PHYSIOLOGY, 5 309 
may be refuted, even without the aid of anatomical 
dissection. ‘ 
The flower does not always appear in the angles 
of the leaves or at the extremities of the stems, but 
in some plants it pushes forth in very uncommon 
places. 
Rohria petioliflora has its flowers fixed to the pe- 
tiole. ‘The same we see in Salsola altissima, and 
some other plants. In most species of the genus 
Ruscus, the flower is attached to the middle of the 
leaves. It is seen on. the margins of the leaves, in 
most species of Phyllanthus, Xylophylla, Polycardia, 
and one species of Ruscus, R. androgynus. On 
branches which are leafless appear the flowers of 
Cynometra ramiflora; Ceratonia Siligua; Averrhoa 
Bilimbi, and Carambola ;. Boehmeria ramiflora, and 
other plants. Most remarkable is the manner in 
which_ the flower is placed in a tree of the East In- 
dies, called Cynometra caulifiora. ‘This very leafy 
tree has no flowers, but at the foot of its stem; its 
leafy top never produces any, 
§ 286. 
The flower, we know, (§ 66), consists of calyx, 
corolla, nectaria, stamens, and pistil. 
The calyx and corolla are, with regard to the 
structure and distribution of their vessels, entirely 
like the leaves. ‘The calyx, when green, as well as 
the leaves, transpires oxygen gas in sunshine; but 
no transpiration takes place when it has any other 
colour, Both calyx and corolla imbibe the neces- 
U 3 sary 
