CL. XXIV.] CRYPTOGAMIA EQUISETACEJE. 395 



the summit of high mountains : common. Eng. Bot. vol. iv. pi. 233. 

 Eng. Fl. vol. iv. p. 333. 1505. 



5. L. annotinum. Interrupted Club-moss. Stems decumbent at the 

 base ; branches ascending, forked ; leaves in five rows, narrow lance- 

 shaped, acute, minutely serrate ; spikes cylindrical, solitary, sessile. 



From six to eight inches high. Perennial : bears fruit in July and 

 August : grows on the mountains of Scotland and Wales. Eng. Bot. 

 vol. xxiv. pi. 1727. Eng. FL vol. iv. p. 334. 1506. 



6. L. alpinum. Savin-leaved Club-moss. Stems prostrate ; branches 

 in tufts, erect, forked, level-topped ; leaves acute, keeled, imbricated 

 in four rows ; spikes terminal, solitary, sessile, cylindrical, their leaves 



broadly lance-shaped, flat. Perennial : bears fruit in August : grows 



on the higher mountains of Scotland, Wales, and the north of England : 

 frequent. Eng. Bot. vol. iv. pi. 234. Eng. FL vol. iv. p. 335. 1507. 



Order HI. EQUISETACEJE. Fructification terminal, spiked, 

 consisting of many peltate, angular, stalked scales, "which, 

 bear at the back from four to seven oblong membranous 

 cells, each containing numerous minute seeds, encompassed 

 by four Ji laments, terminating infourjlat anthers. 



1. EQUISE'TUM. HORSE-TAIL. 



Spike oblong, of many peltate, stalked scales, arranged on a 

 common stalk. Scales angular, bearing at the back from four to 

 seven oblong membranous cells, parallel to each other, finally 

 bursting into two equal valves. Seeds globular, very minute, 

 having four spiral filaments attached to their base, which termi- 

 nate each in a flat appendage or anther, producing pollen. Name 

 from equus,& horse, and seta, a hair. 476. 



1. E. arvfnse. Corn Horse-tail. Sterile stems decumbent at the 

 base, with undivided, angular, roughish, ascending branches ; fertile 

 stems erect, destitute of branches, their sheaths distant, deeply toothed. 



Fertile stems about eight inches high, appearing before the sterile 



ones, which are from one to two feet high. Perennial : flowers in March 

 and April : grows in fields and meadows : common. Eng. Bot. vol. xxix. 

 pi. 2020. Eng. Fl. vol. iv. p. 337. 1508. 



2. E. Drummondii. Blunt-topped Horse-tail. Sterile stems striate, 

 rough with prominent points, with undivided, angular, rough branches ; 

 fertile stems erect, destitute of branches, their sheaths approximated, with 



narrow, tapering teeth. Perennial: flowers in April. Found by Mr. 



T. Drummond, in Forfarshire. Hooker. Brit FL p. 451. 1509. 



3. E. fluvidtile. Great Water Horse-tail. Sterile stems with very 

 numerous undivided, angular, roughish branches; fertile stems un- 



branched, their sheaths crowded, deeply toothed. Fertile stems from 



one to two ; sterile ones, from two to four feet high. Perennial : flowers 

 in April : grows at the edges of rivers and lakes : frequent. Eng. Bot. 

 vol. xxix. pi. 2022. Eng. FL vol. iv. p. 337. 1510. 



4. E. syhdticum. Wood Hoi'se-tail. Sterile and fertile stems with 



