ASTER DIVARICATUS ALATUS 129 
His nephew, Wm. P. C. Barton (1786-1856) seems to have 
observed the plant alatus for some years before 1815, near Phila- 
delphia, and the specimen in his herbarium (Phila. Acad. Sci.), 
bears the printed label: 
* var. 3 alatus [mihi], alb., foliis profunde et acuminate serratis, longe 
acuminatis, petiolis alatis; Septembri." 
The same words also formed his description in his Prodromus 
Florae Philadelphicae, 1815. In 1818, in his Compendium Florae 
Philadelphicae, 2: 114, his description appears in English, as 
follows : 
‘© B alatus. Leaves deeply and sharply serrated, long acuminate ; petioles with 
broad wings, B.* — A. corymbosus 3 alatus, Bart. Prodr. Fl. Ph. This isa permanent 
variety of the preceding, which I have constantly observed, not only in this vicinity 
but in other parts of the U. S. Grows with No. 15.¢ July.” 
The next appearance of the variety in print was in 1836, in 
DeCandolle's Prodromus, 5: 265, as follows : 
“B alata e asi, m phil. 2, p. 114) petiolis latius et frequentius alatis. 
Varietas ex cl. auct. perma 
With the cree reference of DeCandolle the variety seems to 
have disappeared from notice. That its name a/atus had not been 
already used between 1753 and 1815 is perhaps remarkable ; the 
nearest approach to it before 1753 seems that of Cornuti, 1635, 
who described Helenium autumnale as Aster luteus alatus. 
It is to be noted that in 1815 and earlier, Barton regarded his 
variety (as well as the type) as a September bloomer ; as indeed we 
Still find it. In 1818 he changed his original date of September 
to July. He had probably discovered some July-blooming relative 
and thought it the same as his original September blooming 
plants. Very likely the July-flowering species was our present 
A. umbelliformis, which was already collected in that part of 
Pennsylvania, occurring as it does in Muhlenberg's herbarium, 
and labelled by Muhlenberg as “ A. corymbosus.” 
That Barton’s original a/atus of 1815 was not founded on one 
of the slightly toothed July- and August-blooming curvescentes 
is indicated by his own character of 1815, 
** profunde et acuminate serratis,' 
* B. was appended by Barton to his original descriptions. 
t A. divaricatus L. 
