Family:
Araceae Juss.

Stylochaeton Lepr.

This genus is accepted, and its native range is Tropical & S. Africa.

[FTEA]

Araceae, S.J. Mayo. Flora of Tropical East Africa. 1985

Morphology General Habit
Seasonally dormant herbs
Morphology Stem
Stem an underground rhizome, sometimes stoloniferous; roots thick, spindle-shaped, tuberous
Morphology Leaves
Leaves solitary-several, radical, subtended by several basal cataphylls; petiole not pulvinate apically; basal sheaths often purplish spotted or banded; blade lanceolate, ovate, cordate-sagittate, sagittate or hastate-sagittate
Morphology Reproductive morphology Inflorescences
Inflorescences produced before or with leaves, borne at or below ground-level on short peduncles, usually subtended by several basal cataphylls Spathe tubular with connate margins in lower part, often inflated at extreme base, upper part a lanceolate-elliptic ± expanded limb, or unexpanded with a lateral slit, often somewhat or greatly thickened Spadix shorter than spathe, lower part bearing pistillate flowers, upper part longer, bearing staminate flowers, often separated from pistillate part by interstice bearing sterile flowers
Morphology Reproductive morphology Flowers
Flowers unisexual, surrounded by ± glandular cup-shaped perigon Staminate flowers: perigon often with very thick fleshy margins; stamens 2–7; filaments subulate, rarely thickened apically; anthers dehiscing by lateral slits; connective slender, sometimes ± thickened; central pistillode usually present Pistillate flowers closely appressed, borne in single basal whorl or in spirals; perigon usually greatly thickened and glandular or mealy on upper surface; ovary 1–2-locular; ovules 1–many per locule; placentation basal, parietal or axile; style thick, ± cylindric, exserted beyond perigon; stigma capitate to broadly discoid and massive
sex Male
Staminate flowers: perigon often with very thick fleshy margins; stamens 2–7; filaments subulate, rarely thickened apically; anthers dehiscing by lateral slits; connective slender, sometimes ± thickened; central pistillode usually present
sex Female
Pistillate flowers closely appressed, borne in single basal whorl or in spirals; perigon usually greatly thickened and glandular or mealy on upper surface; ovary 1–2-locular; ovules 1–many per locule; placentation basal, parietal or axile; style thick, ± cylindric, exserted beyond perigon; stigma capitate to broadly discoid and massive
Morphology Reproductive morphology Fruits
Berries borne at or below ground-level in globose to cylindric infructescence, often rugose, fleshy, 1–few-seeded
Morphology Reproductive morphology Seeds
Seeds with copious endosperm.

[CATE]

CATE Araceae, 17 Dec 2011. araceae.e-monocot.org

Distribution
Trop. & S. Africa.
Diagnostic
Seasonally dormant or evergreen, rhizomatous geophytes; cataphylls often conspicuously mottled; leaf blade linear to cordate, sagittate or hastate, fine venation reticulate; inflorescence appearing before or with the leaves, borne at or partially below ground level; flowers unisexual, perigoniate, perigone a single cup-like structure, more conspicuous in female flowers; male flower usually with central pistillode, filaments slender, free. Differs from Zamioculcas and Gonatopus in having entire (not compound) leaves, tepals connate into a cup and spathe tube margins connate.
Habitat
Tropical humid forests (evergreen species, e.g. S. zenkeri), tropical savannas and deciduous forests (seasonally dormant species, e.g. S. natalensis); geophytes.
General Description
Laticifers absent. HABIT : seasonally dormant or evergreen herbs, rhizome subterranean, horizontal to erect, sometimes stoloniferous, roots thick, spindle-shaped, often very fleshy, almost tuberous. LEAVES : 1 to several, cataphylls often conspicuously mottled and apically auriculate, sometimes persistent as fibrous mass. PETIOLE : sheath short to long, often purplish-spotted or banded. BLADE : lanceolate, ovate, ± rounded, cordate-sagittate, sagittate, hastate-sagittate or hastate; primary lateral veins pinnate or mostly arising basally, long-arcuate and running into marginal vein, lowermost primaries sometimes retrorse and then ascending, higher order venation reticulate. INFLORESCENCE : 1-4 in each floral sympodium, appearing before or with leaves, borne at or partially below ground level. PEDUNCLE : short, much shorter than petiole. SPATHE : erect, marcescent, tube : margins connate, often ventricose at extreme base, sometimes constricted between a lower and an upper inflated zone, rarely entire spathe narrowly cylindric, blade : lanceolate-elliptic, ± gaping or opening only by narrow longitudinal slit, often much thickened. SPADIX : free, shorter than spathe, female zone densely flowered, sometimes contiguous with male zone, often separated by axis bearing a few (to many) sterile or bisexual flowers, male zone fertile to apex. FLOWERS : unisexual, perigoniate, borne in single basal whorl or in spirals; perigone a single cup-like (urceolate) structure. MALE FLOWER : perigone often with very thick, fleshy margins, stamens 2-7, free, filaments filiform, long, rarely much thickened apically, connective slender, sometimes slightly thickened, thecae oblong, dehiscing by longitudinal slit, pistillode central, cylindric to conoid, sometimes absent. POLLEN : inaperturate, or sometimes vestigially monosulcate, ellipsoid, large (mean 53 µm., range 43-58 µm.), exine foveolate-reticulate or subreticulate. FEMALE FLOWER : perigone usually greatly thickened and sticky-glandular or farinaceous on upper surface, ovary 1-4-locular, ovules 1-many per locule, anatropous, placenta basal, parietal or axile, style thick, ± cylindric, exserted beyond perigone, stigma capitate to broadly discoid and massive. BERRY : borne at or below ground level in globose to cylindric infructescence, often rugose, fleshy, 1-few-seeded. SEED : ovoid to ellipsoid, slightly compressed, testa black, thin, costate, embryo axile, elongate, endosperm copious.

[FSOM]

M. Thulin et al. Flora of Somalia, Vol. 1-4 [updated 2008] https://plants.jstor.org/collection/FLOS

Morphology General Habit
Herbs with underground rhizome and fleshy roots
Morphology Leaves
Leaves basal, solitary to several; blade lanceolate, ovate, cordate-sagittate, sagittate or hastate-sagittate
Morphology Reproductive morphology Inflorescences
Inflorescences borne at or below ground-level on short peduncles, produced before or with the leaves Spadix monoecious with pistillate part near the base and long staminate part above, often with a zone of sterile flowers between
Morphology Reproductive morphology Inflorescences Bracts Spathe
Spathe forming a tube in lower part, upper part a lanceolate-elliptic ± expanded limb, or unexpanded with a lateral slit
Morphology Reproductive morphology Flowers
Female flowers with 1–2-celled ovary; stigma capitate to broadly disc-shaped Male flowers with 2–7 stamens; filaments subulate; anthers dehiscing by lateral slits Flowers unisexual, surrounded by ± glandular cup-shaped perianth
Morphology Reproductive morphology Fruits
Berries borne at or below ground-level in globose to cylindric infructescence, 1–few-seeded
Morphology Reproductive morphology Seeds
Seeds with endosperm.
Distribution
Some 20 species in tropical and southern subtropical Africa.
Note
The inflorescences are very inconspicuous, often developing partly below ground and appearing before the leaves. The present account is provisional and more detailed field work is needed.

Native to:

Angola, Benin, Burkina, Cameroon, Central African Repu, Chad, Congo, Equatorial Guinea, Ethiopia, Gabon, Guinea, Guinea-Bissau, Ivory Coast, Kenya, KwaZulu-Natal, Liberia, Malawi, Mali, Mauritania, Mozambique, Niger, Nigeria, Northern Provinces, Senegal, Sierra Leone, Somalia, Sudan, Swaziland, Tanzania, Togo, Zambia, Zaïre, Zimbabwe

Stylochaeton Lepr. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Bogner, J. [248], Tanzania 34231.000

First published in Ann. Sci. Nat., Bot., sér. 2, 2: 184 (1834)

Accepted by

  • Govaerts, R. & Frodin, D.G. (2002). World Checklist and Bibliography of Araceae (and Acoraceae): 1-560. The Board of Trustees of the Royal Botanic Gardens, Kew.

Literature

Flora of West Tropical Africa

  • F.T.A. 8: 187.
  • in Ann. Sci. Nat., Sér. 2, 2: 184 (1834)

CATE Araceae

  • Mayo, S.J., Bogner, J. & Boyce, P.C. 1997. The genera of Araceae. 370 pp.
  • Royal Botanic Gardens, Kew 2008. World Checklist of Selected Plant Families.

Flora of Somalia

  • Flora Somalia, Vol 4, (1995) Author: by M. Thulin [updated by M. Thulin 2008]

Flora of Tropical East Africa

  • Engl. in E.P. 73 (IV. 23F): 29 (1920), nom. et orth. cons. prop.
  • in Ann. Sci. Nat., sér. 2, 2: 184 (1834), as ‘Stylochaeton’

  • CATE Araceae

    Haigh, A., Clark, B., Reynolds, L., Mayo, S.J., Croat, T.B., Lay, L., Boyce, P.C., Mora, M., Bogner, J., Sellaro, M., Wong, S.Y., Kostelac, C., Grayum, M.H., Keating, R.C., Ruckert, G., Naylor, M.F. and Hay, A., CATE Araceae, 17 Dec 2011.
    http://creativecommons.org/licenses/by-nc-sa/3.0

  • Flora of Somalia

    Flora of Somalia
    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

  • Kew Backbone Distributions

    The International Plant Names Index and World Checklist of Selected Plant Families 2022. 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 2022. 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