1909] Bartlett, — Submarine Bog at Woods Hole 229 
been done, the species of each group are arranged as nearly as possible 
in the order of their abundance and the groups are separated by lines. 
A. Spartina glabra var. pilosa Merr. 
Limonium carolinianum (Walt.) Britton. 
Spergularia canadensis (Pers.) Don. 
Salicornia mucronata Bigel. 
Salicornia europaea L. 
Salicornia ambigua Michx. 
At the edge of the marsh where the waves have thrown up a little 
gravel occur also: 
Spartina patens (Ait.) Muhl. 
Distichlis spicata (L.) Greene. 
B. Spartina patens (Ait.) Muhl. 
Distichlis spicata (L.) Greene. 
Juncus Gerardi Lois. 
Limonium carolinianum (Walt.) Britton. 
Triglochin maritima L. 
Gerardia maritima Raf. 
Low muddy spots within this zone, from which tide water drains more 
slowly than from the Spartina patens turf, contain part or all of the 
following flora. 'They should perhaps be associated with zone A. 
Limonium carolinianum (Walt.) Britton. 
Triglochin maritima L. 
Plantago decipiens Barneoud. 
Spergularia canadensis (Pers.) Don. 
Gerardia maritima Raf. 
Spartina glabra var. pilosa Merr. 
Distichlis spicata (L.) Greene. 
Scirpus campestris var. paludosus (A. Nels.) Fernald. 
At the landward edges of this zone, the water becomes much less salt. 
Here the Spartina patens and Juncus Gerardi grow much taller, and are 
associated with Agrostis alba var. maritima (Lam.) G. F. W. Mey. 
C Scirpus americanus Pers. 
Triglochin maritima L. 
Spartina patens (Ait.) Muhl. 
Pluchea camphorata (L.) DC. 
Ptilimnium capillaceum (Michx.) Raf. 
Galium Claytoni Michx. 
