52 Rhodora [МАвсн 
longis, apice leviter emarginato; fructu suborbiculari 0.5-0.8 mm. 
diametro angulis rotundatis, stigmatibus celeriter deciduis.— Stems 
strongly compressed, ancipital, low, simple or subsimple, 5-25 mm. 
long; the internodes very short, 1-4 mm. long: leaves uniform, linear, 
2-7 mm. long, slightly emarginate at apex: fruit suborbicular, 0.5— 
0.8 mm. in diameter, the angles rounded; stigmas promptly deciduous, 
not observed in any of the mature specimens.— In silt and granitic 
gravel at the bottoms of alpine and subalpine ponds and lakes, Table- 
top Mountain, Gaspé Co., QuEBEc. Type collected in “Lac des 
Américains," altitude 670 m., western base of Table-top Mt., August 
1, 1906 (Fernald & Collins, no. 234). Observed in many other 
lakes and ponds up to an altitude of 1150 meters. Ordinarily the 
plant, which is quickly distinguished from C. heterophylla by its small 
size, uniform foliage, ancipital stem, and promptly deciduous stigmas, 
grows in deep water with Subularia aquatica, Isoëtes macrospora, etc., 
and shows no inclination to lengthen its stem and to reach the surface. 
Occasionally it is stranded at the margins of lakes when it becomes 
very dwarf, with closely crowded shorter uniformly linear-oblanceolate 
leaves. 
RHUS CANADENSIS Marsh., var. iliinoensis (Greene), n. comb. 
Schmaltzia illinoensis Greene, Leafl., i. 131 (1905).— A shrub of 
central Illinois differing from the typical form of the species in its 
greater pubescence. 
SPHAERALCEA remota (Greene), n. comb. Шатта remota Greene, 
Leafl., i. 206 (1906). Sphaeralcea acerifolia Gray, Syn. Fl. i. 317, 
as to Illinois plant, not Nutt. in Torr. & Gray, Fl., i. 228.— Professor 
Greene has shown very clearly that the local plant of a gravelly island 
in the Kankakee River, near Altorf, Illinois, is specifically distinct 
from the northwestern plant described by Nuttall as S. acerifolia. 
MYRIOPHYLLUM HUMILE (Raf. Morong, forma natans (DC.), 
n. comb. M. ambiguum Nutt. Gen. ii. 212 (1818). М. ambiguum, 
var. natans DC. Prodr. iii. 70 (1828).— Rafinesque's Burshia humilis 
(1808) was clearly the dwarf shore plant which has been known as 
Myriophyllum ambiguum, var. limosum Nutt., and, as the first specific 
name, must be retained for the species. 
MYRIOPHYLLUM HUMILE, forma capillaceum (Torr.), n. comb. 
M. capillaceum Torr. Compend. 355 (1826). M. ambiguum, var. 
capillaceum Torr. & Gray, Fl. i. 530 (1840). 
OSMORHIZA LONGISTYLIS (Torr) DC., var. villicaulis, n. var., 
