132. ICACINACEAE — I33. ACERACEAE — I34. SAPINDACEAE 335 



17. Petals bent backwards at the tip. Disc thick. Style short. Leaves 



opposite, lanceolate. Flowers in few-flowered axillary cymes. — 



Species i. West Africa (Congo). .... Acrocoelium Baill. 



Petals bent inwards at the tip. Disc absent. Leaves alternate. . . 18 



18. Sepals united at the base only. Filaments adnate to the corolla-tube 



throughout their whole length, without appendages. Style long, 

 filiform. Ovar}- and fruit without a swelling. — Species 5. Tropics. 



Leptaulus Benth. 



Sepals united high up. Filaments free from the corolla, with two tufts 



of hairs at the apex. Style short, conical. Ovary and fruit with a 



lateral swelhng. Flowers in head-like cymes. — Species i. West 



Africa Lasianthera Beanv, 



SUBORDER SAPINDINEAE 



FAMILY 133. ACERACEAE 



. Trees or shrubs. Leaves opposite, palmately lobed, without stipules. Flowers 

 in terminal corymbs, regular, pol3'gamous. Sepals 5, free. Petals 5, free. 

 Stamens 8, very rarely 4 or 12, perigynous, inserted on the inner edge of the 

 thick disc. Filaments free. Ovary superior, 2-lobed and 2-celled, with 2 

 ovules in each cell. Styles 2 or a single style with 2 branches or stigmas. 

 Fruit winged, splitting into 2 mericarps. Seeds exalbuminous. (Under 

 SAPINDACEAE.) 



Genus i, species 4. North-west Africa. They yield timber, tanning bark, 

 and sugar, and. serve as ornamental plants. " Maple." . . Acer L. 



FAMILY 134. SAPINDACEAE 



Trees or shrubs, rarelv {Cardiospennitm) herbs or undershrubs. Leaves 



alternate, usually compound. J^lowers in racemes or panicles, rarely solitary 



or in clusters, polygamous, rarely unisexual. Petals 4 — 5, mostly with a scale 



on the inner face, or absent. Stamens 4 — 24, usually 8, inserted within the 



disc, rarel}^ upon it ; sometimes disc indistinct. Anthers opening inwards by 



2 longitudinal slits. Ovary superior, 2 — 8-, usually 3-celled, sometimes not 



quite completely septate or with a single fertile cell, frequently lobed. Ovules 



I — 2, rarely {Cossignia) 3 in each ovary-cell, curved. Style i, undivided, 



rarely cleft. Seeds exalbuminous ; embrj-o usually curved. — Genera 51, 



species 200. (Lncluding DIDIEREACEAE.) (Plate 85.) 



.1. Ovary with i fertile cell and sometimes 2 sterile ones. Ovule i. Style 



3 — 4-cleft. Stamens 8 — 10. inserted on the edge of the ring-shaped 



disc. Petals .4. Sepals 2. Flowers dioecious. Leaves undivided. 



deciduous. Spiny trees. - Species 6. Madagascar. Some species 



yield timber. (Including Allnatidia Drake). [Tribe DIDIEREAE.] 



Didierea Baill. 



