1915] Fernald, Botrychium angustisegmentum 87 
BETULA GLANDULOSA Michx. var. sibirica (Ledeb.) n. comb.— 
B. nana Ledeb. Fl. Alt. iv. 247 (1833), not L. B. rotundifolia Spach, 
Ann. Sci. Nat. ser. 2. xv. 194 (1841). B. nana L. B. sibirica Ledeb. 
Fl. Ross. iii. 654 (1849-51). B. glandulosa Michx. var. rotundifolia 
(Spach) Regel in A. DC. Prod. xvi. pt. 2. 172 (1864).— The form of 
Betula glandulosa with prostrate or procumbent branches and orbicular 
or reniform-orbicular leaves was first distinguished by Spach as B. 
rotundifolia, based on a specimen in the Paris Herbarium collected by 
Ledebour in Siberia and labeled by him B. nana. I have not seen the 
type, but have examined specimens from the Altai, 1844, collected by 
Ledebour, in the Barbey-Boissier Herbarium near Geneva, likewise 
labeled B. nana by Ledebour himself, which are identical with the 
plant generally called B. glandulosa var. rotundifolia. There is also a 
specimen of this form in the British Museum from the shores of the 
Lena in Siberia, collected 12 May, 1882, by Bunge, and labelled B. 
nana L. var. sibirica Led.  Ledebour's B. nana 8. sibirica was based 
on B. rotundifolia Spach, and should be adopted, being much the older 
varietal name.— SIDNEY F. BLAKE, London, England. 
BoTRYCHIUM angustisegmentum (Pease & Moore), n. comb. B. 
lanceolatum, var. angustisegmentum Pease & Moore, RHODORA, vili. 
229. (1906).— Botrychium lanceolatum (Gmel.) Angstr. is a plant of 
boreal Europe, Asia, northwestern America and Greenland. In 
Europe the plant belongs to the Subarctie and Arctic-alpine floras, 
in northern Scandinavia and Finland, and locally in the Alps. In 
North America it occurs within the Arctic Circle in Greenland (lati- 
tude 63? N.) but is unknown elsewhere in the East; in the West it 
extends from the Aleutian Islands to Mt. Rainier in Washington and 
the Selkirk Mts. in British Columbia. South and east of these 
mountain stations 1ts occurrence is doubtful, for although often said 
to reach Colorado, it is noteworthy that in preparing his Flora of 
Colorado Rydberg was unable to verify its occurrence there. 
B. angustisegmentum, on the other hand, is a typical plant of the 
rich deciduous Appalachian forests, commonly in the shade of beech 
or sugar maple, occurring from the St. John Valley, New Brunswick, 
to eastern and southern Ontario, Ohio, Pennsylvania and New Jersey, 
with its area of greatest development from western Maine to central 
