22-t NA T UU . I L TITS TOR Y OF PL A XTS. 



ro^-anls the cfyntcceum, androceum, and receptacle, formed exactly as 

 in Anond, and the llesliy fruit is usually the same. They are, how- 

 ever, distini^-uishcd at a glance by a character, no doubt of little im- 

 portance in itself, but very easy to recognise; the gamopetalous co- 

 rolla has three laterally flattened horn-shaped projections. These solid 

 spurs belong to the outer petals, which, united from the base into a 

 short cylindrical or bulging tube, have the organic apex curtailed and 

 incurved, so that altogether they form a vault closely applied to the 

 reproductive organs. But lower down, the median dorsal part of 

 each is swollen into the sort of wing of which we have spoken, and 

 whicli, more or less obtuse at the apex, rises obliquely or vertically 

 like the leg of a tripod.' The inner petals want this appendage ; 

 they are like the bodies of the outer petals, or much smaller, reduced 

 to small scales, or even quite absent. The receptacle is like a 

 depressed cone ; the stamens are surmounted by a truncate dilatation 

 of the apex of the connective ; each ovary contains an ascending 

 nearly basilar ovule ; and the fruit is either nearly smooth or covered 

 with recurved points, as in A. miiricafa or several species oi Aheremoai' 

 The genus BoUlnia consists of about twenty trees or shrubs found 

 in America, from Mexico to the south of Brazil.^ Their habit and 

 ibliage are those oi Anona, and their flowers are terminal, leaf-opposed, 

 or extra-axillary, solitary or grouped in few- flowered cymes. 



The general arrangement of the flowers of BoIIinia is also found in a 

 Sumatran plant wliich has been named Paraiiabotri/s ;^ except that the 

 ovaries of the latter contain numerous ovules instead of a single one, 

 and the ascending horns on the backs of the petals are nearly cylin- 

 drical, and of the same thickness in every direction. In the latter 

 character, P^frr/r/fti^o/ry^ justifies the name given to exjDress its analogy 



' Following the development of tliese organs in sists of free carpels ; but does not point out in 



the bud, we have seen {Adansonia, viii. 310) which species is observed this peculiarity, which 



that in the young buds the outer corolla is at we have not been in a position to verify, 

 first globular, and with the convex surface per- ^ A. S. H., loc. cit. — A. DC, Mem., 23. — 



fectlysinootb. Later, a slight gibbosity arises Maet., Fl. Bras., Anonac, 17, 47, t. 6. — 



on the middle of the dorsal median Hue of each Schltl., Linnma, ix. 314. — Walp., Rep., i. HO; 



petal. This it is, which becoming more marked ii. 748; ^1h»., ii. 20; iii. 813; iv. 57; vii. 58. — 



day by day, finally produces the solid curved Tl. & Te., Ann. Sc. Nat., ser. 4, xvii. 30. — 



horn, obtuse at the apex, which all authors have Geiseb., Fl. Brit. W. Ind., 5. — H. Bn., Adan- 



renuirked. It is easy to show that the true sonia, viii. 268. 



organic apex of the petal is seated far lower '' MiQ., Fl. Iiid.-Ba/., suppl. i. 151; Attn. 



down than that of this solid spur. 3Ius. Lugd. Bal., ii. 43. — H. Bn., Adansonia, 



» I'.KNTIIAM says (Journ. Linn. Soc, v. 67) viii. 310, 329, 341. — Xi/lopiaB.ll.,G en. ,28,958, 



that the fruit of certain species of Rollinia con- n. 32 (nee Atictt.). 



