177] 



FLORA OF COLUMBIA AND VICINITY 



35 



c. Alluviales violoides. The violet association of ver- 

 nal alluvial herbs consists chiefly of Violaceae, Ranunculi eae, 

 Papaveraceae, Liliaceae, and Umbelliferae. The plants are low 

 for the most part and consist of species inhabiting rich hillsides, 

 and deep ravines. The following is a partial list: 



Arisaema atrorubens 

 A. Dracontium 

 Erythronium albidum 

 Claytonia Virginica 

 Cerastium brachypodum 



C. nutans 



Isopyrum biternatum 

 Ranunculus abortivus 

 R. septentrionalis 

 Thalictrum purpurascens 

 Leontice thalictroides 

 Dicentra Canadensis (rare) 



D. Cucullaria 

 Corydalis montana 

 Dentaria laciniata 



d. Alluviales hydrophylloides. The waterleaf associ- 

 ation of early summer alluvial herbs occurs in dense masses. 

 The chief plants are : 



Geum vernum 



Viola papilionacea 



V. cucullata 



V. striata 



V. scabriuscula 



Chaerophyllum pro- 



cumbens 

 Osmorrhiza brevistylis 

 O. longistylis 

 Erigenia bulbosa 

 Phlox divaricata 

 Polemonium reptans 

 Mertensia Virginica 

 Collinsia verna 



Commelina nudiflora 

 Tradescantia reflexa 

 T. pilosa 



Hybanthus concolor 

 Hydrophyllum append- 



iculatum 

 H. Virginicum 



e. Alluviales impatientoides. The touch-me-not asso- 

 ciation of summer and autumn herbs is found chiefly about the 



Ellisia Nyctelea 

 Phacelia Purshii 

 Scutellaria versicolor 

 Blephilia hirsuta 

 Galium Aparine 

 Erigeron Philadelphicus 



