Marshall—The Vegetation of Twin Island. 793 
Trillium cernuum L., Nodding wake-robin (?), c. 
Pontederia cordata L., Pickerel-weed, w. 
Calycinales 
Juncus dichotomus Ell., Forked rusk, c. 
Glumales 
Scirpus fluviatilis (Torr.) A. Gray, River bulrush, w. 
Scirpus lacustris L., Great bulrush, s; w. 
Eriophorum polystachyon L., Tall cotton-grass, s. 
Cyperus strigosus L., Straw-colored cyperus, s. 
Car ex hystricina Muhl., Porcupine sedge, s. 
Carex tuckermanni Dewey, Tuckerman’s sedge, b. s. 
Carex goodenovii J. Gay, Goodenough’s sedge, b. s. 
Carex alata Ton., Rough-winged sedge, s; b. s. 
Carex leporina L., Hare’s-foot sedge, b. s. 
Carex scoparia Schk., Pointed broom sedge, s. 
Bromus ciliatus L., Fringed brome-grass, c. 
Festuca ovina L., Sheep’s fescus-grass, c. 
Agropvron tenerum Hook., Slender wheat-grass, c. 
Spartina cynosuroides (L.) Willd., Tall marsh-grass, b. s; s. 
Calamagrostis canadensis (Michx.) Beauv., Blue joint- 
grass, b. s.; s. 
Agrostis alba L., Red top, c; b. s. 
Phleum pratense L., Timothy, b. s. 
Muhlenbergia tenuiflora (Willd.) B. S. P., Slender muhlen- 
bergia, b. s.; s. 
Muhlenbergia racemosa (Michx.) B. S. P., Marsh muhlen¬ 
bergia, c. 
Homalocenchrus lenticularis Michx., Catch-fly grass, s. 
Panicum capillare, Witch-grass, s. 
Panicum filiculme Ashe, c. 
Panicum crus-galli L., s. 
Iridales 
Iris sp. c. 
Ranales 
Nymphaea advena Soland., Large yellow pond lily, w. 
Aquilegia canadensis L., Wild Columbine, c. 
Anemone quinquefolia L., Wind-flower (?), c. 
Thalictrum polygamum Muhl., Tall meadow-rue, b. s.; c. 
