CATALOG OF PLANTS. 75 



47. Typha angustifolia L. XarroAv-leaved cat-tail. — In very wet 



places along- the lake .shore near Bayport. 



48. Sparganium eurycarpum Engelm. Broad-fruited bur-reed. — 



Abundant in very wet places throughout the sand region. 



49. Potamogeton natans L. Common floating pondweed. — 



Noticed in Rush Lake, in coves near Caseville. Port Austin, 

 and Sebewaing. 



50. Potamogeton heterophyllus Schreb. Various-leaved pondweed. 



— In Rush Lake and at Sand Point near fishing dock. ''East 

 of Port Austin." Davis. 



51. Potamogeton heterophyllus longipedunculatus (Merat) Morong. 



Various-leaved pondweed.— "In water nearly four feet deep 

 off the beach of Point of Pines Hotel. Port Austin. The 

 root stocks of the plants grow in the crevices in the rocks, 

 and the plants thrive in spite of the violent surf which fre- 

 ciuently breaks on the shore." Davis. 



52. Potamogeton angustifolius Berchtold & Presl. Ziz's pondweed. 



— In Rush Lake. 



53. Potamogeton richardsonii (Benn.) Rydb. Clasping-leaved pond- 



weed. — Near fish dock, 8ton\' Island. 



54. Potamogeton perfoliatus L. Clasping-leaved pondweed. — Near 



fish docks at Sand Point and on Stony Island. 



55. Potamogeton foliosus niagarensis (Tucherm.) ^Morong. Leafy 



pondweed. — Noticed in Pigeon River at Caseville. "Pinne- 

 bog RiA'er." Davis. 



56. Potamogeton filiformis Pers. Filiform pondweed. — "Shallow 



water less than one foot deep on beach between Port Austin 

 and Port Crescent. Also at North Charity Island in water 

 six inches deep. Abundant at both locaUties." Davis. 



57. Potamogeton pectinatus L. Fennel-leaved pondweed. — In 



shallow water on margin of the lake and near the fishery 

 dock on Stony Island. "Pigeon River, Caseville." Davis. 



58. Najas flexilis (Willd.) Rostk. and Schmidt. Slender naiad. — 



Al)un(lant in Rush Lake. 



59. Triglochin maritima L. Seaside arrow-grass. — Frecjuent in bogs 



and marshes at Sand Point, Bayport, Sebewaing and on 

 North Island. 



60. Triglochin palustris L. ^larsh arrow-grass. — Frecjuent on damp 



sand along Lake Huron shore. 



61. Sagittaria latifolia "Willd. Broad-leaved arrow-head. — Common 



on mud and in shallow water throughout the sand region. 



62. Alisma plantago-aquatica L. Water plantain. — Yery comuKMi 



on mud and in shallow water. 



