IOWA ACADEMY OF SCIENCES. 215 



Amianthium Angustifolium, Gray. Myers. Ponds and 

 depressions in tiatwoods. 



PoNTEDERA CoRDATA, L. Myers (354). Ponds and swamps. 



EicHORNiA Crassipes, Solms. Myers (804). Abundant in 

 Caloosahatchee river and tributary streams. Water 

 hyacinth. 



Xyris Brevifolia, Michx. Myers. 



Xyris Elata, Chapm. Marco. 



Xyris Ambigua, Beyr. Marco, Alva, Myers (360). Plat- 

 wood ponds. Flowers yellow. 



Xyris Platylepis, Chapm. Myers (359). Ditches and 

 swamps. Grows in bunches, Flowers yellow. 



Xyris Torta, Smith. Myers (358). Flatwoods. Flowers 

 white, l^lants solitary. 



Xyris Baldwiniana, R. & S. Myers (357). Wet-weather 

 ponds in tiatwoods. (jrrows in clumps. Flowers yel- 

 low. 



CoMMELYNA NuDiFLORA, L. Myci's (3()4). Aloug rivcr bank. 



Commelyna Ereota, L Myers (363', Punta Rassa. A 

 weed in tields. Forms large bunches. 



Tradescantia Floridana, Wats. Myers (361). On little 

 hillocks in hammock, forming a mat over the ground. 



Tradescantia Rosea, Vent. Myers (362), Marco. Flat- 

 woods. 



JuNcus Effusus, L. Marco. 



JuNcus SciRPOiDEs, Ijam. Myers (367 . Flatwood ponds 



JuNcus Elliottii, Chapm. Alva (365). Flatwoods. 



JuNcus Marginatus, Rostk. Myers (366). Flatwood ponds. 



Sagittaria Lancifolia, L. var. Falcata, Smith. Myers. 



Ponds. 



Sagittaria Graminea, Michx. Myers. 



Var. Cycloptera, Smith. Myers (371.) Flatwood ponds, 

 in the water or along the margin. 



Sagittaria Subulata, Buch. var. Xatans, Smith. Myers 

 (370). Permanent ponds. Leaves and fruit sub- 

 merged. Flowers at surface. When the flowers are 

 drawn beneath the surface a bubble of air remains 

 inside the petals and the polen is not injured. 



Triglochin Triandra, Michx. Myers (372.) Salt marshes. 



