534 The Ohio Naturalist. [Vol. VI, No. 7, 



Hcrherta S. F. Gray. 



Stem erect, nearly simple; leaves curved and one-sided, deeply 

 lobed, lobes lanceolate. Perianth ovate-subvilate or narrowly 

 fusiform, 3-angled, deeply 4-8 lobed. adunca S. F. Gray • 



Jiihula Dumort. 



Subdichotomovisly branching; leaves dark olive green, obliquely 

 ovate, acute, entire or subrepand; underleaves roundish, ser- 

 rate or entire; involucral leaves bifid, serrate; perianth tri- 

 angular-obpyriform. 



HutchinsicB Dumort. var. SuUivantii S]iruce. 

 J un^crmannia Micheli. 



i. Leaves complicate-concave, almost always eriually bilobed. 2. 

 Leaves not complicate-concave. 4. 



2. Stem densely covered with rootlets; leaves distant, oval witli ol)- 



tuse, almost rectangtilar sinus and acute lobes; involucral 

 leaves 2-3 lobed, spinulose-serrate; perianth ovate, obtuse, 

 the mouth contracted and ciliate. Monoecious. 



Hcllcriatia Nees. 

 Stem sparsely covered with rootlets or frequently without any. 

 Dioecious. 3. 



3. Leaves erect, spreading, subsaccate at base, their dorsal part far 



overlapping the stem, subquadrate, with acute sinus, reaching 

 }/2, of the leaf, and acute, often incurved lobes; involucral 

 leaves 2-3 lobed, denticulate above; perianth ovate-clavate, 

 5-6 plicate above, much contracted and long-fringed. 



Michauxii Weber. 

 Leaves very regularly arranged in 2 rows (thus giving the plant a 

 comb-like appearance), keeled, the lobes acute to obtuse; 

 involucral leaves larger, the inner ones trifid; perianth oval- 

 oblong, the mouth somewhat contracted and ciliate-dentate. 



mitinta Crantz. 



4. Leaves entire or barely refuse. 5. 

 Leaves 2- or more lobed or -dentate. 7. 



5. LTnderleaves present (not apparent on old stems), broadl}' subu- 



late; upper involucral leaves laciniate. Schradcri Martins. 



L^nderleaves AA'anting; involucral leaves like the cauline. 6. 



6. Leaves orbicular, decvirrent dorsally; perianth exserted, obovate— 



oblong, the mouth 4-cleft; capsule globose. 



sphcerocarpa Hook. 

 Leaves ovate-elliptical; perianth fusiform, plicate above and den- 

 ticulate; capsule oval. pumila With. 



7. Leaves bilobed or bidentate. 8. 



Leaves 3-6 lobed or dentate, seldom 2-dentate. 16. 



8. LTnderleaves present. 9. 



(Jtmgermannia alpestris and J. ventricosa may be sought here) 

 Underleaves wanting. 10. 



9. Leaves vertical, bifid, the lower leaves with usually acute sinus 



and lobes, the upper much larger with rounded lobes and 

 obtuse sinus; underleaves entire or the broader bifid; perianth 

 Avithout involucral leaves, dorsal. ■ ■ ■« GiUmani Aust. 



Ix'aves subvertical or spreading, emarginately bilobed, tlic lo1)es 

 acute or the upper obtuse; underleaves .somewhat obsolete or 

 subulate, incurved; involucral lc;i^-es little larger, less deeply 

 lobed; perianth terminal. Wattiaua Aust. 



10. Leaves 2-toothed. 11. 



Leaves bifid or 2- 3-or more lobed. 13. 



11. Leaf lobes obtu.se with an obtuse sinus'or acute~in the u])])er 



leaves; perianth pellucid, reddish below. Wallrothiana Nees. 

 Leaf lobes 'acute. 12. 



