LEGUMINOS2#-CHiSALPINIE Zs. 93 
this. receptacle supports a calyx of four sepals imbricated in the bud 
(fig. 67). The posterior sepal really represents two of the true calyx- 
leaves, being inserted right under the vexillary petal, which is alto- 
gether covered by the two lateral petals in the bud. The two anterior 
petals often remain rudimentary. The androceum, also inserted in the 
mouth of the receptacular tube, consists of ten diadelphous stamens. 
Amherstia nobilis, 
Fig. 65. Fie. 66. 
Flower (3). Longitudinal section of flower, 
The nine anterior are united below into a broad trough-like sheath. 
The free parts of the filaments are very unequal in length; the five 
alternipetalous being very long, and the four others very short in 
proportion. Each bears an introrse two-celled anther of longitudinal 
dehiscence. This is also the case with the tenth stamen, superposed 
to the vexillary petal and standing free on the posterior side of 
the flower. The gynzceum consists of a shortly stipitate ovary, 
inserted very obliquely on the vexillary wall of the receptacle 
(fig. 66), and surmounted by a slender style, involute in the bud, 
ending in a little stigmatiferous head. On the posterior wall of the 
ovary is seen the placenta, which bears an indefinite number of 
obliquely descending ovules in two vertical rows, with their micro- 
