1900] Williams, — Bartonia iodandra, in the United States 55 
BARTONIA IODANDRA,— A SPECIES NEW TO THE 
UNITED STATES. 
EMILE F. WILLIAMS. 
(Plate 15, figs 1-7.) 
Ow September 23, 1894, while botanizing in the Blue Hills Park 
Reservation, near Boston, Dr. Geo. G. Kennedy and the writer col- 
lected several plants of Bartonia, which, to their surprise, were growing 
in sphagnum in a cedar swamp. Their appearance was altogether 
different from that of Bartonia tenella, a species very common in this 
region, but as Gray's Manual provided no other berth for them, I 
referred them to this species, thinking the difference in appearance 
might be due to the unusual habitat in which I found them. Hitherto 
I had always collected Bartonias in dry cranberry bogs, in pastures 
and springy fields and even once on a sunburnt ridge of Green Moun- 
tain, at Mt. Desert, but never before in deep shade nor in peat moss. 
In August, 1894, Dr. B. L. Robinson and Mr. H. von Schrenk 
secured some specimens of a Bartonia in a small sphagnum bog near 
Holyrood, on Conception Bay, Newfoundland. ‘These specimens were 
at first taken to be the obscure species Centaurel/la Moseri, Steud. & 
Hochst., and as Centaurella had long since been reduced to Bartonia, 
the plants were distributed as Bartonia Moseri, Rob. & Schrenk; but 
in July, 1898, Dr. Robinson found it necessary to place them in a new 
species which he called Bartonia iodandra, from the purple color of 
the anthers. 
I had never felt satisfied with the disposition made of my Blue 
Hills specimens, and having occasion lately to visit the Gray Her- 
barium, I submitted my material to Dr. Robinson, who pronounces it 
. to be Bartonia iodandra. My specimens, however, have yellow anthers, 
but in other respects the flower agrees perfectly with the type speci- 
mens from Newfoundland. Their habit likewise is the same, only they 
are much larger. The Newfoundland type is described as a delicate 
annual 4 to 12 cm. high, my plants are 12 to 25 cm. high. 
Bartonia tenella is usually an erect plant 6 to 20 cm. high, and the 
stem is either single or divided near the base into two, three or four 
erect branches. The base is more or less thickly covered with bract- 
like, mostly opposite scales. "The flowers are terminal on short, mostly 
1 Botan. Gazette, Vol. 26, pp. 46-48, July, 1898. 
