SAXIFRAGACE^E. (SAXIFRAGE FAMILY.) 169 



or most of the flowers changed into little tufts of green leaves ; petals all lanceo- 

 late and tapering into the claw. Mount Katahdin, Maine (Rev. J. Blake) and 

 high northward. (Eu.) 



8. BOYKINIA, Nutt. BOYKINIA. 



Calyx-tube top-shaped, coherent with the 2-celled and 2-beaked pod. Sta- 

 mens 5, as many as the deciduous petals, these mostly convolute in the bud. 

 Otherwise as in Saxifraga. Perennial herbs, with alternate palmately 5-7- 

 lobed or cut petioled leaves, and white flowers in cymes. (Dedicated to the 

 late Dr. Boykin of Georgia.) 



1. B. aconitifblia, Nutt. Stem glandular (6' -20' high); leaves deeply 

 5 - 7-lobed. Mountains of S. W. Virginia, and southward. July. 



9. SULLIVANTIA, Torr. & Gray. SCLLIVANTIA. 



Calyx bell-shaped, cohering below only with the base of the ovary, 5-cleft. 

 Petals 5, entire, acutish, withering-persistent. Stamens 5, shorter than the 

 petals. Pod 2-celled, 2-beaked, many-seeded, opening between the beaks : the 

 seeds wing-margined, imbricated upwards. A low and reclined-spreading per- 

 ennial 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 scape (6' -12' long). Peduncles and calyx 

 glandular : pedicels recurved in fruit. (Dedicated to the distinguished bryolo- 

 gist who discovered the only species.) 



1. S. Ohibnis, Torr. & Gr. (Gray, CUoris Bor.-Am., pi 6.) Limestone 

 cliffs, Highland County, Ohio, Sullivant ; Wisconsin River, Lapham. June. 



10. HEITCHERA, 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. Pod 1 -celled, 

 with 2 parietal many-seeded placentae, 2-beaked, opening between the beaks. 

 Seeds oval, with a rough and close seed-coat. Perennials, with the round 

 heart-shaped leaves principally from the rootstock ; those on the scapes, if any, 

 alternate. Petioles with dilated margins or adherent stipules at their base. 

 Flowers in small clusters disposed in a prolonged and narrow panicle, greenish 

 or purplish. (Named in honor of John Henry Heucher, a German botanist of 

 the beginning of the 18th century.) 



* Flowers small, loosely panicled : stamens and styles exserted : calyx regular. 



1. H. villdsa, Michx. Scapes (l-3high), petioles, and veins of the 

 acutely 7-9-lobed leaves beneath villous with rusty hairs; calyx l" long ; petals 

 spatulate-linear, about as long as the stamens, soon- twisted. Rocks, Maryland, 

 Kentucky and southward, in and near the mountains. Aug. - Sept. 



2. H. Americana, L. (COMMON ALUM-BOOT.) Scapes (2 -3 high), 

 &c. glandular and more or less hirsute with short hairs ; leaves roundish, with 

 short rounded lobes and crenate teeth ; calyx broad, 2" long, the spatulate petals 

 not longer than its lobes. Rocky woodlands, Connecticut to Wisconsin and 

 southward. June. 



