EXPLANATION OF PLATE VI. 
Fig. 1 . Casuarina. (Family Coniferce.)* * * § A large tree of New Holland. TrunA 
thick, head branched ; branches flexible, pendent, verticillate, articulated. Moncecia 
Monandria. 
Fig. 2. Agave americanci. t (Family Narcissi.) A succulent plant which grows 
in South America. Leaves radical, crowded, more than four feet long, tapering grad¬ 
ually to a point, channelled, bordered with spinose teeth. Scape more than 20 feet 
high, cylindric, rectilinear, vertical, with scattering, scale-like, appressed leaves. Pan¬ 
icle simple, pyramidal. Flowers erect, numerous, grouped at the extremity of a long 
peduncle. This magnificent plant belongs to Hexandria Monogynia. 
Fig. 3. Stizolobium altissimum. (Family Leguminoscz.) A climbing plant 
which ascends the loftiest trees of the equatorial region. Stem flexible. Leaves al¬ 
ternate, pinnate, trifoliate. Peduncle axillary, filiform, very long, pendent, terminated 
by an umbel of large and beautiful flowers. Legume acinaciform, wrinkled. Diadel- 
pnia Decandria. 
Fig. 4. Passiflora quadrangular is.t Climbing plant of warm regions of Ameri¬ 
ca. Stem quadrangular, slender, cirrose. Leaves alternate, petiolea, oblong-oval. 
Tendrils axillary. Flowers large, axillary. Berries large, ellipsoid. 
Fig. 5. Cyperus papyrus. Herbaceous plant, perennial, aquatic ; fifteen feet high; 
a native of Egypt. Stem erect, three-sided, aphyllous, sheathing at the base; umbels 
large, terminal, compound, with an involucrum and an involucel. Triandria Mo¬ 
nogynia. \ 
Fig. 6. Iris germanica.% (Family Iridecc.) Herbaceous plant of Europe, three or 
four feet high, with a perennial root. Leaves radical, equitant, compressed, ensiform. 
Stem leafy, branching at its summit. Flowers terminal. Perianth simple, six-lobed; 
three lobes exterior, reflexed ; three lobes interior, erect. Triandria Monogynia. 
Fig. 7. Hippurus vulgaris. Perennial plant growing in wet grounds. Stem cy¬ 
lindrical, very simple. Leaves linear, verticillate. Flowers very small, verticillate. 
Monandria Monogynia. 
* Mirbel establishes a natural order, Casuarine®, in which he places this genus ; Lindley considers it as be¬ 
longing to Myriceae, or the Gale tribe ; he says, “ the nearest approach made by these plants is to the Elm 
tribe, (Ulmace®,) and to the Birch tribe, (Betuline®,) from the former of which they are readily known by 
their amentaceous flowers, and want of a perianth ; from the latter they are distinguished by their erect 
ovules, aromatic leaves, and one-celled ovary. Casuarina has the habit of a gigantic Equisetam, (fern,) 
and can scarcely be compared with any other dicotyledonous tree.” Brown considers the genus Casuarina 
as approximating to Conifer®, where it was placed by Jussieu, whose arrangement we have followed. 
t By Lindley, this is placed in his natural order Bromeliace®, called Bromelias by Jussieu. The habit of 
Agave is similar to that of Aloe in the order Asphodelese. 
j Botanists are much divided with respect to that place in the natural method which the Passion-flower 
tribe should occupy. Jussieu and De Candolle, in view of the organization of the fruit, consider it as nearly 
allied to Cucurbitace®. A separate order, Passifloreae, is now established among botanists, for this interest¬ 
ing tribe of plants. Jussieu considered that the parts taken for petals, are nothing but inner divisions of the 
calyx, usually in a coloured state, and wanting in some species. Lindley considers the outer species of the 
floral envelopes as the calyx, and the inner as the corolla, for two principal reasons ; first they have the 
ordinary position and appearance of calyx and corolla, the outer being green, the inner coloured ; second, 
there is no essential difference between the calyx and corolla, except one being the outer, the other the in¬ 
ner of the floral envelopes. “ The nature of the filamentous appendages, or rays as they are called,” says 
Lindley, “ which proceed from the orifice of the tube, and of the processes which lie between the petals and 
stamens, is ambiguous. I am disposed to refer them to a peculiar form of petals rather than to stamens. 
There can be no doubt, at least, of their being of an intermediate nature between petals and stamens.” 
The zealous Catholics Who discovered them in the woods of South America, attached to the form of their 
corolla ideas connected with their religious faith. . . , , 
§ The I ride® differ from the Narcissi and Arnaryllide® in being triandrous, with the anthers turned out¬ 
wards ; from Orchideae, to which they are in some respects nearly allied, in not being gynandrous, and in all 
their anthers being distinct. 
