BOTANICAL SYMPOSIUM. 
55 
Dr. Britton found other shrubs of the stellately pubescent Vi¬ 
burnum, showing it to be well distributed in the valley. 
A fine type of the common hackberry ( Celtis occidentalis) was 
noted near the boat landing. 
Wednesday, July 6. The morning was spent about the wooded 
islands and bottoms about the house and between canal and the 
river and the afternoon in ascending Rhodendron Ravine, west of 
the house. 
Dr. Joseph N. Rose took the chair in the evening. 
Dr. Britton itemized C.cdlitriche Austini and Tissa rubra and, 
in a small pool out on the rocks, a colony of Eleocharis, absolutely 
nothing else appearing in the pool but five species of this genus, 
namely: E. acicularis, E. Engelmanni, E. palustris, E. palustris 
glaucescens and E. Smallii. McCall’s Ferry is one of the original 
localities for the last named. 
Messrs. Jahn and Van Pelt reported Coreopsis trip ter is, Allium 
cernuum and A. Canadensis, the lattfer two in fruit only; also 
Cardarnine rotundifolia . 
Dr. Waters found one clump of Phegopteris polypodioides, this 
making the second locality known between Columbia and Havre 
de Grace. 
The knieffias along the shore section were very puzzling and 
they elicited considerable discussion on the part of Messrs. Carter, 
Britton, Nash, Price and Rose by their variability in fruiting 
forms. 
Mr. Painter showed a good species of Sagittaria rigida from 
the canal; he also exhibited fruits of Galeorchis spectabilis. 
Miss Mulford spoke of the frequent occurrence of a decidedly 
red tinge to the stems, petioles and tips of flowers in a great num¬ 
ber of plants of Circaea lutetiana, but beyond this pigmentation 
there seemed no specific- differences. 
Dr. Britton referred to a broad leaved Rudbeckia found on one 
of the islands in the river. He also described more fully the hack- 
berries of the region, dwelling at length on Celtis canina of Raf- 
inesque. This is distinguished from C. occidentalis by its larger 
leaves, which are gradually acuminate instead of abruptly so and 
is a plant of the woodlands rather than rocky ledges. C. crassi- 
