1. Family: Araceae Juss.
    1. Genus: Amorphophallus Blume ex Decne.
      1. Amorphophallus calabaricus N.E.Br.

        This species is accepted, and its native range is Benin to Kenya.

    [CATE]

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

    General Description
    Tuber pressed globose to ovoid (‘oval’), 2.4-8 x 1.5-4 cm, light brown. LEAF 80-150 cm big, appearing after the inflorescence; petiole 0.6-1.2 m long, pale green, with dark green to black green spots, may be furrowed at the base or else smooth. Blade 80-100 cm in diameter, rachis only of highest order leaflets narrowly cuneiformly winged (‘schmal keilförmig geflügelt’), becoming lighter towards the petiole. Terminal leaflets broadly elliptic (‘oval’) to elongate-broadly elliptic-elliptic (‘länglich-oval-elliptisch’), slightly asymmetric (subsp. mayoi), 6-20 x 2-6 cm, attenuating into a short tip (1-2 cm long and 1-2 mm wide). Cataphylls 3, egg-shaped to lanceolate, the inner one up to 20 cm long, with slightly raised veins on the under side, under side pale green, upper side green. INFLORESCENCE long stipitate, 50-100 cm high. Peduncle 20-63 cm long, 0.8-1.5 cm in diameter, green and spotted dark-green. Spathe erect, 10-25 cm long, arranged into a conic to acute vase-shaped tube and a triangular open limb, without a distinct constriction; the spathe strongly overlaps itself and the overlapping part (spathe seam, (‘Spathanaht’)) is bow-shaped. Tube conical, 5-9 x 3-4 cm; outside green with dark-green spots, becoming green purple towards the open limb; inside purple, basal inside with longish hairlike emergences, these 1-4 mm long, becoming papilose towards the top, emergences scattered, white purple. Open limb triangularly attenuating, erect, 5-16 cm long, purple brownish, darker towards the margin, margin smooth to slightly undulate or lobed (subsp. mayoi), inside and outside brownish purple. Spadix sessile, rarely stipitate for 2 mm (subsp. calabaricus), 15-50 cm long, at least 1 ½ times as long as the spathe. Pistillate zone cylindrical, 1.5-2.5 x 0.5-1.3 cm, flowers only partially congested or entirely congested. Staminate zone cylindrical-obconical, 1.8-2.8 x 0.5-1.5 cm, flowers congested; sterile zone between pistillate and staminate zone absent or 1(-5) mm wide. Appendix long conical to club shaped, 10-45 cm long, 1-2 cm in diameter (basally) to 3 mm in diameter (at the tip), purple, ± smooth, not or slightly constricted above the staminate zone; ratio of pistilate to staminate zone 0.65-0.75 (0.7-1.1 subsp. mayoi) : 1. Pistillate flowers 2-4 mm long; ovary 1-2 x 1-2.5 mm, bilocular, ovoid-globose, green, placentation basal, one ovule-attachment per locule; stigma sessile, dark purple, 2-humped or rarely unlobed, 1-1.5 x 1-2 mm, smaller or rarely as wide as the ovary, circular from above, circular to slightly arched from the side, stigma humps slightly conical. Staminate flowers 1-1.5 x 1-1.5 cm; anthers free, globose-ovoid to cubic, dark orange; filaments not visible or 0.3-0.4 mm long; pores apical, broadly elliptic (‘oval’), one pore visible per theca; connective thinn, channelled. Pollen orange, 49.4-59.4 x 42-54.4 µm, slightly ovoid, inaperturate; exine smooth. INFRUCTESCENCE conical or cylindrical, 7-16 x 2-6 cm, peduncle elongates during fruit development to 0.5-1.2 m, 0.5-1.5 cm in diameter. Berries 0.6-1 x 0.7-0.8 cm, two seeded, globose to ovoid, pale green when immature, orange when mature; seeds ± globose to flattened ovoid, 4-7 x 3-6 mm. Smell unknown.
    Diagnostic
    Basal inner side of the spathe with hair-like emergences; Stigma globose to conical from the side.
    [FTEA]

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

    Habit
    Tuber depressed-globose, ± 4 cm. in diameter.
    Leaves
    Petiole up to 1.2 m. long, mottled; ultimate leaf-lobes elliptic to obovate, acuminate, 8–10 cm. long, 3–3.5 cm. broad.
    Inflorescences
    Inflorescence appearing before the leaves, subtended by oblong-lanceolate cataphyll up to 20 cm. long; peduncle up to 63 cm. long or more, up to 1 m. long in fruit, 0.5–1.5 cm. in diameter.
    Spathe
    Spathe 13–20 cm. long; tube poorly differentiated from limb, obconic, not clearly constricted at apex, 6–9 cm. long, about 5–7 cm. in diameter, outer surface probably greenish, inner surface densely covered towards base with filamentous projections, mostly 1–3 mm. long; limb broadly ovate-triangular, acute to obtuse, margins somewhat undulate, 7–11 cm. long, 9–13 cm. broad, probably maroon on inner surface.
    Spadix
    Spadix 19–29 cm. long, longer than spathe; sterile appendix elongate-conic, slightly narrowed towards base, 10–24 cm. long, up to 1.7 cm. in diameter near base, tapering to 3 mm. in diameter near apex, probably purplish, ± smooth; staminate part 2–2.5 cm. long, 0.7–1.6 cm. in diameter, narrowing somewhat at base; pistillate part subcylindric, tapering slightly towards apex, 1.8–2.4 cm. long, 0.8–1.1 cm. in diameter, contiguous with staminate part, pistils usually congested, sometimes ± distant.
    Stamens
    Stamens free, sessile, 1–1.5 mm. broad.
    Pistil
    Pistil 2.5–3 mm. long; ovary 2–2.5 mm. in diameter, 2-locular, ovules solitary in each locule, placentation at base of septum, stigma sessile, subglobose, shallowly 2-lobed, ± 1.5 mm. in diameter.
    Fruits
    Berry 0.6–0.7 cm. in diameter, 2-seeded.
    Seeds
    Seeds subglobose, ± 4 mm. in diameter.
    Habitat
    Evergreen forest, scrub on granite hill; 1150–1650 m.
    Distribution
    K5 U2 U3 U4
    [FWTA]

    Araceae, F. N. Hepper. Flora of West Tropical Africa 3:1. 1968

    Spathe
    Spathe chocolate brown or pale yellow green, darkly spotted outside
    Spadix
    Spadix appendage hollow.
    Peduncles
    Peduncle 2-3 ft. high, mottled

    Images

    Distribution

    Native to:

    Benin, Cameroon, Kenya, Nigeria, Uganda, Zaïre

    Amorphophallus calabaricus N.E.Br. appears in other Kew resources:

    Date Reference Identified As Barcode Type Status
    Keay, R.W.J. [22803], Nigeria 16860.000
    Cheek, M. [7463], Cameroon 29047.890
    Man, G. [2336], Nigeria K000345951 Unknown type material

    First published in D.Oliver & auct. suc. (eds.), Fl. Trop. Afr. 8: 155 (1901)

    Accepted by

    • Akoègninou, A., van der Burg, W.J. & van der Maesen, L.J.G. (eds.) (2006). Flore Analytique du Bénin: 1-1034. Backhuys Publishers.
    • Ittenbach, S. (2003). Revision der afrikanischen Arten de Gattung Amorphophallus (Araceae) Englera 25: 1-263.
    • 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.
    • Govaerts, R. (1995). World Checklist of Seed Plants 1(1, 2): 1-483, 1-529. MIM, Deurne.

    Literature

    Flora of West Tropical Africa
    • Engl. Pflanzenr. 4, 23C: 100. (1911)
    • in F.T.A. 8: 155 (1901)
    CATE Araceae
    • Ittenbach, S. 2003. Revision der afrikanischen Arten der Gattung Amorphophallus (Araceae). Englera. 25: 5-263
    Kew Backbone Distributions
    • Akoègninou, A., van der Burg, W.J. & van der Maesen, L.J.G. (eds.) (2006). Flore Analytique du Bénin: 1-1034. Backhuys Publishers.
    • Ittenbach, S. (2003). Revision der afrikanischen Arten de Gattung Amorphophallus (Araceae) Englera 25: 1-263.
    Flora of Tropical East Africa
    • Hepper in Flora of West Tropical Africa, ed. 2, 3: 118 (1968).
    • Engl. in A. Engler, Das Pflanzenreich 48 (IV. 23C): 100 (1911).
    • N.E. Br. in Flora of Tropical Africa 8: 155 (1901).

    Sources

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

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

    Herbarium Catalogue Specimens
    'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    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 2019. 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 2019. 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