222 THE VEGETABLE WORLD. 
SexvuaL orn FLowERING PLANTs. 
The Rhizogens are a aay of anoma- 
lous plants, mostly leafless and parasitical, 
having the loose cellular organisation of 
0 
ler soe springing from } cellulai 
ee aac a Thallus 4 and root, and seems to be snalagenell sae. 
hallus of the Fungi. Th oe flowers | 
semble those of more perfect plants; their — 
sexual — are Degg ope bat heir Fe, : 
which is without any vis ~ piper 
cotyleden, peu g appears spherical 
or be homogeneous m: 
Fructification ying 
Stem. Wood of s' ne 
the centre ; p trae Reg cise: 
Leaves parallel gone: S spieet 
nt woody stem c 
IV. ENDOGENS . trunk * fdisk ae of bundles of 
weed of * Lge eer gon gens by the roots, which have no no concen- 
V. DICTYOGENS « f nial, eine ric =e a nd the leawes f sve. Ete the stem 
as in th 
are Exogen ar ited 
ve ae tigma, the reproauativ® aye 
bel “sig d that the pollen falls 
immediately upon the ovules, & peculiarity 
a = ot stern occurs among reptiles 
tee datenes se se vod 
peer the bark. te Soa = se 
more, Seeds qui 
V1. GYMNOGENS 
|g if 
) “i 
Ee duous ; leaves net-veined ; ee are distinguished from 
pith. =I 
petgons Saal innemnerslit cases 
navies exorhizal germination ot 
it or more cotyledons ; leaves ‘ 
: rw alone, arran, 
VII. EXOGENS . .} Seeds enclosed in seed vessels. < a central pith, either in concentric rings oF 
inah ass, but > i 
medullary plates forming Tra. 
centre to the circumference, and reproduced 
on ee of the trunk; whence 
y, \ oa 
