328 PLANT LIFE OF ALABAMA. 



ALABAMA: Coast plain. Shallow pond near the western shore of Mobile Bay 

 shell road, 1885. Locality since obliterated (C. Zimmer). A waif from higher 

 latitudes. 



Type locality not ascertained. 



Herb. Geol. Surv. Herb. Mohr. 



Potamogeton perfoliatus L. Sp. PI. 1 : 126. 1753. 



Gray, Man. ed. 6, 562. Chap. Fl. 446. Morong, Mem. Torr. Club, 3 : 33, t. 40. 



EUROPE, GUATEMALA, NICARAGUA. 



Canadian zone, Alleghenian to Louisianian area. Nova Scotia, New Brunswick, 

 Quebec, Ontario, New England, west to Michigan and Minnesota, south to New Jer- 

 sey, western Tennessee, Florida ( !), and Texas. 



ALABAMA: Coast plain. Gently flowing water. Mobile River delta. Dog River. 

 Abundant in this locality. 



Type locality : "Hab. in Europae lacubus fluviisque argillosis." 



Herb. Geol. Surv. Herb. Mohr. 



Potamogeton crispus L. Sp. PI. 1 : 126. 1753. 



Gray, Man. ed. 6, 562. Moroug, Mem. Torr. Club, 3 : 36, t. U. 



TEMPERATE EUROPE. 



Alleghenian to Louisianian area. New England to New Jersey, Virginia, and 

 western Florida. 



ALABAMA : Coast plain. Gently flowing water. Mobile County, estuaries of Mobile 

 and Dog rivers. Flowers and matures fruit in July. 



Type locality: " Hab. in Europae fossis et rivulis." 



Herb. Geol. Surv. Herb. Mohr. 



Potamogeton pusillus L. Sp. PI. 1 : 127. 1753. 



Gray, Man. ed. 6, 563. Wats. Bot. Calif. 2 : 128. Morong, Mem. Torr. Club, 3 : 45, 

 t.53. 



EUROPE. 



Alleghenian to Louisianiaii area. New Brunswick and Ontario to Saskatchewan ; 

 New England (Mount Desert Island) west to Michigan, Missouri, Colorado, and 

 California; New Jersey to Florida, west to Texas. 



ALABAMA: Coast plain. The form with filiform stem, setaceous, cuspidate leaves 

 (P. tenuissimus auct.), estuary Mobile River. Flowers in May. Infrequent. 



Type locality : " Hab. in Europae paludibus." 



Herb. Geol. Surv. Herb. Mohr. 



Potamogeton diversifolius Raf. Med. Rep. ser. 2, 5 : 354. 1808. 



Potamogeton hybridus Michx. Fl. Bor. Am. 1 : 100. 1803. Not Thuill. 



Ell. Sk. 1 : 222. Gray, Man. ed. 6, 560. Chap. Fl. 446. Coulter, Contr. Nat. Herb. 

 2 : 456. Morong, Mem. Torr. Club, 3 : 48, t. 55. 



Alleghenian to Louisianian area. New England (Mount Desert Island) west to 

 Michigan, Nebraska, and Missouri, south to New Jersey, Florida, and the Gulf States, 

 extending to western Texas and New Mexico. 



ALABAMA: Central Prairie region to Coast plain. Frequent in pine-barren streams 

 and shallow ponds. Mobile, Baldwin, and Montgomery counties. Flowers in June 

 with mature fruit. 



Type locality of P. hybridus: " Hab. in aquis stagnantibus Carolinae." 



Herb, Geol, Surv. Herb. Mohr. 



RUPPIA L. Sp. PI. 1 : 127. 1753. DITCHGRASS. 



Two or 3 species, aquatics, cosmopolitan outside of the Arctic zone. North 

 America, 2 species. 



Ruppia maritima L. Sp. PI. 1 : 127. 1753. 



Ell. Sk. 1 : 581. Gray, Man. ed. 6, 564. Chap. Fl. 445. Griseb. Fl. Brit, W. Ind. 506. 

 Wats. Bot. Calif. 2 : 193. Coulter, Contr. Nat. Herb. 2 : 457. Morong, Mem. Torr. 

 Club, 3:55, t. 62. 



EUROPE, WEST INDIES. 



Canadian zone to Louisianiaii area. Along the seacoast. Nova Scotia, New 

 Brunswick, New England (Mount Desert Island), south to Florida and Texas; 

 Pacific coast. 



ALABAMA: Littoral belt. In brackish or saline pools, ditches. Mobile County, 

 Mobile Bay; abundant. Flowers and mature fruit in June. Annual. ? 



Type locality : " Hab. in Europae maritimis." 



Herb. Geol. Surv. Herb. Mohr. 



