406 NATURAL HISTORY OF PLANTS. 



convex or conferruminate ; radicle incurved or nearly straight in- 

 ferior. — Trees or shrubs sometimes scandent, cirrhoiis or ecirrhous ; 

 leaves alternate, pinnate or 3-foliolate ( Thinouia), sometimes 1 -foliolate ; 

 flowers in small cymes ; cymes in compound or sometimes ( Thmoua) 

 short subcapitate racemes. {Trap. America?) 



29. Atalaya Bl.~ — Flowers regular polygamo- dioecious ; sepals 

 5, unequal, imbricated. Petals alternate 5, at base within penicillate 

 or furnished with scales. Stamens 8, 9, central, interior to com- 

 plete annular disk ; filaments free, equal or unequal erect ; anthers 

 oblong introrse, 2-rimose. Germen (in male flower rudimentary) 

 central ; style short, stigmatiferous 3 -agonal at apex ; ovule solitary 

 in cells ascendent at middle of inner angle ; micropyle extrorsely 

 inferior. Fruit 3 samarae, dry long winged at back, solute from 

 axis indehiscent. Seed ascendent ; testa coriaceous ; cotyledons of 

 exalbuminous embryo unequal thick plano-convex ; radicle short 

 inferior. — Glabrous trees or shrubs ; leaves alternate pinnate ; 

 folioles CO, or sometimes more rarely 1-3 ; petiole and rachis some- 

 times dilated-foliaceous ; flowers ^ in ramified compound-cymiferous 

 axillary and terminal racemes.* {Trop. and subtrop. Oceania.^) 



30 ? Ptseroxylon Eckl. and Zeth.*^ — Flowers polygamo-dice- 

 cious (nearly of 3Ielicocca or Atalaya) regular ; sepals 4, small and 

 petals same in number, alternate longer, imbricated. Stamens 4 

 (effete in female flower) alternipetalous ; filaments interior to 4- 

 crenate disk ; anthers introrse, 2-riuiosc. Germen (rudimentary in 

 male flower) 2-locular ; style branches 2-capitellate stigmatiferous at 

 apex ; ovules ascendent ; micropyle extrorsely inferior. Capsule 

 coriaceous samaroid compressed, obcordate, produced at apex to 

 2 thick rigid obtuse wings, loculicidally 2-valved, finally 4-partite. 

 Seeds suberect, produced above to long vertical Aviug; albumen 

 thin fleshy ; cotyledons of curved embryo large compressed ; radicle 



' Spec. 10-12. H. B. Fl. Mquin. t. 56.— pighia. 



H. B. K. Nov. Gen. ct Spec. v. 123.— A. S. H. ' Spec, about 6. DC. Prodr. i. 608, n. 13 



Fl. Bras. Mo: ii. 384.— Griseb. Fl. Brit. W.- {Sapuidiis). — Dcne. Herb. Timor. \lo{Cupania). 



Iiid. 126; Cat. PI. Cub. 46.— Walp. Rep. i. 420 —A. Rich. Toy. Astrol. Bot. 31, t. 12 [Thou- 



(part.) ; t. 36.5; A n. vii. 628. ;'»/«).- Bexth. Fl. Amtral. i. 462 (part.).— F. 



2 iJ»«(/)//;«, iii. 186.— B. H. 0<.-«. 401 n. 30. Mi'ELL. Fragm. i. 46, 98 {rhouinw).—W AhF. 



' Small or rather large, white. Ann. vii. 628. 



* Flower nearly of Triceros ; samaras nearly ' Eckl. et Zeyh. Enum. 54. — Endl. Gen. n. 



of Tliouiiii/i, Pssudatalai/a, Acer, or some Mai- 5636. — B. H. Oen. 411, n. 60. 



