195] FLORA OF COLUMBIA AND VICINITY 53 



haws (Viburnum prunifolimn and V. rufotomentosum) . Lianas 

 are very frequent, consisting especially of Smilax hispida and 

 6". rotundifolia, Vitis riparia, Menispermum Canadense, Rhus 

 Toxicodendron, and Quinaria quinquefolia. The herbs are not 

 at all characteristic, being of the usual lowland types. The fol- 

 lowing list comprises the species of haws which occur in these 

 glades : 



Mespilus Crus-galli M. macracantha 



M. punctata M. mollis 



M. cordata M. Biltmoreana 



M. Eggerti M. campestris 



M. viridis M. tomentosa 



M. nitida M. Chapmanii 



M. coccinea M. dispessa 



M. rotundifolia 



E. Sentae. The flora of bramble and brier thickets. 

 a. Sentae ruboides. The bramble association of 



mostly prickly undershrubs, often with recurved branches, or 

 even climbing or trailing, is found usually in patches in wild 

 fields or in open thickets. It is composed mainly of armed rosa- 

 ceous shrubs, but similar patches consisting wholly of the buck- 

 bush {Syinphoricarpos vulgaris) or with some admixture of 

 brambles and gooseberries (Ribes spp.), are very common. 

 There are no characteristic herbs. The following are the chief 

 species : 



Ribes gracile Rosa setigera 



R. Missouriense R. Woodsii 



Rubus occidentalis R. humilis 



R. nigrobaccus Hypericum prolificuni 



R. procumbens Symphoricarpos vulgaris 



