BUT ACE JE. 



415 



distinguished by its fruit, formed of carpels the pericarp of which 

 dilates in membranous samaras (fig. 471). It consists of trees from 



Ailanius glandulosa. 



Fig. 469. 



Floriferous branch (-^). 



\ i 



Fig. 471. 

 Long. sect, of carpel. 



Ailantus glandulosa. 



temperate Asia and Australia, with alternate imparipinnate (fig. 469) 

 fetid leaves, not bitter. The small and greenish flowers are disposed 

 in terminal ramified cymes. 1 



In other genera also, very ana- 

 logous to the preceding, the andro- 

 ceum is isostemonous. Such are : 

 Pier ana (fig. 472), bitter trees of 

 tropical America, with imparipin- 

 nate leaves, and 4— 5-merous poly- 

 gamous flowers, the petals but little 

 developed, subvalvate, the stamens 

 destitute of scale appendages, and 

 the fruit formed of one, two, or 

 three drupes, constructed like those of Quassia proper. Picrasma, con- 

 sisting of Asiatic trees, with imparipinnate leaves, very nearly allied 



Fig. 470. 

 Long. sect, of hermaphrodite flower (|). 



1 Rigiostacliys squamata (Pl., in Hook. 

 Loud. Joum., vi. 29 ;— B. H., Gen., 309, n. 7 ; 

 — Walp., Ann., i. 202), which is perhaps, 

 Recchia (Mog. & Sess., in DC. Syst,, i. 411) but 

 which does not exist in the herbarium of 

 M091NNO, at Madrid, has been placed beside 

 Ailanthiis and Samandura, after having been 



connected with ConnaraceeB and Surianeee. It 

 appears to us "probable that Rigiostachys is a 

 Rosacea, an abnormal Rosacea it is true, because 

 of the shallowness of its receptacular cup, and 

 the disposition of its inflorescence." Its flowers 

 have a small cupuliforin receptacle, but little 

 concave, liued by a disk, with twenty crena- 



