The Zamioculcas and Gonatopus
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G. Bentham, J. D. Hooker (1883) in: Genera Plantarum. Vol. III. pp. 957; 962.

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FORMÆ ABNORMES.

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Inter genera perianthio donata, in Zamioculcade solo flores superiores etsi revera masculi ovariis bene evolutis instructi sunt.

CONSPECTUS GENERUM.

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Series C. Flores omnes hermaphroditi (Zamioculcade excepto). Perianthium e segmentis 4-8 distinctis.

Tribus X. Zamioculcasieæ. Flores in spadice inappendiculato abortu unisexuales, superiores ♂ ovariis effœtis, inferiores ♀ antheris effœtis. Perianthii segmenta 4. Herbæ acaules, foliis 1–3-pinnatisectis.

82. ZAMIOCULCAS. Ovarium 2-loculare ; ovula in loculis solitaria, antropa.—Afr. trop. or.

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G. Bentham, J. D. Hooker (1883) in: Genera Plantarum. Vol. III. pp. 993-994.

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TRIBUS X.   ZAMIOCULCASIEÆ.

82. Zamioculcas, Schott, Synops. Aroid. 71. — Flores in spadice inappendiculato abortu monoici, superiores ♂ ovariis effœtis, inferiores ♀ staminibus effœtis v. 0, interspatio 0. Perianthii segmenta 4, cuneato-spathulata, apicibus truncatis incrassatis. Fl. ♂: Stamina 4, filamentis brevibus subclavatis inclusis, apicibus angustatis ; antheræ minutæ, terminales, loculis connectivum superantibus rimulis apicalibus dehiscentibus ; pollen vermiforme. Ovarium effœtum. Fl. ♀ : Stamina 4, imperfecta. Ovarium oblongum v. ovoideum, 2-loculare, in stylum brevem attenuatum, stigmate pulvinari ; ovula in loculis solitaria, subamphitropa, funiculis brevibus placentis septo adnatis affixa, micropyle infera. Fructus … — Herbæ rhizomate brevi v. horizontali, inferne tubera sessilia emittente, superne folia 1-2-pedalia cum inflorescentia parva proferentes. Folia plura, crasse petiolata, imparipinnata, pinnis alternis 6-8-jugis, v. bipinnata pinnis pinnulisque oppositis cum rhachi articulatis deciduis reticulatis, petiolo supra medium nodoso-incrassato basi tumido brevissime vaginante. Pedunculus elongatus v. foliis multoties brevior et petiolo tenuior. Spathæ tubus subglobosus, convolutus, fl. ♀ involvens, fauce constricta, lamina lanceolata v. cymbiformi dorso supra apicem cornuta horizontali recurva v. reflexa. Spadix sessilis, cylindraceus, spatha brevior, brevis v. elongatus, supra fl. ♀ constrictus ; inflorescentiæ densifloræ ; ♂ brevis et ellipsoidea v. elongata et cylindracea, floribus hexagonis ; ♀ brevis, floribus 4-gonis.

Species 2, Africæ tropicæ orientalis incolæ. Genus in sectiones 2 divisum:—
1. Euzamioculcas. Folia imparipinnata. Pedunculus brevis. Spatha cymbiformis. Inflorescentia ♂ brevis et cum ♀ conformis. Fl. ♀ staminodiis instructus. Engl. Arac. 208. Lodd. Bot. Cab.t. 1408 (Caladium). Bot. Mag. t. 5985.
2. Gonatopus. Folia bi-tri-pinnata. Pedunculus gracilis. Spatha lanceolata. Inflorescentia ♂ cylindracea, quam ♀ multo longior. Fl. ♀ staminodiis 0. Bot. Mag. t. 6026. GONATOPUS, Engl. Arac. 208.