320 PLANT LIFE OF ALABAMA. 
MANCHURIA, JAPAN, WEsT INpIEs (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 llorida, along 
the Gulf coast to Louisiana and Texas; Arkansas, Missouri, 
ALABAMA: Low, swampy, open woods and thickets everywhere. Mobile County. 
April. 
Type locality: “Hab. in Marilandia.”’ 
Herb. Geol. Surv. Herb. Mohr, 
Osmunda regalis L. Sp. Pl. 2: 1065. 1753. Roya. FERN, 
Gray, Man. ed. 6, 693. Chap. F1. 598. Eaton, Ferns N. A. 1:209, t. 28. Coulter, 
Contr. Nat. Herb, 2 568. Underwood, Native Ferns, 124. 
UROPE, 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. Eneyel. 1:348. 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, Contr. 
Nat. Herb, 2:559. Underwood, Native Ferns, 128. 
Alleghenian to Louisianian area. Lake Ontario to British Columbia, southern 
New York, west to Ohio, southern Tlinois, 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 Carolinae.” 
Herb, Geol. Surv. Herb. Mohr. 
Order EQUISETALES. Horsetails. 
EQUISETACEAE. Horsetail family. 
EQUISETUM L.. Sp. P1.2:1061. 1753. 
About 25 species, chiefly of cooler temperate zones. North America, 13. 
Equisetum laevigatum A. Br.; Engelm. Am, Journ. Sei. 46:87. 1X44. 
SMOOTH HORSETAIL, 
Gray, Man. ed.6,677. Chap. F1.585. Milde, Act. Acad. Caes. Leop. 32, pt. 2: 546, 
1.32, Wats. Bot. Calif. 2:331. Coulter, Contr. Nat. Herb. 21559, 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, Seottsville (A. A. Smith). August. 
Rare. 
Type locality: ‘‘Hab. on poor clayey soil, with Andropogon and other coarse 
grasses, at the foot of the rocky Mississippi hills, on the banks of the river below 
St. Louis.” (N. Riehl, 1840.) 
Herb. Geol. Surv. 
Equisetum robustum A. Br,; Engelm. Am, Journ. Sci. 46:88, 1844. 
STour IHORSETAIL, 
Gray, Man. ed. 6,677. Chap. Fl. Suppl. 669. Wats. Bot. Calif. 2-330. Milde, Act. 
Acad. Caes. Leop, 32, pt.2:532, t.97. Underwood, Native Ferns, 135. 
Mexico, British CoLtumMBIA, CALIFORNIA, Kas? INDIES. 
Carolinian to Louisianian area, Ohio, Illinois, southern Missouri, Louisiana, and 
New Mexico, 
