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in which there are blue, yellow and searlet in varieties 
of the same species. Two species and their varieties were 
the only Dahlias known to English gardens for many 
years, as, though a few kinds were introduced from time 
to time from France and Spain, yet, as they did not 
hybridize with the others, and were rather more tender, 
they were not generally cultivated, and appear to have 
been soon lost. Most of these have, however, been rein- 
troduced from: Mexico, with severai new species, within 
the last few years, and there are now ten or twelve dis- 
tinct species, besides innumerable varieties of Dahlia 
Variabilis. The most remarkable of the new species is 
the tree Dahlia, Dahlia Excelsa, which is said to grow in 
Mexico thirty feet high, with a trunk thick in propor- 
tion. The Dahlia is the grandest Autumn flower we 
have. Nothing is its equal in any respect in September 
and October. It is in its glory when everything else is 
fading, and surrenders cnly to the Frost King. The long 
late Fall in the South is especially suited to its culture, 
as it is at that season it attains its greatest perfection. 
Our Dahlias here in October make such a gorgeous dis- 
play that we wish the Fall might last forever, and in the 
more Southern States, where frost keeps away much 
longer, the season of their enjoyment is so great that 
they are most popular and very extensively grown. 
Dahlia Imperialis, a distinet species, attains a height of 
ten to fifteen feet, and is of a fine branching form, pro- 
ducing late in the Fall, pure white, drooping, lily-like 
flowers, three inches in diameter. It flowers rather late, 
but it isa magnificent plant in any section of the country 
where frost holds off until the loth of November. A new 
section has been introduced in England with single 
flowers, that make distinct and interesting bedding 
plants, as they flower in great profusion. The flowers so 
