234 BOTANICAL GAZETTE. [Sept., 
throat of the corolla, manifestly below the orifice: in anthesis 
they do not show at all; later they may slightly project. Ac- 
cording to Seemann’s figure the “not quite ripe” capsule is 
ovoid and slightly longer than the calyx. This figure accords 
well with the specimens from coll. Wright, of Arakamtchetchene 
Island, Behring Strait ; from Arctic Alaska, Muir; and Lake Lin- 
deman at the head of the Yukon, Lieut. Schwatka. Originals from 
Chamisso, and part of those from St. Lawrence Bay, Eschscholtz, 
are similar but smaller. 
ar. DENTATUM. Larger: leaves with blade from one or two 
to three or nearly four inches long (in the dried specimens thin), 
oval or ovate to oblong, commonly repand or sparingly dentate, 
at base abruptly or truncately contracted into long and wing- 
margined petioles: scapes a span to a foot high, 2-7-flowered: 
corolla so far as known white: capsule globular- to obléng-ovoid, 
moderately surpassing the ovate or triangular-acuminate calyx- 
lobes, half-5-valved.—D. dentatum Hook. F1.i.119. D. Meadia, 
var. frigidum Watson, Bot. King Exp. partly. D. Meadia, var. 
latilobum Gray, Syn. Fl.l.c. The “N. W. Interior, Douglas” is 
probably interior of Oregon. Lyall collected it in 1850 on the 
east sides of the Cascade Mountains in Washington Terr. ; Bran- 
degee in the same region in open woods in 1883; Suksdorf in 
1885, at the foot of a waterfall near Bridal Veil in N. E. Ore- 
gon; Henderson in 1884 and 1885 on wet rocks, along bluffs of 
the Willamette ; Howell near the Cascades in 1886. The most 
southern and remote station is that of Watson in the Wahsatch 
Mountains, Utah, at the head of Cottonwood Cafion. It has all 
the essential characters of D. frigidum, but is much larger. 
The Development of the Gymnosporangia of the United States.* 
W. G. FARLOW. 
The study of the connection between the different forms of 
Gymnosporangium and Roestelia known in the United States has 
not been by any means as simple as the similar study in Europe. 
This is owing, perhaps, to the fact that we have about double the 
number of species found in Europe, and it has not always been 
easy to determine exactly which of our forms were the same aS 
those of Europe, or even clearly to define our own species. Be- 
fore one could begin to study the connection between the Gym- 
_hosporangia and Roestelie, it was necessary to have a compara- 
*Read before the A. A. A. S., Buffalo meeting, 1886. 
