SAXIFRAGACE^E. (SAXIFRAGE FAMILY.) 171 



4. SULLIVANTIA, 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). Pedun- 

 fles and calyx glandular ; pedicels recurved in fruit. (Dedicated to the dis- 

 tinguished bryologist who discovered our species.) 



1 S. Ohi6nis, Torr. & Gray. Limestone cliffs, Ohio to Ind., Iowa, and 

 Minn. June. 



5. TIARELLA, 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 rtdpot, 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. cordifdlia, 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. MITELLA, 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 placentae, 2- 

 valved at the summit. Seeds smooth and shining. Low and slender peren- 

 nials, 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. diphylla, L. Hairy; leaves heart-shaped, acute, somewhat 3-5- 

 lobed, toothed, those on the many-flowered stem 2, opposite, nearly sessile, with 

 iuterfoliar 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. nuda, L. Small and slender, leaves rounded or kidney-form, deeply 

 and doubly crenate ; stem usually leafless ^few-flowered, very slender (4 - 6 X high) ; 

 flowers greenish j stamens 10. Deep moist woods, in moss, N. Eng. to N. Y., 

 Mich., Minn , and northward. May - July. 



7. HE "ETCHER A, L. ALUM-ROOT. 



Calyx bell-shaped, the tube cohering at the base with the ovary, 5-cleft. Pet- 

 als 5, spatulate, small, entire. Stamens 5. Styles 2, slender. Capsule 1-celled, 



