166 NATURAL HISTORY OF PLANTS. 



10. Acrocarpus Wight. — Flowers subregular ; receptacle cam- 

 panulate, lined by a disk ; calyx and corolla subregular. Sta- 

 mens 5, alternipetalous equal exserted. Germen central stipitate 



co-ovulate ; style short inllexed ; stigma small terminal. Legume 

 elongated oc -seeded, on very long stalk. Seeds . . . ? — An un- 

 armed tree ; leaves large 2-pinnate ; leaflets ovate acuminate her- 

 baceous ; flowers expanding before leaves, rather large, racemose ; 

 racemes solitary axillary, or in twos or threes at extremities of 

 branches; bracts and bractlets small caducous (East Indies). 

 See p. 81. 



11. Wagatea Dalz. — Flowers subregular (of Casalpinia) ; recep- 

 tacle long, campanulate or subtubular, lined by a disk ; calyx and 

 corolla subregular inbricated. Stamens 10, free, markedly peri- 

 gynous. Germen inserted in bottom of receptacle, free oo-ovulate ; 

 style subclavate at apex ; stigma concave oblique sub-2-labiate. 

 " Legume oblong-linear acute coriaceous, transversely depressed 

 between seeds ; sutures thickened. Seeds obovate-oblong ; testa thick 

 bony ; radicle very short, straight." — High climbing prickly 

 shrubs ; leaves 2-pinnate ; leaflets numerous ; flowers in long 

 simple or branched spikes ; rachis thick, pitted at insertion of each 

 flower ; bracts small caducous (East Indies). See p. 81. 



12. Pterolobium P. Br. — Flowers subregular ; receptacle slightly 

 concave, lined by a disk. Sepals 5, imbricated. Petals 5, imbri- 

 cated. Stamens 10, free; anthers introrse 2-rimose. Germen 

 central sessile, 1-2-ovulate ; style short or long ; apex truncate or 

 concave, stigmatiferous. Legume sessile compressed samaroid 

 indehiscent 1-seeded ; placentary margin oblique, produced into a 

 membranous, oblong or falcate wing. Seed descending compressed ; 

 embryo exalbuminous ; cotyledons flattened ; radicle short straight. — 

 Trees or high climbing shrubs, prickly; leaves 2-pinnate; stipules 

 small or ; flowers in loosely-branched terminal racemes ; bracts 

 very caducous; bractlets (Tropical Asia, Africa, and Australia). 

 See p. 82. 



1 3. Barklya F. Muell.— Flowers subregular (of Vterolobinm) ; 

 receptacle cupuliform, lined by a disk. Calyx gamosepalous, shortly 

 toothed, imbricated. Petals subequal with rather long claws; 



