78 CATALOG OF PLANTS. 



96. Sporobolus cryptandrus (Torr.) Gray. Sand dropseed. — Fre- 



quent and often abundant in sand on the lake shore and on 

 sand dunes, acting as a sand binder. 



97. Agrostis alba L. Red top.- — Frequent between sand dunes on 



damp prairie-like ground. 



98. Agrostis hyemalis (Walt.) BSP. Hair grass. ^ — In dry ground 



near Port Austin. Not abundant. 



99. Calamovilfa longifolia (Hook). Hack. Long-leaved reed-grass. 



— A very remarkable grass. Often abundant on drifting 

 sand along the lake shore and on the sides of the dune nearest 

 ■ the lake. In Michigan it is probably the best sand binder 

 against the action of strong winds. It usually takes a 

 position on the shore farther away from the water than 

 A mmo phila arenaria . 



100. Calamagrostis canadensis (Michx.) Beauv. Blue-joint grass. — 



Frequent between sand dunes in damp places. 



101. Ammophila arenaria (L.) Link. Sea sand-reed. — Frequent and 



often abundant along the sandy shore of Lake Huron. Prob- 

 ably in Michigan the best shore sand binder against the 

 action of waves. Occasionally mingled with Calamovilfa 

 longifolia, but where the shore is fairly even it takes its place 

 nearer the water than the other grass. This is noticed 

 particularly on the north shore of Sand Point and west of 

 Hat Point. Its root or rootstoek system is remarkable. 



102. Cinna arundinacea L. Wood reed grass. — Occasional in moist 



Avoods and damp shaded places. 



103. Koeleria cristata (L.) Pers. Koeleria. — Frec^uent in sandy 



ground and on sand dunes. 



104. Deschampsia flexuosa (L.) Trin. Common hair grass. — Fre- 



C[uent on shaded sand dunes. Abundant on Sand Point. 



105. Danthonia spicata (L.) Beauv. Common wild oat grass. — 



Frequent throughout on sandy ground and sand dunes. 



106. Spartina michauxiana Hitchc. Slough grass. — Frequent in wet 



marshy ground. 



107. Phragmites communis Trin. Reed. — Occasional in very wet 



))laces, l)ut nowhere abundant in the sand region. 



108. Eragrostis hypnoides (Lam.) BSP. Creeping eragrostis.— 



Occasional on damp sand and in other damp places. 



109. Eragrostis megastachya (Koeler) Link. Strong-scented era- 



grostis — On sandy ground on Stony Island and abundant on 

 sand along the Pinnebog River at Port Crescent. 



110. Melica striata (Michx.) Hitchc. Purple oat. — In rich open 



woods at SeTiewainR-. 



