Rhodora [FEBRUARY 
the following length, 2.5, 2., and 1.8 cm. respectively. As the 
shorter peduncled forms are invariably those from exposed 
positions obviously this difference in peduncular length is one 
of ecological variation in response to edaphic conditions. 
Isoëtes heterospora Eaton. Growing in 1-5 ft. of water, rocky 
shores of Lake Cowles where it was very abundant. This 
locality is its second in Maine (Jordan Pond, Mt. Desert, 
being the other) and extends its northern limit about 125 
miles as well as its altitudinal limit some 100o feet. 
Tsoétes echinospora Braunii Eng. Common in 1-2 ft. of water, 
rocky shores, Lower Basin Pond (2500 ft.). It is interesting in 
this respect to note the occurrence of this species in the Lake 
of the Clouds (3500 ft.), Mt. Mansfield, Vt. 
Potamogeton confervoides Reichb. Sparsely growing in 1 foot 
of water, Lake Cowles. 
Scheuchzeria palustris L. Abundant as a pioneer in the 
sphagnum bog, Great Basin. 
Zizania sp. Common in Middle and Lower Basin Ponds; 
North West Basin Ponds. 
Brachyelytrum erectum Beauv. Along path leading from 
Camp Kennedy to Chimney Pond. Not common. 
Poa alpina L. Rare on the West walls of the North Basin at 
4500 ft. 
Bromus ciliatus L. Common in the alpestrine meadow society 
at the foot of the dripping West walls of the North Basin ; in 
a similar habitat South West wall of North West Basin. 
Eriophorum gracile Koch. Common in the sphagnum bog, 
Great Basin. 
Carex pauciflora Lightf. Common in the sphagnum bog, 
Great Basin. 
Carex intumescens Rudge. Frequent in meadow society at 
base of the dripping West wall of the North Basin; in similar 
habitat, base of North East wall of North West Basin; meadow, 
Dry Pond. 
* Juncus articulatus L. Characteristic of the boggy shores of 
* 
Lower Basin Pond. ; 
Smilacina trifolia Desf. Very characteristic of the border of 
the sphagnum bog, Great Basin. 
Habenaria obtusata Rich. Abundant in the mesophytic woods 
