552 MACKENZIE: NOTES ON CAREX 
the body short-oval, triangular-orbicular in cross-section, about 1.75 
mm. long and 1.4 mm. wide, short-pubescent, 2-ribbed, otherwise 
nerveless, abruptly short-(0.5 mm. long) stipitate, abruptly con- 
tracted into a beak about length of body, the beak 2-edged, hyaline- 
tipped, bidentate; achenes triangular, oblong-obovoid, filling peri- 
gynia, dull or silvery blackish, minutely roughened, the superficial 
cells conspicuous, sessile, the sides convex, and angles sharp and 
narrow; style slender; stigmas three. 
Carex pennsylvanica Lam. and Carex heliophila Mackenzie at 
times develop pistillate spikes on subradical peduncles. The long 
stolons characteristic of these species afford the easiest means of 
distinguishing such specimens from Carex umbellata and its allies. 
It is possible that these specimens represent, to some extent at 
least, hybrids with the Carex wmbellata group as they are treated 
by Kiikenthal, but my own inclination is to regard them as above. 
SPECIMENS EXAMINED: 
CANADA: Bic, Rimouski County, Guide Forbes, June 23, 1905 
(K. M.); Point Pleasant, Nova Scotia, Macoun 16674, June 18, 
1883 (D. C.); Edmonton, Ontario, White 32017, May 24, 1893 
(D.€.); 
VERMONT: Middlebury, Brainerd, May 24, 1878, and June 9, 
1891 (B); Winooski, Brainerd, June 5, 1897 (B); Chipman Hill, 
Brainerd, May 30, 1897 (B). 
MICHIGAN: Port Huron, Dodge, June 3, 1894 (K. M.); Lake 
Harbor, Umbach, May 28, 1898 (K. M.); Orion, Oakland County, 
Wheeler, May 30, 1895 (C); Grand Lodge, Wheeler 47, May 5, . 
1890 (C). 
MAINE: Orono, Merrill, June 5, 1898 (N. Y.); Orono, Fernald, 
June 30, 1890. 
MASSACHUSETTS: South Ashburnham, Forbes, May 30, 1904; 
(K. M.); Manchester, Chamberlain (N. Y.); Cambridge, Mrs. 
Britton, May 12, 1889 (C); “‘Mass.,”” Dewey (D. C.). 
New York: Yonkers, E. C. Howe, May 1880 (N. Y.); ‘‘New 
York,” Crawe (C); ‘New York,” Gray, 1846 (C); Highlands of 
New York, Torrey (C). 
NEw JERSEY: High Point, Sussex County, Mackenzie 4564 and 
4571, May 29, 1910 (K. M.); Tuckerton, Mackenzie, May 1911 
M.). 
