4. SULLIVÁNTIA, Torr. & Gray. Calyx bell-shaped, cohering below only with the base of the ovary, 5-cleft. Petals 5, oblanceolate, entire, acutish, withering-persistent. Stamens 5, shorter than the petals. Capsule 2-celled, 2-beaked, many-seeded, opening between the beaks, the seeds wing-margined, imbricated upward.--A low and reclined-spreading perennial herb, with rounded and cut-toothed or slightly lobed smooth leaves, on slender petioles, and small white flowers in a branched loosely cymose panicle, raised on a nearly leafless slender stem (6--12´ long). Peduncles and calyx glandular; pedicels recurved in fruit. (Dedicated to the distinguished bryologist who discovered our species.) 1. S. Ohiònis, Torr. & Gray.--Limestone cliffs, Ohio to Ind., Iowa, and Minn. June. 5. TIARÉLLA, L. FALSE MITRE-WORT. Calyx bell-shaped, nearly free from the ovary, 5-parted. Petals 5, with claws, entire. Stamens 10, long and slender. Styles 2. Capsule membranaceous, 1-celled, 2-valved; the valves unequal. Seeds few, at the base of each parietal placenta, globular, smooth.--Perennials; flowers white. (Name a diminutive from τιάρα, _a tiara_, or turban, from the form of the pod, or rather pistil, which is like that of Mitella, to which the name of _Mitre-wort_ properly belongs.) 1. T. cordifòlia, L. Leaves from the rootstock or summer runners heart-shaped, sharply lobed and toothed, sparsely hairy above, downy beneath; stem leafless or rarely with 1 or 2 leaves (5--12´ high); raceme simple; petals oblong, often subserrate.--Rich rocky woods, N. Eng. to Minn. and Ind., and southward in the mountains. April, May. 6. MITÉLLA, Tourn. MITRE-WORT. BISHOP'S-CAP. Calyx short, coherent with the base of the ovary, 5-cleft. Petals 5, slender, pinnatifid. Stamens 5 or 10, included. Styles 2, very short. Capsule short, 2-beaked, 1-celled, with 2 parietal or rather basal several-seeded placentæ, 2-valved at the summit. Seeds smooth and shining.--Low and slender perennials, with round heart-shaped alternate leaves on the rootstock or runners, on slender petioles; those on the flowering stems opposite, if any. Flowers small, in a simple slender raceme or spike. Fruit soon widely dehiscent. (Diminutive of _mitra_, a cap, alluding to the form of the young pod.) 1. M. diphýlla, L. _Hairy; leaves heart-shaped, acute_, somewhat 3--5-lobed, toothed, _those on the many-flowered stem 2, opposite, nearly sessile_, with interfoliar stipules; flowers white, in a raceme 6--8´ long; stamens 10.--Hillsides in rich woods; N. Eng. to N. C., west to Minn. and Mo. May. 2. M. nùda, L. Small and slender; _leaves rounded or kidney-form_, deeply and doubly crenate; _stem usually leafless, few-flowered_, very slender (4--6´ high); flowers greenish; stamens 10.--Deep moist woods, in moss, N. Eng. to N. Y., Mich., Minn., and northward. May--July. 7. HEÙCHERA, L. ALUM-ROOT.