PLANTS OF IOWA 219 



VIBURNUM, L. 



2843. V. opulus, L. Cranberry-tree. 

 Not common; on rocky slopes. 



2844. V. pubescens, (Ait.) Pursh. Downy-leaved Arrow- 



wood. 

 On rocky slopes ; not common. 



2845. V. dentatum, L. Arrow-wood. 

 On moist banks; not common. 



2846. V. lent ago, L. Sheep-berry. 



Common in alluvial soils, and on lower slopes. 



2847. V. prunifolium, L. Black Haw. 

 In dry soil. 



TRIOSTREUM, L. 



2848. T. perfoliatum, L. Horse-gentian. 

 Frequent in woods. 



2849. T. aurantiacum, Bicknell. Red-fruited Horse-gentian, 

 Common in upland woods. 



2850. T. angustifolium, L. Yellow Horse-gentian. 



LlNN^EA, L. 



2851. L. americanus, Forbes. Twin-flower. 

 In upland woods, not common. 



2852. L. boralis, L. Gi$8id Vine. 

 Introduced from Europe, infrequent. 



SYMPHORICARPOS, Juss. 



2853. S. racemosus, Michx. Snowberry. 

 Not common; on rocky slopes. 



2854. 8. occidentalis, Hook. Wolfberry. 

 Common in dry places. 



,2855. 8. symphoricarpos, (L.) MacM. Coral-berry. 



In rocky places; not infrequent. 

 LONICERA, L. 



2856. L. glaucescens, Rydb. Douglas' Honeysuckle. 

 Woods, infrequent. 



2857. L. dioica, L. Glaucous Honeysuckle. 

 Common, on rocky slopes and banks. 



2858. L. sullivantii, A. Gray. Sullivan's Honeysuckle. 

 On wooded slopes and along borders. Not rare. 



