Marshall—The Vegetation of Twin Island. 
Boripa obtusa (Butt.) Britton 
Triadenum virginicum (L.) Baf. 
Stellaria longifolia (Mubl.) Britton 
Popnlus tremuloides Michx. 
Salix linearifolia Bydb. 
Salix sp. 
Polygonum amphibium L. 
Polygonum lapathifolium L. 
Bumex brittannica L. 
Lysimachia terrestris (L.) B. S. P. 
Solanum nigrum L. 
Asclepias incarnata L. 
Mimulus ringens L. 
. Scutellaria galericulata L. 
Scutellaria lateriflora L. 
Lycopus americanus Mubl. 
Lycopus communis Bicknell 
Mentha canadensis L. 
Fragaria canadensis Micbx. 
Apios apios (L.) MacM. 
Alnus incana (L.) Willd. 
Cicuta bulbifera L. 
Galium trifidum L. 
Campanula aparinoides Pursh. 
Bidens cernua L. 
Eupatorium purpureum L. 
- Erecbtites hieracifolia (L.) Baf. 
Taraxacum taraxacum (L.) Barst. (?) 
VEGETATION OF THE BACK STRAND. 
This intermediate zone is transitional, as might be expected; 
of. some sixty species found upon it two-tbirds occur also on 
strand or center, about an equal number for eacb. Plants 
which need some shade and abundant moisture, but not a wet 
soil, predominated. Of such, are the sensitive fern (Onoclea 
■sensibilis L.) and the spotted touch-me-not (Irmpatiens biflora 
Walt.). Several species like the tall marsh grass (Spartina 
4—S. A. 
