The student's flora of the British Islands / by Sir J.D. Hooker.

  • Joseph Dalton Hooker
Date:
1884
Catalogue details

Licence: Public Domain Mark

Credit: The student's flora of the British Islands / by Sir J.D. Hooker. Source: Wellcome Collection.

    15/600 (page 11)
    SYNOPSIS OF THE NATURAL ORDERS (ADAPTED TO THE BRITISH GENERA). The arrangement of Dicotyledons here adopted adheres very closely 'to the Jussieuau as modified by De Candolle, which, notwithstanding its many defects (inseparable from a linear arrangement), is, I think, as good as any of those subsequently proposed,* and has the great advantage of being that most generally adopted in the Universities and Schools of Great Britain and America, and in systematic works everywhere. Its great defect is the necessity of an Apetalous division, embracing a hetero- geneous mass of Orders, which are incapable of being naturally grouped. Some of these are obviously allied to Polypetalous or Monopetalous Orders, but cannot be placed in contiguity with them without interfering with their other and closer alliances ; some again present cross affinities wit h two or more distant Orders ; and the greater proportion have no recog- nized near affinities. Under these circumstances, and seeing how much the retention of the Apetalous division facilitates the often difficult task of finding the Natural Order of a plant, it appears to be premature to depart from the Jussieuau system. NODOM L Phrenocamous or Flowerinjr plants. I'!;mts provided with stamens, and ovules which after fertilization become seeds containing an embryo. Class 1. Dicotyledonous or Exogenous plants. Slcm with bark, pith, and interposed wood ; when perennial increasing in diameter annu- ally by a layer of wood added to the outside of the old wood, and another t bark added to the inside of the old bark. Leaves with usually netted * Of these the principal ore : that <if Brongninrt, adopted in t.lio Paris Schools; nf Endlicher, in neon-.if the German Schools; of Krics, by vurioiiB botnnistn in Scandl- pavia ; and of Lfndley (The WgoUb!c Kingdom), which has beun partially followed in England and ludj» alone