SUPPLEMENT. 

FERNS AND FERN-ALLIES, 

By JOHN E. SOWERBY. 
Orper CVII. EQUISETACEA. 
Genus 1. Equisetum. 
E. ARVENSE. Field Horse-tail. Fig. 1701. 
Fertile stems unbranched ; sheaths distant, loose. Sterile stems with 
12-14 strice, Moist pastures. 6in.to2ft. Perenn. March. £. B.1. 
2020. #.B. 2.1461. H. & drn. 598. Bab. 4.414,5.415. N.77. 8.1. 
EK. umsprosum. Blunt-topped Horse-tail. Fig. 1702. 
Fertile stems unbranched, sheaths appressed. Sterile stems with 
about 20 strize. Moist woods. 2ft. Perenn. March. #. B.S. 2777. 
EL. B.2.1460. H.&§& Arn. 597. Bab. 4.415, 5.415. N.63. 8.2. 
E. Tetmateta. Great Horse-tail. Fig. 1703. 
Sterile stems nearly smooth, with about 30 striz. Marshes and 
bogs. 3-6 ft. high. Perenn. March. #. B. 1.2022. H. B. 2.1459. 
H.& Arn.597. Bab. 4.415, 5.416. N.67. 8.3. 
E. sytvaticum. Wood Horse-tail. Fig, 1704. 
Stems with about 12 strie. Moist woods. 12-18in. April, May. 
E. B.1.1874. E.B.2.1462. H.& Arn. 598. Bab. 4.415, 5.416. 
N.59. 8.4. 
E. timosum. Smooth Horse-tail. Fig. 1705. 
Stems nearly smooth, with numerous slight strize. Ponds and ditches. 
2-4 ft. Perenn. July. #.B.1.929. 2. B.2. 1463. H. & Arn. 
598. Bab. 4.415,5.416. N.51. 8.5. 
E. patustre. Marsh Horse-tail. Fig. 1706. 
Stems rough, with 6 or 8 broad prominent strie. Watery places. 
6-18in. Perenn. July. #.B.1.2021. H.B.2.1464. H.& Arn, 
598. Bab.4.416, 5.416. N.43. 8.6. 
E. ayemate. Rough Horse-tail. Fig. 1707. 
Stems simple, very rough, with 14-20 strie. Damp woods. 2-3 ft. 
Aug. E.B.1.915. E.B.2. 1465. H.& Arn, 599. Bad. 4. 416, 
5.417, N.17. 8.8. ee 
E. Moorer. Moore’s Equisetum. ig. . 
Stem simple, rough, with 10-14 striee. Rockfield, Wicklow. 1-3 ft. 
Ann. Aug. Bab. 4.416, 5.417. 8.12. 
E. Macxan. Mackay’s Equisetum. Fig. 1709. 
Stem erect, simple, very rough, with 8-12 striz. Sheaths close, ulti- 
mately wholly black. Mountain glens. 1-4 ft. Perenn. Aug. 
H.§ Arn.599. Bab.4.416,5.417. WN. 24. 8. 9. 
E. variscatum. Variegated Rough Horse-tail. Fig. 1710. 
Stems decumbent, with 4-10 strie. Sandy sea-shores. 1-8 m. 
Perenn. Aug. E.B.1.1987. #. B.2. 1466. H. & Arn. 599. Bab. 4. 
416,5.417. N31. S. il. 2h 
