HORSETAIL FAMILY 



10. Equisetum variegatum Schleich. 

 Variegated Equisetum. (Fig. 86. ) 



Kijuisftitm ->aric-atnm Schleich. Cat. PI. Helvet. 27. 

 1807. 



Stems slender, perennial, evergreen, 6'-i8' long, 

 rough, usually simple from a branched base, com- 

 monly tufted, 5-io-furrowed, the stomata borne in 

 regular rows. Sheaths campanulate, distinctly 

 4-carinate, green, variegated with black above, the 

 mediau furrow deep and excurreut to the teeth and 

 downward to the ridges of the stem, the teeth 5-10, 

 each tipped with a deciduous bristle ; central cav- 

 ity small, rarely wanting. 



Labrador and Greenland to the Northwest Territory, 

 south to New Hampshire, western New York, Nebraska 

 and Nevada. Also in Europe and Asia. May-June. 



ii. Equisetum scirpoides Michx. Sedge- 

 like Equisetum. ( Fig. E 



Equisetum scirpoides Michx. Fl. Bor. Am. 2:381. 1803. 



Stems perennial, evergreen, very slender or filiform. 

 3'-6' long, somewhat rough, flcxuous and curving, 

 growing in slender tufts, mostly 6-furrowcd with acute 

 ridges, simple or branching from near the base. 

 Sheaths 3-toothed, distinctly 4-carinate, the central 

 furrow broad, the lateral narrow, the bristly teeth 

 rather persistent ; central cavity entirely wanting. 



On moist or wet wooded hank-. I. \Uska, 



south to Pennsylvania. Illinois ami llriti-!i Columbia. 

 Also in Europe and Asia. May JHIU-. 



Family 9. LYCOPODIACEAE Michx. Fl. Bor. Am. 2 : 281. 1803. 



CLUH-MOSS FAMILY. 



Somewhat moss-like, erect or trailing terrestrial herbs with nuineru- -m.ill 

 lanceolate or subulate simple leaves, sometimes oblong or nmndi^'. ed in 



2-many ranks, the stems often elongated, usually freely branching. 

 i-3-celled, solitary in the axils of the leaves or on their upper -urt 

 uniform, minute. Prothallia (as far as known ) mostly subterranean, with or 

 without chlorophyll, monoecious. 



Four genera and about no species. Besides the following. /'//./. l-Tofid*. the two 



other genera only in Australia. 



i. LYCOPODIUM L, Sp. PI. uoo. 17 



Perennial plants with evergreen i-nerved leaves arranged in 4-16 rank*. 

 coriaceous, flattened, reniform, i-celled, situated in the axils of ordinary Cleave* 

 of the upper modified, bract-like ones, which are imbricated in sess 

 spikes, opening transversely into 2 valves, usually by a line around the margin 

 of one kind, copious, sulphur-yellow, readily inflammable from the abunda 

 [Greek, meaning wolf's-foot, perhaps in allusion to the branching roots of *ome 



About TOO species of wide geographic distribution, the largest occurring in th 

 America and in the Himalayas. 



