434 Scientific Intelligence. 
yet it is still between those two genera that the limits are placed by uni- 
versal consent; so are they as irrevocably fixed between the closely 
allied genera Teucrium and Vitex, which form the connecting link be- 
tween Labiate and Verbenaceew. The vast orders of Umbellifere and 
cences of Horsfieldia and some others in the former, and of Xanthiwm in 
the latter, which at first sight disguise their characters. The few species 
of Apostasiew are but anomalous Orchidee, rather explaining their struc- 
ture than connecting them with any particular order. Cyperacew and 
Graminee retain their typical structure through all the singular modifi- 
cations hitherto observed. 
“There are other orders again, even amongst the most numerous in 
nd 
pen and others again propose uniting more or less of these 
grou h Malvacee. The Memecylee are in the eyes of some botanists 
one or two intermediate families between Melastomacee and , 
whilst for others they are but a tribe of the former. So it is with the 
connecting groups between Myrtaceae and Passifloree, between the latter 
and Cucurbitacee, &c. Amongst some of the largest and most univer- 
sally oo Monopetalous orders the connexion is still more gradual, 
and the limits proposed more arbitrary. There can be no doubt that 
Rubiacew, Apocynee, Gentianew, and Scrophularinee are large independ- 
ent orders, indicated in nature, yet those genera now amalgamated under 
the name of Logamiacee bind them so firmly together, that some of them 
will be found even more closely allied to certain others of each of the 
above orders respectively than they are to each other. On the other side, 
Scrophularinee themselves pass imperceptibly into Solanee, Bignoniacee 
or Convolvulacee, and through these into several others. 
Since the meta hor of a chain or linear series has been found inade- 
quate for the illustration of the connexion of the natural groups, that o! 
mb te area or map has been more generally resorted to. In 
gm and Myrtacee, the Myrtacee and Passifloree, these again an 
Cucurbitacee, would not be separated by any clear open space, but 
by a tract still wooded, but of less density, in which here and there the 
_ be so thinly scattered as almost to break the connexion. 
