EXPLANATION OF PLATE VL 
Fig. 1. Casuarina. (Family Conifercs.)* A large tree of New Holland. Truntf 
thick, head branched; branches flexible, pendent, verticillate, articulated. Monoecia 
Monandria. 
Fig. 2. Agave ameWcor?a.t (Family A'arcissi.) 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 S.O feet 
high, cylindric, rectilinear, vertical, ^vith scattering, scale-like, appressed leaves. Pan- 
icle simple, pyramidal. Flowers erect, numerous, grouped at the extremity of a long 
peduncle. This magnificent plant belongs (o Hexandria Monogynia. 
Fig. 3. SrizOLOBruM altissimmn, (Family Leguminosce.) A cHmbing plani 
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 qnadrangularis.t Climbing plant of warm regions of Anuri- 
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 gerwanica.% (Family Irideee.) Herbaceous plant of Europe, three oi 
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, Casuarinese, in which he places this genus ; Lindley considers it as be- 
loriginsr to MjTiceae or the Gale tribe j he says. " the nearest appmach made by these plants is to the Elm 
tribe, (Ulmacea;.) and to the Birch tribe, (Betulinese,) from the former of which tlioy 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 Equiselani, (tern,) 
f»nd can scarcely be compared with any other dicotyledonous tree " Brown considers the genus Casuarina 
as approximating to Coniferae, where it was placed by Jussieu, whose arrangement we have followed. 
f By Lindley, this is placed in his natural order Bromeliaceaj, called BromeliiE by Jussieu. The habit of 
Agave is similar to that of Aloe in thf order Asphodelese. 
; 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 CucurbitacetE. A separate order. Passifiorese, is nov/estaljlished among botanists, for this i' tercst- 
in" 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 t.ave the 
ordinary position and appearance of calyx and corolla, the outer being green, the inner coloured ; second, 
there is no essential (iilference between the calyx and corolla, except one being- the outer, the other tiie 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 pn. cesses 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 staniens." 
The zealous Catholics who discovered them in the woods of South America, attached to the Ibrm of theii 
corolla ideas connected with their religious faith. 
§ The Iridr-a- differ from the Narcissi and Amaryllidese in being triandrous, with the anthers tu'-ned out- 
wards ; from Orchidea?, to which they are in somB resjiects nearly allied, in not being gynandrous, and in ao 
Iheir anthers bcin^ distinct. 
