BOTANICAL SURVEY— SUGAR GROVE REGION 



293 



2. Shade-loving herbs with hibernating leaves replaced in spring 



by new ones : 



Hepatica acutiloha Hepatica hcpatica 



Carex plantaginea Dryopteris spinulosum 



Dryopteris marginalis UnifoUum canadense 



Tiarella cordifolia 





Fig. 26. The Walking Fern (Camptosorus rhizophyllus). 



3. Evergreen herbs with leaves or shoots ascending sufficiently 

 from the ground partially to surmount a blanket of fallen leaves : 

 Mitchella repens Ganltheria procumbens 



Lycopodium lucidulum Lycopodium complanatum var. 



■flabelliforme 



THE UPLAND THICKETS. 



The Sumac Thicket. There are many steep slopes in the area 

 where the rock comes so close to the surface ms to prevent the growth 

 of trees, but yet is not jji-ccipitous and retains a thin covering of soil. 

 Here a thicket develops which is dominated by Rhus cop.m.t.txa and 

 Andropogon scoparh-s. Avith the roHowing secondary species: 

 Mains glaucescens Spccitlaria pcrfoliata 



Rubus procumhrna (Dewberry) Meibomia caiieseens 



Smilax gJauca roloiliJht cmadensh 



Eubus alleghieiifiis (Highbush P.. B.) 



This association origiiudly occupied n very sni;dl amount of terri- 

 torv in this area, bnl sinct" llic hiiul lias hrcii cli'arrd and ciillivalrd a 



