320 PLANT LIFE OF ALABAMA. 



MANCHURIA, JAPAN, WEST INDIES (BERMUDA, CUBA), MEXICO TO BRAZIL. 



Canadian zone to Louisianian area. Nova Scotia, Quebec, Lake Superior, Ontario, 

 New England (Mount Desert Island) ; all over the Atlantic States to Florida, along 

 the Gulf coast to Louisiana and Texas; Arkansas, Missouri. 



ALABAMA: Low, swauipy, open woods and thickets every where. Mobile County. 

 April. 



Type locality: "Hab. in Marilandia." 



Herb. Geol. Surv. Herb. Mohr. 



Osmuuda regalis L. Sp. PI. 2 : 1065. 1753. ROYAL FERN. 



Gray, Man. ed. 6, 693. Chap. Fl. 598. Eaton, Ferns N. A. 1:209, /. ;?5. Coulter, 

 Contr. Nat. Herb. 2 568. Underwood, Native Ferns, 124. 



EUROPE, ASIA, AFRICA, CUBA, MEXICO TO BRAZIL. 



Canadian zone to Louisianian area. Newfoundland, Nova Scotia, Ontario to Sas- 

 katchewan; from Lake Superior to Florida and the Gulf coast, west to Texas, 

 Arkansas, Missouri. 



ALABAMA: Swampy borders of woods, open marshes. Common throughout the 

 State. August, September. 



Type locality: "Hab. in Europa, Virginia ad fluvios." 



Herb. Geol. Surv. Herb. Mohr. 



SALVINIACEAE. Water Fern Family. 

 AZOLLA Lam. Encycl. 1 : 343. 1783. 



Four species, temperate regions, 1 North American. 

 Azolla caroliniana Willd. Sp. PL 5 : 541. 1810. 



Gray, Man. ed. 6, 701. Chap. Fl. 602. Wats. Bot. Calif. 2 : 352. Coulter, Coutr. 

 Nat. Herb. 2 : 559. Underwood, Native Ferns, 128. 



Allegheuian to Louisianian area. Lake Ontario to British Columbia, southern 

 New York, west to Ohio, southern Illinois, southern Missouri, Arkansas, Arizona, 

 and California, south to Florida and Texas. 



ALABAMA: Coast plain, floating in still water. Mobile County, abundant in pools 

 and ditches. 



Type locality : " Hab. in aquis Caroliuae." 



Herb. Geol. Surv. Herb. Mohr. 



Order EQUISETALES. Horsetails. 

 EQUISETACEAE. Horsetail family. 



BQTJISETUM L. Sp. PI. 2 : 1061. 1753. 



About 25 species, chiefly of cooler temperate zones. North America, 13. 



Equisetum laevigatum A. Br. ; Engelm. Am. Journ. Sci. 46 : 87. 1844. 



SMOOTH HORSETAIL. 



Gray, Man. ed. 6, 677. Chap. Fl. 585. Milde, Act. Acad. Caes. Leop. 32, pt. 2 : 546, 

 t.32. Wats. Bot. Calif. 2:331. Coulter, Contr. Nat, Herb. 2:559. Underwood, 

 Native Ferns, 135. 



Carolinian and Louisianian areas. North Carolina, Florida, Louisiana, Texas, 

 Missouri, Colorado, British Columbia, Oregon, and California. 



ALABAMA: Central Pine belt. Bibb County, Scottsville (E. A. Smith}. August. 

 Rare. 



Type locality: " Hab. on poor clayey soil, with Audropogon and other coarse 

 grasses, at the foot of the rocky Mississippi hills, on the banks of the river below 

 St. Louis." (N.Itiekl, 1840.) 



Herb. Geol. Surv. 



Equisetum robustum A. Br. ; Engelm. Am. Journ. Sci. 46 : 88. 1844. 



STOUT HORSETAIL. 



Gray, Man. ed. 6, 677. Chap. Fl. Suppl. 669. Wats. Bot. Calif. 2:330. Milde, Act. 

 Acad. Caes. Leop. 32, pt. 2 : 532, t. 31. Underwood, Native Ferns, 135. 



MEXICO, BRITISH COLUMBIA, CALIFORNIA, EAST INDIES. 



Carolinian to Louisianian area. Ohio, Illinois, southern Missouri, Louisiana, and 

 New Mexico. 



