous or subwoody; leaves usually entire, sometimes toothed or lobed

Morphology Reproductive morphology Flowers

Flowers axillary in small, stalked, umbel-like cymes or heads; sepals 5, equal or unequal; corolla white, blue or violet, bell-shaped or somewhat rotate, the limb 5-angled

Morphology Reproductive morphology Flowers Androecium Stamens

Stamens 5, mostly shorter than the corolla, the filaments sometimes dilated at the base

Morphology Reproductive morphology Flowers Gynoecium Ovary

Ovary 2-celled, each cell with 2 ovules; style filiform, with 2 stigmas

Morphology Reproductive morphology Fruits

Capsule globose, 2-celled, 4-seeded; seeds glabrous, tuberculate or hairy.

Distribution

A pantropical genus of about 60 species.