Il8 19. ARACEAE 



26. Ovary i-celled. Male inflorescence as long as the female. Spathe boat- 



shaped. — Species 7. Central Africa. Some have edible tubers. 



Anchomanes Schott 

 Ovary 2-celled. Male inflorescence longer than the female. — Species 2. 

 Equatorial West Africa. (Including Zygant hey a N.E. Brown). 



Pseudohydrosme Engl. 



27. Spadix unflsexual (containing male or female flowers only). Stamens 2 — 4. 



Ovules basal. Leaves dissected. — Species 4. East Africa. Some are 



poisonous. . Arisaema Mart. 



Spadix bisexual (containing both male and female flowers). . . ' . 28 



28. Male inflorescence contiguous to the female 29 



Male inflorescence separated from the female by a distinct interval usually 



covered -wnth rudimentary flowers 30 



29. Stamen i. Anther opening by a slit. Ovules basal. Leaves sagittate 



or hastate. — Species 2. North Africa. Used as ornamental plants. 

 The tubers are poisonous when raw, but edible when cooked, and furnish 

 starch, medicaments, and a substitute for soap. Arisarum Targ. Tozz. 

 Stamens 3—4. Anthers opening by pores. Ovules basal or apical. Leaves 

 severial, dissected.- — Species 2. North-west Africa. Used as ornamental 

 plants. The tubers are poisonous when raw, but edible when cooked, 

 anä furnish starch, medicaments, and a substitute for, soap. 



^ '.,,.,, Dracunculus Schott 



30. Interval between the male and the female inflorescence without rudimentary 



flowers. Spathe divided into two chambers, one of which contains a 

 female flower, the other one several male flowers. Stamens 2. Ovules 

 numerous. Leaves ovate. — Species i. North-west Africa (Algeria). 



Ambrosinia Bassi 



Interval between the male and the female inflorescence clothed with 



rudimentary flowers. Spathe not 2-chambered. Female flowers 



several 31 



31. Ovules 6 or more, parietal. Stamens 3 — 4. Leaves sagittate or hastate. — 



Species 2. North Africa. Poisonous and sometimes used as ornamental 

 plants. The tubers are edible when cooked and yield starch ; they are 



also used in medicine and as a substitute for soap Arum L. 



Ovules 1—4, basal. Stamens i — 2. Leaves linear, oblong, ovate, or dis- 

 sected. 32 



32. Ovule I. Leaves several, entire. — Species 3. North Africa. Used as 



ornamental plants. The tubers are edible when cooked, and yield 

 starch, medicaments, and a substitute for so^p. . . . Biarum Schott 

 Ovules 2 — 4. Leaf i, dissected. — Species 2. East Africa and Angola. 

 Used as ornamental plants. The tubers are edible when cooked, and 

 yield starch, medicaments, and a substitute for soap. 



Sauromatum Schott 



