1056 SELAGINELLACE.\E 



1. SELAGINELLA. Little Clubmoss, Selaginella. 

 Characters of the family. 



Stem rooting only at the base; bracts of the spike broad, thin, spreading; macrospores 



spinulose. 1. S. selaginoides. 

 Stem rooting mostly tlieir whole length; bracts of the spike narrower and thicker, ap- 

 pressed and closely imbricate. 



Leaves without an apical bristle. 2. S. muiica. 

 Leaves with a distinct apical bristle. 



Macrospores smooth or nearly so. 3. S. montanensis. 

 Macrospores with a network of thickened ridges. 

 Leaves abruptly acute; plant dense and tufted. 



Apical bristle yeUowish green. 4. S. Watsonii. 

 Apical bristle wliite. 



Apical bristle 0.3-0.4 mm. long. 5. S. Wallacei. 



Apical bristle 0.6—1.5 mm. long. 6. S. clensa. 

 Leaves gradually tapering towards tlie ape.x; stem long, loose and spreading; 



apical bristle 0.5-1 mm. long. 7. S. Underwoodii. 



1. S. selaginoides (L.) Link. Stems prostrate, creeping, slender; leaves 

 lanceolate, acute, spreading, sparsely spinulose-ciliate; spikes thicker, ascending, 

 3-7 cm. high; bracts lax, ascending, lanceolate or ovate-lanceolate, strongly cili- 

 ate. Mountains: Greenl. — N.H. — Colo. — B.C. Boreal — Mont. 



2. S. mutica D. C. Eaton. Stems creeping, rigid, pinnately branched; 

 leaves 6-ranked, closely imbricate, 1 mm. long, oblong-ovate, obtuse, without 

 terminal bristle; marginal cilia 8-15 on each side, spreading; spikes scarcely 

 thicker than the branches, quadrangular; bracts broader than the leaves, pointed. 

 Mountains: N.AL — Colo. — Ariz. Son. — Suhmont. 



3. S. montanensis Hieron. Stems prostrate, creeping, 4 cm. long; leaves 

 sessile, imbricate, pale glaucous when young, yellowish cinerascent in age, linear- 

 oblong, slightly tapering at the apex, obtuse, cuspidate-setaceous; bristle 0.3-0.4 

 mm. long; marginal cilia 6-9 on each side, about 0.1 mm. long; bracts ovate-tri- 

 angular, pale glaucous, thick, obtusish; bristle 0.25-0.4 mm. long; marginal cilia 

 15-20, tooth-like. S. columbiana A. A. Eat. Mountains: Mont. — -Wash. — B.C. 

 Au-0. 



4. S. Watsoni Underw\ Stems short, 4-6 cm. long, creeping, sparingly 

 branched; leaves short, deeply channeled, abruptly contracted into the bristle; 

 apical bristle 0.25-0.33 mm. long; marginal cilia few or none; spikes 1.5-2.5 cm. 

 long, quadrangular; bracts lance-ovate to ovate, with shorter and stouter bristles. 

 Mountains: Colo. — Calif. Mo7it. — Alp. Jl-S. 



5. S. Wallacei Hieron. Stems up to 3-10 cm. long, sparsely rooting, pin- 

 nately branched; leaves imbricate, pale glaucous when young, yellowish cineras- 

 cent in age, thick, plane above, linear-oblong, contracted at the apex, 2.5 mm. 

 long or less; apical bristle 0.3-0.4 mm. long; marginal cilia 7-12 on each side, 

 nearly 0.1 mm. long; spike up to 1.5 cm. long; bracts ovate-triangular, acute, 

 thick; apical bristle 0.3-0.4 mm. long; marginal cilia 15-20. Rock: B.C. — Ida. — 

 Calif. Suhmont. 



6. S. densa Rydb. Stems densely cespitose, 4-12 cm. long, creeping, densely 

 branched; leaves densely imbricate, pale glaucous when young, dark-cinerascent 

 in age, linear-oblong, 2-3.5 mm. long; apical bristle 0.6-1.5 mm. long; marginal 

 cilia 2-12, nearly 0.1 mm. long; spike 1-3 cm. long; bracts ovate-triangular, 0.3 

 mm. long or less; apical bristle nearly 1 mm. long; cilia 10-20 on each side, less 

 than 0.1 mm. long. S. Engelmannii, S. Bourgeauii, and *S. Ilaydeni Hieron. 

 Hills and mountains: Man. — N.M.— Utah— Wash.— B.C. Plain — Alta. 



7. S. Underwoodii Hieron. Stem elongate, creeping, up to 15 cm. long, 

 sparsely pinnately branclied; leaves densely imbricate, appressed, dark glaucous 

 when young, reddish or cinerascent in age, elongate-triangular, uj) to 2 mm. long; 

 cilia 5-7 on each side, 0.05 mm. long; spike 5-20 mm. long; bracts elongate-tri- 

 angular; bristle 0.2-0.3 mm. long; cilia 12-15. S. Fendleri (Underw.) Hieron., 

 not Baker. Mountains: N.M. — Colo. — Calif. Suhmont. — Mont. 



