1903] Blankinship,— Plant-formations of E. Massachusetts 13 3 
gb. Boc Formation.  ZeopAytes. 
Habitat: similar to the preceding but characterized by the abun- 
dance of Sphagnum species, which form a close mat over the surface 
and maintain. more equable conditions of temperature and moisture 
and thus permit the southern extension of many northern species. 
Flora very distinct from the preceding, with many Ericaceous shrubs. 
? Vaccinium macrocarpon, Ait. 
? V. Oxycoccus, L. 
? Cassandra caliculata, Don. 
° Andromeda polifolia, L. 
° Kalmia glauca, Ait. 
? Ledum latifolium, Ait. 
° Rhododendron Rhodora, Don. 
Sarracenta purpurea, L. 
Chiogenes serpyllifolia, Salisb. 
Smilacina trifolia, Desf. 
Rhynchospora alba, Vahl. 
Epilobium lineare, Muhl. 
Menyanthes trifoliata, L. 
Sphagnum spp. 
10. SALT-MARSH FORMATION. 
Eriophorum gracile, Koch. 
E. vaginatum, L. 
Arethusa bulbosa, L. 
Cladium mariscotdes, Torr. 
Drosera rotundifolia, L. 
D. intermedia Americana, DC. 
Utricularia cornuta, Michx. 
Clintonia borealis, Raf. 
Calla palustris, L. 
Geum rivale, L. 
Calopogon pulchellus, R. Br. 
Pogonia ophioglossoides, Nutt. 
Habenaria lacera, R. Br. 
Haloheloph ytes. 
Habitat: mud, flats covered by the sea at extreme tides and sup- 
porting a short but dense vegetation; frequent along the coast. 
Brackish meadows have a mixture of this flora and that of (ga). 
No shrubs. 
Gerardia maritima, Raf. 
Salicornia herbacea, L. 
Suaeda linearis, Moq. 
Juncus Gerardi, Loisel. 
Spartina juncea, Willd. 
S. stricta glabra, Gray. 
Distichlis maritima, Raf. 
Triglochin maritima, L. 
Puccinellia maritima, Parl. 
Atriplex patulum hastatum, Gray. 
Jva frutescens, L. 
Pluchea camphorata, DC. 
ri. BoGGy-WoopLAND FORMATION. 
Solidago sempervirens, L. 
Carex maritima, O. F. Mueller. 
Statice Limonium Caroliniana, Gray. 
Aster subulatus, Michx. 
Potentilla Anserina, L. 
Scirpus maritimus, L. 
Buda maritima, L. 
Scirpus pungens, Vahl. 
Iris prismatica, Pursh. 
Typha angustifolia, L. 
Aster tenuifolius, L. 
Helophytes. 
Habitat: low wet woodlands, swampy or boggy with a dense 
Sphagnum growth; much humus and substratum unimportant. 
