NORTH AMERIOAN AMARELLA. 55 
the corolla ovate-oblong, acute, half as long as the tube; fringe 
of the crown copious, rather short. 
Along the Pacific seaboard from Vancouver Island, Macoun, 
21 July, 1893, southward into Washington and Oregon. 
A. CONFERTA. Stout and rigid, erect and simple, with only 
very short fascicled flowering branches and pedicels in the axils 
of the leaves and not exceeding them; internodes an inch long 
more or less, subterete, with only traces of angularity: leaves 
rather succulent, oblong, not subcordate, an inch long or less: 
flowers less than 4 inch; calyx large, nearly or quite equalling 
the corolla-tube, not very deeply cleft, the segments oblong and 
lance-oblong, acute, delicately but closely scaberulous on the 
margin, the sinuses open and obtuse, segments of the corolla 
oval, obtuse; crown conspicuous. 
Chaplin, Assiniboia, 28 Aug. 1895, Mr. Spreadborough, spec- 
imens communicated by Mr. Macoun, but the label bearing no 
number. Species strongly marked in both habit and character. 
A. SCOPULORUM. Stoutish, simple or with many branches 
from the base, mostly 6 to 12 inches high, the stem faintly ang- 
ular, internodes in larger plants 1 to 3 inches long: middle- 
stem-leayes oblong, obtuse, 1 to 14 inches long, 3-nerved, the 
lowest obovate and spatulate, the uppermost oblong-linear, acute: 
flowers several in each axil, usually on a short branch, more 
numerous at summit, commonly about ? inch long; longer sepals 
of the very deeply cleft calyx almost equalling the corolla-tube, 
all of them linear, acute, the sinuses obtuse: ovate-lanceolate 
segments of the corolla acute, the appendages deeply and finely 
fimbriate. 
Common species of the Rocky Mountain region from Colo- 
rado to Montana; often collected and everywhere distributed in 
the herbaria. 
A. REvoLUTA. Near 4. scopuloram, but smaller, only 5 or 6 
inches high, much more densely leafy and floriferous, the inter- 
nodes mostly less than an inch long, the ovate-lanceolate revo- 
lute leaves nearly as long: corolla little more than 4 inch long: 
calyx-segments shorter than the corolla-tube, two of them spatu- 
late-linear, two oblong or oblong-linear, the sinuses obtuse : 
