658 Harshberger: Plant formations of Nockamixon Rocks 



naria canadensis, Aqiiilegia canadensis {p\\ the talus and on rocks), 

 Geranium Rohertianuni^ Viola canadensis, Cimicifnga racemosa. 



Secondary herbs : Trillium erectnm, T. cermnim, Thaiictnun 

 pnrpnrascens^ T. dioicnm, T. polygamum, Hydropliylhun canadense, 

 H, virginicum^ Eupatorium ageratoides {E. urticaefoliuni), Parietaria 

 pennsylvanica, Aralia racemosa, A. trifolia, Osmorrhiza brcvistylis, 

 Zizia cordata, Tkaspiitm aiireuni, Cryptotaenia ca)iadcnsis^ Viola 

 striata^ V. blanda, V cucidlata, V. palmata^ Galium Aparine^ 

 G. triflorum, Helianthus decapetaliis, Aster cordifolius^ Cerastium 



aniens c var. oblongifolinm^ Ac la e a aid a. . 



WiNTERGREEN SPECIES: On October 23, 1908, the writer ob- 

 served the following species of the talus slopes which are the most 

 important elements of the wintergreen flora : Taxus canadensis^ 

 Asarum canadcnse. Geranium Robertianumiya flower), Carex platy- 

 phylla, Saxifraga pemisylvanica, Dryopteris marginalis, Polysticlmm 

 acrostichoides, Polypodium vulgare, Tsuga canadensis, and Rhodo- 

 dendron maximum, which the writer has shown elsewhere takes 



+ 



advantage of every mild, sunny day during the winter to manu- 

 facture starch and other organic products. 



Talus and cliff rock mosses: The mosses and hepatics 

 that grow on the talus and cliff rocks are : (Hepaticae), ConocepJi- 

 alum conicum, Marchantia polymorpha, Pellia eplphylla, Geocalyx 

 graveolens, Lophocolea heterophylla, Plagiochila asplenioides, Porella 

 platyphylla, Scapania nemorosa; and (Musci) Catharinea angiistafa, 

 C. undulata^ Pogonatum brevieaide, Polytrichnm commune^ Web era 

 sessilis, Fissidens osvmndioides, F. bryoides (wet and damp places), 

 Ceratodon purpureus^ Dicranella heteromalla, D, h. Fitzgeraldi, D. 

 scoparium, Ditrichum tortile, D. pallidum, Leucobryum glaucum^ 

 Weisia viridida, Funaria hygrometrica, Aulacomnium heterostichuniy 

 Bartramia pomiformis, Bryuin argenteum, B. caespiticium^ B. 

 roseum, Mniutn a fine, M, pimctatum, M. rostratiim, M. sylvaticum, 

 Anomodon apicidatus, A. rostratus. A, attenuatus, Thiddiiim deli- 

 catidum, Cirriphyllum Boscii, Hylocomium proliferuift, H. tri- 

 quetrum, Climacium americanum, and G dendroides. 



The following list of additional plants arranged by families was 

 furnished me by Dr. S. P. Seese, of Lansdale, Pennsylvania. 

 All of them grow on the talus slopes of the Nockamixon Rocks. 



