EXPLANATION OF PLATE VI. 
Fig. 1. Casuaeina. (Family Coni/eriE.)* A large tree of New Holland. Trun^ 
thick, head branched ; branches flexible, pendent, verticillate, articulated. Monoecia 
Monandria. 
_ Fig. 2. Agave americanaA (Family Narcissi.) A succulent plant which grows 
m South America. Leaves radical, crowded, more than four feet long, tapering grad- 
ually to a point, channelled, bordered -^ith spinose teeth. Scape more than 20 feet 
highj Cyhndric, rectilinear, vertical, with scattering, scale-like, appressed leaves. Pan- 
icle simple, pyramidal. Flowers erect, numerous, grouped at the extremhy of a long 
peduncle. This magnificent plant belongs to Hexandria Monogynia. 
Fig. 3. Stizolobium aUissimnm. "(Family Leguminosoil) 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- 
phia Decandria. 
Fig. 4. Passiflora guadrangularis.t Climbing plant of warm regions of Ameri- 
ca. Stem quadrangular, slender, cirrose. Leaves alternate, petioled, 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 geronanica.% _ (Family Iridece.) 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. HiFPvnvs vulgaris. Perennial plant growing in wet grounds. Stem ey- 
lindiicat', very simple. Leaves linear, verticillate. Flowers very small, verticillate. 
Monandria Monogynia. 
* Mirbel establishes a natural order, CasuarinesB, in which he places Ibis genus ; Lindley considers it ns be- 
longing to Myricefe. or the Gale tribe ; he says. " the nearest ajTiroach made by these pli^nts is to the Eim 
tribe, {Ulmaccfe,) and to the Birch tribe, (Betulineie,) fr.>m the former of wbi;-h tliey are readily known by 
their amentaceous flowers, and want of a periant!i ; from the hiUcr they are dis!in-;ui?hed by their erect 
ovules, aromatic leaves, and one celled ovary. Casiiarina has tiie Iioliit of a gigantic Eauisetam, (fern,) 
and can scarcely be compared with any other dicotyledonous tree." Brown considers the genus Casuarina 
a.s approximating to Conifera?, where it was placed by Jussieu, wiiose arrangement we have followed. 
t By Lindley, this is i)iacod in his natural order Bromeliacces, called Bromelice by Jussieu. The h;)bit of 
Agave is similar to that of Aloe in the order AsphodcTese. 
I Botanists are much divided with respect to that place in the natural method which the Fassion-fin^ver 
tribe should occupy. Jussieu and De Candolle, in view of the organization of the fruit, consi<ler if as nearly 
allied to CucurbitacciE. A separate order, PassifloreEe, is now established among botanists, tor this i itcest- 
mg 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. Lindiey 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 esseniial difference between the calyx and corolla, except one being the outer, the other tfie in- 
ner of the floral envelopes. " The nature of the filamentous appendages, or rays as fhoy 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 oeculiar 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, iridefe difter from the Narcissi and Am.aryllideas in being triandrous, with the anthers turned out- 
wards ;' from Orchideaj, to which they arc in some respects nearly allied, in (jot being gynandrous, and in all 
their anthers being distinct. 
