selaginellacejE. 141 



12. s. Douglasll (H. & G.) Spring. Stems 3'— 12' long, 

 branches 2' — 6' long, bi — tripinnately divided ; leaves of lower 

 plane i" long, obliquely oval, obtuse, faintly nerved; leaves of 

 upper plane half as long, oval, incurved, ending in a short 

 point, both sparingly ciliate at base; spikes 6" — 12" long, quad- 

 rangular, terminal ; bracts deltoid-cuspidate, strongly imbri- 

 cate. (Lycopodium Douglasii H. & G., L. ovalifolium H. & G.) 

 Northern California to British Columbia. 



tt Stems mostly annual, fugacious ; leaves mostly membranous, 

 flaccid. 



13. S. apus(L.) Spring. Stems i' — 4' long, slender, angled on 

 the face, prostrate, creeping, much-branched, flaccid ; leaves of 

 the lower plane spreading above, the lower reflexed; ovate, acute, 

 serrulate, not distinctly ciliate ; leaves of the upper plane ovate, 

 shortly cuspidate; spikes 3" — 6" long; bracts ovate, acute, 

 membranous, strongly serrulate, acutely keeled in the upper 

 half. Canada and New England to Rocky Mountains, and 

 southward to Florida and Texas. 



14. S.. Ludoviciana A. Br. Stems slender, copiously pin- 

 nate, flat both sides, 4' — 6' long, lower branches slightly com- 

 pound ; leaves of lower plane rather distant except at tips of 

 branches, spreading, ovate-oblong, sub-acute, firmer in texture 

 than in preceding, serrulate, not distinctly ciliate ; leaves of 

 upper plane half as long, obliquely oblong, cuspidate; spikes 

 3" — 6" long ; bracts ovate-lanceolate, strongly keeled. {_S. 

 apus, var. denticulata Spring, where it may belong, the differ- 

 ences possibly due to climatic conditions.) Covington, Louisi- 

 ana {Drummondy, Aspalaga, Florida (Curtiss, No. 3799 in 

 part). 



** Stems densely tufted, rolling into a nest-like ball when dry ; 

 roots confined to base of stems. 



15. S. lepidophylla Spring. Stems 2' — 4' long, densely 

 tufted, pinnately branched to the base, the pinnae ascending, 

 sub-flabellately compound ; leaves of the lower plane closely 

 imbricate, ascending, obliquely ovate, obtuse, thick, rigid, mi- 

 nutely ciliate, green above, paler below, becoming reddish-brown 

 in age ; leaves of upper plane nearly as long, obliquely ovate, 

 obtuse; spikes 3" — 6" long, quadrangular; bracts deltoid, 

 acutely keeled. Texas to Arizona. 



