. The Gardeners' chronicle : a weekly illustrated journal of horticulture and allied subjects. ut especiallyin temperate regions ; they could hardly be preservedas fossils ; they are classed by the late AlexanderBraun in the , which he characterises as hav-ing a strongly developed hypocotylcdonary axis, andby Le Maout and Decaisne are said to be intermediatebetween Aroidea; and Naiadeie. Sachs classes themin a group called CenttospermeK, from the centralposition of the seed in the order and in Naias, re-marking that the family Naiadea: is indefinable andshould be split up into several
. The Gardeners' chronicle : a weekly illustrated journal of horticulture and allied subjects. ut especiallyin temperate regions ; they could hardly be preservedas fossils ; they are classed by the late AlexanderBraun in the , which he characterises as hav-ing a strongly developed hypocotylcdonary axis, andby Le Maout and Decaisne are said to be intermediatebetween Aroidea; and Naiadeie. Sachs classes themin a group called CenttospermeK, from the centralposition of the seed in the order and in Naias, re-marking that the family Naiadea: is indefinable andshould be split up into several. Thus the LemnaccK unite two groups often placedwidely apart, being apparently on the whole moregenerabsed than either. The study of the Naiadeoe—which are almost as universally distributed, and occurin salt as well as in fresh water—may prove the Duck-weeds to be but an offshoot of this class. At present,however, to my imaginings, the lowly ancestors of thestill lowly Duckweeds may put in a claim to haveoccupied the proud position of the ancestors of allMonocotyledons. G. S, Boulgar,. Fig. 70.—auronia latifolia : hardy perennial: flowers yellow. colyledons were primarily aquatic. This may accountfor the prevalence of smooth (glabrous) leaves, charac-teristic of aquatic plants, in the group. The primitive Monocotyledon must have been farmore generalised than such genera as Acorus, An-thuriuni, Monstera, Richardia, Dieffenbachia, Colo-casia, Caladiura, Alocasia, Amorphophallus, or , the majority of the Aroideje are tropical,and among the most interesting conclusions of thenew science of Distribution are the generalisationsthat most large groups have originated in the north-west—the Nearctic or North American region—andmigrated still westward, the Atlantic being one of theoldest and most impassable of barriers. Orontiacea:and Callaceae are the most northern groups of Aroids,Calla palustris reaching 64° in North Europe. It isimportant to note here that Oro
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