DB. M. T. MASTEKS Oy THE MOEPHOLOGY OF THE MALYALES. 21 



s s s s s 



p p p p 



sts sts fits sts sts 



X X X X X 



In Pavonia, on the other hand, accordiug to Payer, the sterile 

 teeth of the column are antipetalous. 



In Domheyece^ and in some other tribes, well-defined staminodes 

 occur, these staminodes being usually five in number and anti- 

 sepalous; even in il/^ZZ/fifn/^, where a staminode and a stamen appear 

 to be placed in front of each petal, it has been well remarked by 

 Bentham that they are not placed in the centre of the petal 

 (Journ. Linn. Soc. Bot. vol. vi. p. 119). This arrangement occura 

 in Riilingia and other genera, and may be represented thus : — 



s s s s s 



p p p p 



X st X st X st X st X St 



In Donibeya and Pterospermum itc. there are fifteen stamens 

 in five antipetalous groups, there being between each group of 

 three stamens one staminode, thus — ■ 



s s s 8 s 



p p p p p 



X 3 sts X 3 sts X 3 sts X 3 sts X 3 sts 



In KleinJiovia^ Buettneria^ Thtobroma^ and some other genera, 

 including Scaphopetalum^ a new genus from West Equatorial Africa, 

 a description of which is hereto appended, there are likewise three 

 antipetalous stamens, partially concealed within the concavity of 

 each of the petals, and alternating with staminodia of various 

 forms, but which are always five in number and almost invariably 

 antisepalous in position. In the tribe Buettnericce especially, and 

 in some other genera, the petals are not only concave but marked 

 with very prominent nerves, as are also to a less extent tlie sepals. 

 In the new genus to which I have referred, the cellular tissue 

 between the nerves is relatively so abundant that it is thrown into 

 folds forming longitudinal furrows between the ridge-like nerves. 

 The same pectdiarity exists to some extent in the sepals of these 

 plants. 



In Glossostemon the arrangement is yet more singular. In this 

 plant there are five sepals, five petals, five staminodes, and thirty 

 stamens, the position of which is variously described by difi'erent 

 authors. Endlicher (Gen. Plant, p. 1003. no. 5350) describes ten 

 of them as adnate to the base of the staminodes, " decern filament is 



