CLASSIFICATION. 



297 



Asexual, or Flower less Plants* 



Sterna and leaves undistinguisliable 



rAlgales 



I. THALLOGENS &amp;lt; Fungales 

 Ujichenales 

 rMuscalea 



Stems and leaves distinguishable n. ACROGENS Lycopodales 



^Filicalea 



Sexual, or Flowering Plants. 



Wood of stem youngest in centre ; 

 cotyledon single. 



Leaves parallel-veined, permanent ; 



wood confused III. ENDOGENS 



Leaves net-veined, deciduous ; 

 wood, when perennial, arranged 

 in a circle with a central pith IV. DICTTOGENS. 



Wood of stem youngest at circum 

 ference, always concentric ; coty 

 ledons two or more. 



Seeds quite naked V. GTMNOGENS. 



Glumales 



Arales 



Palmales 



Hydrales 



Narcissalea 



Amomales 



Orchidales 



Xyridales 



Juncales 



Liliales 



Alismales 



beeds enclosed in seed-vessels VI. EKOGENS 



f Diclinous 



Hypogynous 



Perigynous 



.Epigj nous 



r Amen tales 

 I Urticales 

 | Euphorbiales 

 ^ &c. &c. 

 rViolales 



J Cistales 

 I Malvaies 

 1 &c. Ac. 

 fFieoidales 



J Daphnales 

 | Resales 

 * &c. &c. 

 fCampanales 



J M.vrtales 

 j Cactales 

 * &amp;lt;&c. &c. 



Here, linear arrangement has disappeared: there is a 

 breaking up into groups and sub-groups and sub-sub-groups, 

 which do not admit of being placed in serial order, but only 

 in divergent and re-divergent order. Were there space to 

 exhibit the way in which the Alliances are subdivided into 

 Orders, and these into Genera, and these into Species ; the 



the parts no longer needed, abort, and those parts develop which favour the 

 preservation of the race. Similarly in the Rhizogcns, the abortive development 

 of the leaves, the absence of chloropnyll, and the imperfect supply of spiral 

 vessels, are changes towards a structure fit for a plant which lives on the juices 

 absorbed from another plant; while the rapid and great development of the 

 fructifying organs, are correlative changes advantageous to a plant, the seeds of 

 which have but small chances of rooting themselves. And just the same reason 

 that exists for the production of immensely numerous but extremely small eggs 

 by Entozoa, exists for the production by Rhizogens^ of seeds that are great ij 

 number and almost spore-like in size. 

 SO 



