. The vegetable kingdom : or, The structure, classification, and uses of plants, illustrated upon the natural system. eloping a two-lobedplumule; and hence the Order was referred to Endogens, or Monocotyledons, andplaced in the vicinity of Hydrocharads. But it is now well known that Richardscotyledon is a vitellus, analogous to that of Peppers, Gingerworts, and others ; andthat what Richard and his followers denominated plumule, is a 2-lobed embryo, whencethe Order is more generally placed in Exogens, or Dicotyledons. Even Von Martms,who once adhered to the opinion that Waterlilies are monocot
. The vegetable kingdom : or, The structure, classification, and uses of plants, illustrated upon the natural system. eloping a two-lobedplumule; and hence the Order was referred to Endogens, or Monocotyledons, andplaced in the vicinity of Hydrocharads. But it is now well known that Richardscotyledon is a vitellus, analogous to that of Peppers, Gingerworts, and others ; andthat what Richard and his followers denominated plumule, is a 2-lobed embryo, whencethe Order is more generally placed in Exogens, or Dicotyledons. Even Von Martms,who once adhered to the opinion that Waterlilies are monocotyledonous, and nearlyrelated to Hydrocharads, (see Ilortus Rerjkis Monacemis, p. 25.) now places the Ordernear Crowfoots (see Conspectus, No. 188). Those who are curious to exammc thediflFerent opinions on this subject are referred to De Candolles Memoir, m the firstvolume of the Transactions of the Physical and Natural History Society of Geneva. Fig. CCLXXXVll.—Nymphaea alba. 1. the pistil; 2. a perpendicular section of a seed ; 3. half anembryo, showing the great plumule lying in the cavity of one 410 NYMPH^ACE^. [Hypogynous Exogens. It seems, however, desirable to state, in this place, what the reasons are which haveled so many modern Botanists to place the Order in the class of Exogens. If therhizome of Nymphsea is examined it will be fomid to consist principally of cellulartissue, with a very confused distiibution of fibrovascular bundles among it, not at alllike that of Exogens, but more resembling what occurs in succulent Endogens, Bijt,according to Mu-bels examination of the anatomy of the roots of Nuphar luteum, in theAnrmles du Museum, vol. 16, pi. 20, the bundles of fibres are there placed in a con-centric circle, the yomigest being outermost. Secondly, the leaves are those of Dico-tyledons, and so is their convolute vernation, which is not known ni Monocotyledons,together with then* insertion and distmct articulation with the stem. Tliirdly, theflowers
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