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This genus is accepted, and its native range is S. Mexico to Tropical America.
Schwenckia

[FTEA]

Solanaceae, Jennifer M Edmonds. Oliganthes, Melongena & Monodolichopus, Maria S. Vorontsova & Sandra Knapp. Flora of Tropical East Africa. 2012

Morphology General Habit
Annual or perennial herbs, sometimes shrubby or small trees; hairs simple with eglandular or glandular heads
Morphology Leaves
Leaves usually alternate
Morphology Reproductive morphology Inflorescences
Inflorescences manyflowered monochasial racemose or lax paniculate cymes, axillary or terminal subtended by small bracts, pedunculate; flowers solitary or in pairs or triplets, actinoor slightly zygomorphic; pedicels usually erect, occasionally deflexed in fruit
Morphology Reproductive morphology Flowers Calyx
Calyx tubular to campanulate, with 5 calyx lobes, often unequal
Morphology Reproductive morphology Flowers Corolla
Corolla tube narrow and straight, rarely curved, broadening into 5 complex small lobes which often 3- or 2lobed usually alternating with 5 clavate appendages
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens didynamous or reduced to two with two or three staminodes; filaments fused to corolla tube at different levels, filiform or compressed, becoming thicker at point of fusion, glabrous or pilose; fertile anthers ovoid or narrowly ellipsoid, always ventrifixed, dehiscing extrosely, thecae often unequal, staminodes devoid of vestigial anthers
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary ovoid, glabrous, 2-locular, ovules numerous; disc annular or cupulate; style filiform, glabrous, usually exserted; stigma capitate or discoidal, inconspicuous
Morphology Reproductive morphology Fruits
Fruit a smooth, globose to ovoid, many-seeded capsule, bivalvate with entire smooth valves, usually longer than persistent fruiting calyx
Morphology Reproductive morphology Seeds
Seeds numerous, small, reticulate.
Note
Linnaeus (1764) unintentionally described the genus as Schwenkia, while giving the binomial Schwenckia americana after the generic description, leading to the frequent mis-spelling of this generic name (cf. Heine, 1963). Variously considered to be composed of between 5 and 30 species, Hunziker (2001) considered the genus to consist of around 25 species, which occur from Central America and the Antilles to NE Argentina. The type species S. americana L. is the commonest species and now occurs as a widespread weed throughout tropical Africa.

[FZ]

Flora Zambesiaca. Vol. 8, Part 4. Solanaceae. Gonçalves AE. 2005

Morphology Leaves
Leaves alternate, or in clusters, petiolate or sessile, entire Leaves alternate, or in clusters, petiolate or sessile, entire.
Morphology Reproductive morphology Inflorescences
Cymes few–many-flowered, terminal, usually laxly paniculiform, occasionally reduced to one flower; pedicels slender Cymes few–many-flowered, terminal, usually laxly paniculiform, occasionally reduced to one flower; pedicels slender.
Morphology Reproductive morphology Flowers
Flowers somewhat zygomorphic Flowers somewhat zygomorphic.
Morphology Reproductive morphology Flowers Calyx
Calyx shorter than the corolla tube, tubular or campanulate, 4(5)-lobed, not or slightly enlarged in fruit; lobes subequal, short, claviform, with valvate aestivation Calyx shorter than the corolla tube, tubular or campanulate, 4(5)-lobed, not or slightly enlarged in fruit; lobes subequal, short, claviform, with valvate aestivation.
Morphology Reproductive morphology Flowers Corolla
Corolla tubular or elsewhere sometimes saccate, violet to reddish, yellowish or white; tube elongate, narrow but often slightly dilated at the anther-level, not expanded at the throat, sparingly pubescent on the lower third inside; limb small, plicate, oblique, 5-lobed or -dentate, occasionally 2-lipped; lobes claviform to setaceous, sometimes emarginate, overlapping in bud, with valvate or slightly contorted aestivation, sometimes with alternating appendages Corolla tubular or elsewhere sometimes saccate, violet to reddish, yellowish or white; tube elongate, narrow but often slightly dilated at the anther-level, not expanded at the throat, sparingly pubescent on the lower third inside; limb small, plicate, oblique, 5-lobed or -dentate, occasionally 2-lipped; lobes claviform to setaceous, sometimes emarginate, overlapping in bud, with valvate or slightly contorted aestivation, sometimes with alternating appendages.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 4(5), didynamous, or 2, equal, inserted one-third to above the middle of the corolla tube, included or rarely exserted; filaments filiform, sometimes flattened, often tape-like below, pubescent to the base or glabrous, partially adnate to the inner surface of the corolla tube; anthers all or only 2 fertile, ovate to linear in outline, coherent or connate, ventrifixed, the 2 unequal, ± parallel thecae dehiscing by longitudinal slits, and separated from each other for their lower quarter; staminodes 0–3, equal, tapering
Morphology Reproductive morphology Flowers Disc
Disk small, annular or cupular Disk small, annular or cupular.
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary subsessile, 2-locular; ovules several–many in each locule, on a fleshy axile placenta, anatropous.
Morphology Reproductive morphology Flowers Gynoecium Style
Style filiform or compressed slightly dilated at the apex.
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigma punctiform or slightly capitate, exserted or included
Morphology Reproductive morphology Fruits
Fruit capsular, ± globose or ovoid, apiculate, dry, smooth or rugulose, 2-valved, septicidally dehiscent Fruit capsular, ± globose or ovoid, apiculate, dry, smooth or rugulose, 2-valved, septicidally dehiscent.
Morphology Reproductive morphology Seeds
Seeds several to numerous, minute, ± prismatic, sometimes flattened on one side; testa somewhat leathery, minutely striate with tubercles in rows, or smooth, glabrous; embryo straight in the abundant endosperm, with the radicle often as wide as the cotyledons Seeds several to numerous, minute, ± prismatic, sometimes flattened on one side; testa somewhat leathery, minutely striate with tubercles in rows, or smooth, glabrous; embryo straight in the abundant endosperm, with the radicle often as wide as the cotyledons.
Morphology General Habit
Erect, ascending or sprawling usually herbaceous plants, glabrous or pubescent. Erect, ascending or sprawling usually herbaceous plants, glabrous or pubescent
Morphology Reproductive morphology Flowers Androecium
Stamens 4(5), didynamous, or 2, equal, inserted one-third to above the middle of the corolla tube, included or rarely exserted; filaments filiform, sometimes flattened, often tape-like below, pubescent to the base or glabrous, partially adnate to the inner surface of the corolla tube; anthers all or only 2 fertile, ovate to linear in outline, coherent or connate, ventrifixed, the 2 unequal, ± parallel thecae dehiscing by longitudinal slits, and separated from each other for their lower quarter; staminodes 0–3, equal, tapering.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary subsessile, 2-locular; ovules several–many in each locule, on a fleshy axile placenta, anatropous; style filiform or compressed slightly dilated at the apex; stigma punctiform or slightly capitate, exserted or included.
Distribution
A genus with 22 species from Central America and the Antilles southwards to NE Argentina, one species also widespread in Africa.

Native to:

Argentina Northeast, Argentina Northwest, Belize, Bolivia, Brazil North, Brazil Northeast, Brazil South, Brazil Southeast, Brazil West-Central, Colombia, Costa Rica, Cuba, El Salvador, French Guiana, Guyana, Honduras, Mexico Southeast, Mexico Southwest, Nicaragua, Panamá, Paraguay, Peru, Suriname, Uruguay, Venezuela, Venezuelan Antilles

Introduced into:

Angola, Benin, Burkina, Burundi, Cameroon, Central African Repu, Chad, Congo, Equatorial Guinea, Gabon, Gambia, Ghana, Guinea, Guinea-Bissau, Ivory Coast, Liberia, Mali, Mauritania, Niger, Nigeria, Rwanda, Senegal, Sierra Leone, Sudan, Tanzania, Uganda, Zambia, Zaïre

Schwenckia L. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Jan 1, 2003 Harley, R.M. [54586], Brazil K001073570
Feb 6, 2001 Silva, M.A. [2499], Brazil K001073566
Feb 5, 2001 Pirani, J.R. [CFSC 6905], Brazil K001073571
Jan 1, 1990 Irwin, H.S. [22543], Brazil K001073565
Jan 1, 1976 Harley, R.M. [17008], Brazil K001073569
Rodal, M.J.N. [287], Brazil K001073575
Claussen, P. [s.n.], Brazil K001073573
Harley, R.M. [24103], Brazil K001073577
Guedes, M.L. [PCD 5447], Brazil K001073574
Harley, R.M. [24104], Brazil K001073576
Bautista, H.P. [797], Brazil K001073568
Brooks, R.R. [592], Brazil K001073567
Andrade, W.M. [120], Brazil K001073572

First published in Gen. Pl. ed. 6: 577 (1764)

Accepted by

  • Govaerts, R., Nic Lughadha, E., Black, N., Turner, R. & Paton, A. (2021). The World Checklist of Vascular Plants, a continuously updated resource for exploring global plant diversity. https://doi.org/10.1038/s41597-021-00997-6 Scientific Data 8: 215.

Literature

Flora of West Tropical Africa

  • Heine in Kew Bull. 16: 465 (1963).
  • —F.T.A. 4, 2: 20, as Schwenkia Linn.

Flora Zambesiaca

  • Gen. Pl., ed. 6: 577 (1764) as “Schwenkia”
  • Heine in Kew Bull. 16: 465 (1963).
  • Hunziker, Gen. Solanacearum: 93 (2001).
  • Kew Bull. 16: 465 (1963).
  • Schwenckia L., Gen. Pl., ed. 6: 577 (1764) as “Schwenkia”
  • Vahl, Enum. Pl. 1: 21, 102 (1804).
  • emend. Vahl, Enum. Pl. 1: 21, 102 (1804).

Flora of Tropical East Africa

  • "Gen. Pl. ed. 6: (“567”) 577 (1764), as “Schwenkia"""
  • Gen. Solanaceae: 93 (2001)
  • K.B. 16: 465–469(1963);
  • Rodriguesia 44: 307–524 (1978);

Flora Zambesiaca
Flora Zambesiaca
http://creativecommons.org/licenses/by-nc-sa/3.0

Flora of Tropical East Africa
Flora of Tropical East Africa
http://creativecommons.org/licenses/by-nc-sa/3.0

Herbarium Catalogue Specimens
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Science Photographs
Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/