RUTACEÆ. 
415 
distinguished by its fruit, formed of carpels the pericarp of which 
dilates in membranous samaras (fig. 471). 
It consists of trees from 
Ailantus glandulosa. 

Fie. 469. 
Floriferous branch (5). 
Fie. 471. 
Long. sect. of carpel. 
temperate Asia and Australia, with alternate imparipinnate (fig. 469) 
fetid leaves, not bitter. The small and greenish flowers are disposed 
in terminal ramified cymes." 
In other genera also, very ana- 
logous to the preceding, the andro- 
ceum is isostemonous. Such are: 
Picrena (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 
Ailantus glandulosa, 

Fie. 470. 
Long, sect, of hermaphrodite flower (+). 
three drupes, constructed like those of Quassia proper. Picrasma, con- 
sisting of Asiatic trees, with imparipinnate leaves, very nearly allied 

1 Rigiostachys squamata (Pu., in Hook, 
Lond. Journ., vi. 29 ;—B. H., Gen., 309, n. 7; 
—Watp., Ann., i. 202), which is perhaps, 
Recchia (Mog. & Sess., in DC. Syst., i, 411) but 
which does not exist in the herbarium of 
Moginno, at Madrid, has been placed beside 
Ailanthus and Samandura, after having been 
connected with Connaraceæ and Surianeæ. It 
appears to us “probable that Rigiostachys is a 
Rosaceæ, an abnormal Rosacee it is true, because 
of the shallowness of its receptacular cup, and 
the disposition of its inflorescence.” Its flowers 
have a small cupuliform receptacle, but little 
concave, lined by a disk, ‘with twenty crena- 
