53- MORACEAE 165 



5. Inflorescences unisexual, the lateral containing many male flowers, the 



middle one a single female flower. Receptacle covered on the outside 

 by imbricate bracts. Male flowers with a 3 — ■4-partite perianth and 

 3- — 4 stamens. Female flowers without a perianth. Trees or shrubs. 

 Leaves undivided. — Species 2. Central Africa. Mesogyne Engl. 

 Inflorescences bisexual, containing many male flowers and one or several 

 female ones, usually provided with bracts on the margin only. Perianth 

 2-lobed or wanting. Stamens 2, rarely i or 3 6 



6. Receptacles top-shaped, subsequently cupular, bearing many male flowers 



and a single central female flower. Pericarp membranous. Shrubs. 

 Leaves undivided. — Species 5. Central Africa. 



Trymatococcus Poepp. c\: Endl. 



Receptacles expanded, often divided into linear segments, bearing many 



male flowers and several female ones. Pericarp crusty within, fleshy 



outside. Herbs or low shrubs. — Species 50. Tropics. Some are 



poisonous or used medicinally. (Plate 31.) . . . . Dorstenia L. 



7. Female flowers solitary, axillary ; male flowers in spike-like inflorescences. 



Perianth 4-toothed. Trees. Leaves undivided. — Species i. Island 

 of Reunion. Used medicinally. [Tribe STREBLEAE.l 



Maillardia Frapp. & Duchartre 

 Female flowers in spike- or head-like inflorescences 8 



8. Female flowers in head-like, but sometimes elongated (oblong) inflores- 



cences, the male in spike- raceme- or head-like ones. Style simple, 

 with a thread-shaped stigma, rarely with an abortive side-branch. 



Trees. [Tribe BROUSSONETIEAE.] 9 



Female and male flowers in spike-like inflorescences. Perianth of the 

 female flowers divided to the base. Style 2-parted, with thread-shaped, 

 equal or subequal stigmas. [Tribe MOREx'\E.] 12 



9. Male flowers in head-like inflorescences. Perianth of the female flowers 



4-lobed. Spinous plants. • — Species i. East Africa and Madagascar. 

 It yields a dye-wood and edible fruits. (Under IHecospernvim Treculj 



Cardiogyne Bur. 

 Male flowers in spike- or raceme-like inflorescences 10 



10. Male flowers in lax, raceme-like inflorescences. Spinous plants. Leaves 



entire. Perianth of the female flowers deeply 4-cleft, persistent and 

 enclosing the fruit. — Species i. Cultivated in North Africa. The 

 wood is used for joiners' work, the leaves as food for silkworms. 



Madura Xutt. 

 Male flowers in dense, spike-like inflorescences. Spineless plants. . . 11 



11. Perianth of the' female flowers deeply 4-cleft or 4-parted. Fruit wholly, 



or for the greatest part, enclosed by the perianth. Leaves undivided. — 

 Species 2. Central Africa. They yield timber. Chlorophora Gaud. 

 Perianth of the female flowers shortly toothed. Fruit overtopping the 

 perianth. Leaves usually lobed. — Species i {B. papyrifera Vent., 

 paper-mulberry). Cultivated in North Africa. Used for making paper ; 

 the fruit is edible Broussonetia Vent. 



