408 Wicut: ErirricHum IN NortH AMERICA 
Synopsis of the Species 
Dorsal surface of the nutlet margined with a ridge-like elevation, but without a 
toothed border. 
Leaves with a fine and rather loose or spreading pubescence; dorsal surface of 
the nutlets smooth or rather hispidulous ; flowers 4-6 mm. in diameter. 
1. £. elongatum. 
Leaves with a dense and closely appressed pubescence ; dorsal surface of the nutlet 
papillose and hispid with short bristly hairs ; flowers 7-9 mm. in diameter. 
2, E. Howard. 
Dorsal surface of the nutlet with a border of subulate or triangular teeth. 
Leaves with closely appressed, strigose pubescence; flowers in dried specimens 
9-13 mm. in diameter. 3. E. splendens. 
Leaves with rather loose, villous or hirsute pubescence ; flowers in dried specimens 
4-7 mm. in diameter, 
Dorsal surface of the nutlet ovate; teeth of the border about half the length 
of the body of the nutlet; flowers 4-6 mm. broad.. 4. E. argenteum. 
Dorsal surface of the nutlet nearly circular in outline, the teeth of the border 
as long as the body of the nutlet ; flowers 5-7 mm. broad. 
Flower cluster usually raised on a distinct, sparingly leafy stalk, commonly 
2-5 or sometimes even 12 cm. high. Lae 38 aretiotdes.’ 
Flower cluster sessile among the terminal leaves of the stem. 
6. E. Chamissonis. 
‘1, Eritrichum elongatum (Rydb.) 
Eritrichum aretioides elongatum Rydb. Mem. N. Y. Bot. Gard. 
e+ $27. - 1900)" 
A low and tufted or matted plant in external appearance very 
closely resembling FE. argenteum, but the pubescence commonly 
rather more loose and spreading and seldom with a silvery appeat- 
ance ; the closely overlapping leaves 5-8 mm. long, 1-5-2 mm. 
broad, oblanceolate, acute or obtuse, those on the flowering 
branches linear or oblong-linear ; flowering branches 1-6 cm. long ; 
flower cluster raceme-like or more or less compact: calyx lobes 
linear : corolla 4-6 mm. in diameter, its limb bright blue : nutlet 
usually shining, about 2mm. long on the inner angle, the dorsal 
surface usually smooth, very rarely with a few minute bristles, 
margined by a rather sharp, ridge-like elevation, but without 4 
toothed border. 
Two plants are cited by Dr. Rydberg, one collected June 26, 
1897, in the Spanish Basin, Montana, by Rydberg and Bessey 
(no. 4891) and the other collected in 1883 in the Belt Mountains, 
Montana, by Scribner (no. 173); the type, however, is not indi- 
cated and the first named plant is therefore here designated as 
such, a duplicate of which, in fruit, is in the United States Na- 
tional Herbarium. 
