ie ah td a se E : 
fia ‘S tructural and Ph ysiological Botany. F ere) 
is petaloid ; the dry scarious perianth of grasses is ee Wee 
ceous; that of the catkins of many forest-trees scaly. Simi- 
lar terms may be applied to the pe-— 
rianth as to the calyx and corolla, with 
respect to the form, size, number, and 
arrangement of its separate parts. It 
may be gamophylous or symphyllous - 
[‘ monophyllous ’] on the one hand; or, on 
the other hand, apophyllous or eleuthero- 
\S phyllous |‘ polyphyllous. "|. It may be dece- 
@uous, as in orchis, or fersestent, and may 
then become accrescent and dry as in the — 
: hazel-nut, or succulent as in the mulberry. 
Fic. 258.--Double se- 
paioid perianth of Rv- In the latter cases and some others, as 
mex acetosa (magni- 
fied): heumex and Hippophaé, it takes an impor- 
Fic. 259. — Longitu- Fic. 260.—I. Staminate flower; II. pistillate flower ; 
dinal section through IIT. section of the fruit of the stinging-nettle, U/7- 
the sepaloid perianth tica dtotca (magnified). 
of the elm (magnified), 
tant part in the formation of the fruit. [Under this head 
come the falee and lodicules of grasses, and the raed | ryniuMe 
of sedges. | 
/ { 
SUBSIDIARY ORGANS OF THE FLOWER. 
By subsidiary organs are meant appendages to the flower 
of various kinds which cannot be included either among 
the floral envelopes or the essential organs of the flower. 
The corona or paravorolla is a whorl of leaf-like or fili- 
form organs, often brightly coloured, intervening between 
