280 NATURAL HISTORY OF PLANTS. 
Beside Samyda is placed Guidonia (figs. 307-309), distinguished 
by a receptacular cup generally more extended, and perigynous sta- 
mens, from five to fifteen or twenty in number, united among them- 
selves, and with an equal number of glandular or petaloid tongues, 
alternating with them, and often covered with hairs. The whole 
Guidonia ilicifolia. 
Togo 
CRE 
& 
0 
\ A g 
Sensor 
F1a. 307. Fie. 308. Fra. 309. 
Flower (+). Diagram. Longitudinal section of flower. 

of this combination frees itself from the single envelope of the flower 
at a greater or less height. The ovary contains three or four parietal 
pluriovulate placentas. The flowers in this genera are solitary, or 
more generally united in cymes, often umbelliferous. In Osmelia, 
consisting of Asiatic plants, the flowers are disposed in slender 
racemes, and have from eight to ten stamens, united with an equal 
number of villous tongues. 
In Zuceræa there are eight stamens and eight alternate tongues 
bearded at the summit; but the stigma is represented at the apex 
of the ovary by four or six sessile rays, and there are only one or 
two ascendent ovules in the ovary. The flowers are numerous on 
axillary ramified spikes. Zwnania, nearly allied to the preceding 
genera, is immediately distinguished from it, masmuch as the 
flowers, disposed in long spikes, have a membranous valvate calyx, 
which is irregularly torn at anthesis, stamens with extrorse anthers, 
and in their intervals glands with which they are united below into 
a single cup, glandular and thick, often glabrous, sometimes bifid. 
Tetrathylacium, which appears allied to the preceding genera, has 
four stamens alternate with the imbricated sepals, without inter- 
vening tongues, the flowers being collected in ramified spikes. 
Ryania (figs. 310-313) has great affinity with the preceding genera, 
although it has been generally placed in a totally different group— 
that of Passifloree. It has quite the vegetative organs of certain spe- 
cies of Guidonia, and a slightly concave receptacle upon the edges of 
