354 Introductory View of the 
four in number, lying uncovered at the bottom of the calyx ; 
and Angiospérmia (from the Greek, seed-vessel), the seeds 
being enclosed in a capsule. In addition to the characters by 
which this class is principally distinguished, there are, in the 
first order, so many points of gener at posorabtanees that a very 
little experience will enable the young botanist to detect them 
at sight. One glance at the flowers 
of the ground-ivy, Glechoma hede- 
racea (fig. 91.), and the white dead- 
nettle, Lamium album (Vol. I. p. 429. 
fig. 186.), will give a better idea of 
this order than : any explanation that 
I have space to offer. Here are placed 
many of our aromatic herbs, as mint, 
thyme, marjoram, balm, lavender, 
hyssop, &c. The form of the corolla 
is much more varied in the second 
order than in the first: in some ge- 
nera it is elongated into a spur at the 
base, and the mouth closed ; in others, 
the tube is simply cylindrical, and 
the mouth open; some have a bell-shaped corolla, as the fox- 
glove; while afew, more regularly formed, are less strikingly 
characterised by their general air, as the Linnze‘a, an elegant 
little plant, bearing the name of the illustrious Swede, and, 
like himself, saz generis. As there is one Linnzus, so is there 
one Linneze‘a, descr ibed by himself as * a little northern plant, 
long overlooked, depressed, abject, flowering early.” He 
might have added, — standing alone in systematic botany, 
whether natural or artificial ; and occupying an elevated sta- 
tion, in which nature had placed, and time would preserve, it. 
Among the more remarkable exotics of this order are the 
trumpet-flower (Bignonza); the celebrated Acanthus of the 
architect; and the calabash tree, of the fruit of which, the 
pulp being scooped out, the rind is used as a basin to contain 
liquids. ‘This order is also remarkable for the number of its 
genera, named in honour of botanists, among whom (not to 
mention their great sovereign Linnzus) we find Gesner, 
Thunberg, Gmelin, Haller, Gerard, Sibthorp, Celsius, &c. 
The fifteenth class, Tetradyndmia *, is distinguished by six 
stamens, of which four are longer than the other two. It is 
composed of the cross-shaped, botanically termed cruciform, 
flowers. They have a calyx of four leaves, a corolla of four 
* The words Didynamia and Tetradynamia haye been differently, but 
not satisfactorily, derived. : 
