Maritime Distriet: New England. 
Iris versicolor L. 
Carex stricta Lam. 
Zizania aquatica L. 
Glyceria fluitans R.Br. 
Ludwigia (Isnardia) palustris L. 
Proserpinaca palustris L. 
Cicuta maculata L. 
>»  bulbifera L. 
Sium cicutaefolium Gmel. 
387 
Lathyrus palustris L. 
Decodon (Nesaea) verticillatus EIl. 
Veronica scutellata L 
Bidens chrysanthemoides Michx. 
(= B. laevis L.). 
Caltha palustris L. 
Cardamine pennsylvanica Muhl. 
Rumex britannica L 
Equisetum limosum L. 
Mud Pond Formation. This formation exists in ponds and slow-flowing 
streams with mucky, clay bottom. The plants of the table have their upper 
leaves floating, rarely submerged. 
Chara fragilis Desv. 
Nitella flexilis Ag. 
Marsilia quadrifolia L. 
Podostemon ceratophyllum Michx. 
Naias flexilis R. & S. 
Potamogeton crispus L. 
sr natans. L. 
Elodea (Philotria) canadensis Michx. 
| Vallisneria spiralis L. 
| Ranunculus multifidus Pursh 
(= R. delphinifolius Torr.). 
Myriophyllum spicatum L. 
Callitriche heterophylla Pursh. 
Nuphar (Nymphaea) advena Ait. 
Nymphaea (Castalia) odorata Ait. 
This formation also includes the free floating vegetation of fresh water 
ponds, streams and ditches including 
Utricularia vulgaris L. 
» purpurea Walt. 
» inflata Walt. 
Riccia fluitans L. 
Lemna minor L. 
». trisulca L. 
Spirodela polyrhiza Schleid. 
Riccia natans 
| 
) 
| 
Sand Pond Formation. BLANKINSHIP thinks this formation distinct enough 
from the preceding to merit separate treatment. 
The bottoms of the ponds 
where the vegetation of this formation occur, are sandy with little humus. 
The plants named below are usually submersed with their upper leaves floating: 
Myriophyllum tenellum Bigel. 
» ambiguum Nutt. (= M. 
humile Raf.). 
Naiasindica var. gracillima A.Br. (=N. 
gracillima A.Br.). 
Hottonia inflata EI. 
Eriocaulon septangulare With. 
Proserpinaca pectinata Lam. 
Limnanthemum lacunosum Griseb. 
 Potamogeton spirillus Tuckerm. 
Sagittaria teres Wats. 
Orontium aquaticum L. 
Lobelia Dortmanna L. [Michx.). 
Brasenia peltata Pursh (= B. purpurea 
Nuphar Kalmianum Sims. 
Nymphaea odorata Ait. 
Lycopodium inundatum L. var. Bige- 
| lovii Tuckerm. 
The margin of such sand ponds is fringed by a number of characteristic 
herbs that will grow in wet, open sandy places. Several of the plants mentioned 
25* 
