2. J. sphærocárpa, Hook. Stems creeping, the tips ascending, subsimple, greenish; leaves semi-vertical, rather rigid, orbicular, obliquely spreading, decurrent dorsally, pale green; involucral leaves separate; perianth exserted, obovate-oblong, the mouth 4-cleft; capsule globose.—Mountains of N. Eng. (Austin); rare. (Eu.)
3. J. pùmila, With. Stems creeping, the tips somewhat ascending, subsimple, rooting, pale; leaves ascending, ovate, obtuse, concave, entire; involucral leaves like the cauline, erect; perianth terminal, fusiform, plicate above and denticulate; capsule oval.—On shaded rocks along rivulets, Closter, N. J. (Austin). (Eu.)
§ 2. LOPHÒZIA. Leaves roundish or subquadrate, bidentate, bifid, or sometimes 3–5-cleft; underleaves none, or small and mostly 2-parted; perianth usually strongly plicate.
[*] Underleaves present.
[+] Leaves bifid or 2-lobed.
4. J. Gillmàni, Aust. Stems short, densely cespitose, prostrate, strongly radiculose; leaves vertical, round-ovate, subconcave, 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 without involucral leaves, dorsal, sessile, obovate, subgibbous, ciliate, at length much incised.—In a sandstone cave, Traine Island, L. Superior (Gillman).
5. J. Wattiàna, Aust. Stems rather thick, 2–4´´ long, fragile, subflexuose, strongly radiculose; leaves subvertical or spreading, subovate, concave, emarginately 2-lobed, the lobes acute or the upper obtuse; underleaves somewhat obsolete, hair-like or subulate, incurved; involucral leaves little larger, less deeply lobed; perianth terminal, small, ovate-gourd-shaped, whitish, ciliate.—On the ground, northern shore of L. Superior (Macoun).
[+][+] Leaves 3–5-cleft.
6. J. barbàta, Schreb. ([Pl. 25.]) Procumbent, sparingly branched; leaves roundish-quadrate, with obtuse, acute, or mucronulate lobes and obtuse undulate sinuses; underleaves broad, entire or 2-toothed, sometimes obsolete; perianth ovate, plicate-angled toward the apex, denticulate.—On rocks in mountain regions; common. (Eu.)
Var. attenuàta, Martius. Ascending, with numerous offshoots; stem-leaves semi-vertical, obliquely spreading, roundish, acutely 2–4-toothed, those of the shoots closely imbricate, premorsely 2–4-denticulate; involucral leaves two, 3-toothed; perianth oblong.—In similar localities. (Eu.)