22 GENERAL INTRODUCTION. 



The more common undershrubs (some of them growing to be 

 small trees) are : Acer Pennsylvaniciiin. A. spicatinn, Priiniis pumila, 

 P. Peiuisylvaiiica, P. Virginiana, SpircEa sal ici folia, S. tomentosa, 

 Rtibus odorahis, R. trifloriis, R. strigosiis. R. occidentalis, R. villosiis, 

 R. Canadensis, Rosa Carolina, Cratergiis coccinca, C. tonientosa, C 

 crns-galli, Pyriis sambncifolia, Amelanchier Canadensis, A. Canaden- 

 sis botryapinm, A. Canadensis oblongifoli a, Ribes lacustre, R. rnbrtmi, 

 Hamamelis Virginica, Cornus circinata, C. siolonifera, C paniculata, 

 C alternifolia, Lonicera ciliata, Diervilla trifida, Sambtccns pnbens, 

 S. Canadensis, Vibtirmun lentago, V. acerifoli2nn, V. opiihis, V. lan- 

 tajioides, Cephalanthns occidentalis, Gaylussacia resinosa, Vaccininni 

 Pennsylvaniciim, V. corynibosnm, Arctostaphylos ttva-nrsi, Cassandra 

 calyculata, Andromeda polifolia, Kalmia angusiifolia, K. glanca, Aza- 

 lia nudiflora, RJiodora Canadensis, Ledum lalifolium, Apocynum- 

 androscemifolium. Ilex Icevigata, Corylns rostrata, Carpinus Ameri- 

 cana, Myrica gale, Alnus viridis, A. incana, Salix (several species), 

 and Tax7is baccata Canadensis. 



Of the smaller flowering plants the following are among the most 

 noticeable: Clematis Virginiana, Anemone Pennsylvanica, A. nemorosa, 

 Hepatica triloba, Thalictrnm dioiciim, Rannncnlus fiammula reptans, 

 R. abortiviis, R. rccitrvatiis, Caltha pabtstris, Coptis trifolia, Aquilegia 

 Canadensis, Act<^a spicata nibra, A. alba, Caidophylhtm thalictroides, 

 NymphcBa odorata, Nnphar advena, Sarraccnia purpurea, Sanguinaria 

 Canadensis, Dicentra ciuidlaria, D. Canadensis, Dcntaria diphylla, 

 D. laciniata, Arab is lyrata, Viola rotnndifolia, V. blanda, V. Sel- 

 kcrki, V. ciicidlata, V. canina sylvestris, V. rostrata, V. Canadensis, 

 V. ptibescens, Drosera rotnndifolia, D. longifolia, Helianthejninn Cana- 

 dense, Hypericum pyramidatum, H. ellipticum, H. perforatum, Blades 

 Virginica, Silene iifiata, Arenaria Grcenlandica, A. lateriflora, Clay- 

 tonia Carolinia7ia, Gera^iium Robertianum, Impatiens pallida, Oxalis 

 acetosella, Ampelopsis quinquefolia, Celastrus scandens, Polygala pauci- 

 folia, Poteriiim Canadense, Geum macrophyllum, Waldsteinia fraga- 

 rioides, Potentilla Norvegica, P. Canadensis, I^. tridcntata, P.palustris, 



