IQ. ARACEAE II7 



18. Juice milky. Leaves cordate or sagittate. Female inflorescence not 



adnate to the spathe. Ovary i -celled. [Tribe NEPHTHYTIDEAE.] 19 



Juice not milky. Leaves lanceolate oblong or elliptical, acute or obtuse 



at the base, rarely cordate and then female inflorescence adnate to the 



spathe or ovary 2-celled. Seed albuminous 22 



19. Stem underground, creeping. — Species 3. West Africa. Used as orna- 



mental plants. (Including Oligogynium Engl.) . Nephthytis Schott 

 Stem above ground, chmbing, woody. 20 



20. Leaves perforated or dissected. Male inflorescence three times as long as 



the female and contiguous to it. Ovary with a strongly projecting 

 parietal placenta. — Species 2. West Africa. 



Rhektophyllum N. E. Brown 



Leaves entire or lobed, not perforated. Ovary with a slightly projecting 



parietal or sub-basal placenta 21 



21. Leaves oblong, shortly cordate at the base. Male inflorescence twice as 



long as the female and contiguous to it. Stamens 2 — 3. — Species i. 

 West Africa (Cameroons). (Under Cercestis Schott). 



Alocasiophyllum Engl. 



Leaves sagittate or hastate. Stamens usually 4. — Species 7. West 



Africa. Cercestis Schott 



22. Stem creeping. Female inflorescence adnate to the spathe, as long as the 



male. Ovary conical. Style present. — • Species i. Central Africa. 

 Used as an ornamental plant. [Tribe CALLOPSIDEAE.] Callopsis Engl. 

 Stem climbing or erect. Female inflorescence free from the spathe. 

 Ovary subglobose. Style wanting. — Species 17. Central Africa. Some 

 are used as ornamental plants. [Tribe CULCASIEAE.] Culcasia Beauv. 



23. (17.) Spadix covered with fertile flowers to the top. Ovary with 4 or 



more ovules. Leaves sagittate or hastate. Spathe funnel-shaped. — ■ 

 Species 10. South Africa and southern Central Africa ; one species 

 (Z. aethiopica Spreng.) cultivated as an ornamental plant under the name 

 of " Calla " and naturalised in the island of Madeira. [Aroides Heist., 

 Richardia Kunth). [Tribe ZANTEDESCHIEAE.] Zantedeschia Spreng. 

 Spadix ending in an appendage which is glabrous or covered with rudi- 

 mentary flowers, rarely without an appendage, but then ovary i — 2- 

 ovuled and leaves dissected 24 



24. Ovules inverted. Ovary usually 2 — 4-celled. Male and female portions 



of the spadix contiguous, rarely separated by a glabrous interval without 



barren flowers. Leaf i, dissected. [Tribe AMORPHOPHALLEAE.] 25 



Ovules straight. Ovary i-celled. Seeds albuminous. Spadix with a 



terminal appendage. [Tribe AREAE.] 27 



25. Spadix ending in a flowerless appendage. — Species 35. Tropics. Some 



have edible tubers or are used as ornamental plants. (Lender Amor- 



phophallus Blume). (Plate 12.) Hydrosme Schott 



Spadix covered with flowers to the top ; upper flowers sometimes reduced 

 to barren stamens 26 



