52 SAXIFRAGACEAE 



S. pennsylvanica L. Scape 1-3 feet high, downy-pubescent: leaves ob- 

 long-lanceolate, entire or denticulate, petiole broad; flowers cymose-panicu- 

 late: calyx adnate to the base of the ovary, lobes recurved; petals greenish, 

 linear-lanceolate, but little ex-ceding- the calyx; capsule diverging by the beaks 

 into nearly separate follicles. Moist meadows and woods; May-June; fre- 

 quent: Winneshiek. Allamakee, Fayette, Scott, Linn, Johnson, and Cerro 

 ( m r lo counties. 



SULLIVANTIA T & (r. Perennials, with lobed or cut-toothed petioled 

 rounded leaves, and small white flowers in a loose cymose-panicle. Calyx 

 campanulate. adherent to the base of the ovary, 5-cleft. Petals .'L, oblanceo- 

 late. twice the length of the calyx. Stamens 5, included. Capsule 2 celled, 

 .'-beaked, with many wing-margined seeds. 



S. ohionis T. Si G. Stem low, 4-10 inches high, weak, nearly leafless; 

 leaves palraately veined. Limestone cliffs; May-August; infrequent; Jones, 

 Delaware. Jackson, and Cedar counties. (SuUivantia sullivantia ( T. & (J-. ) Brit.) 



MITELLA L. Perennials, with alternate radical leaves and opposite cau- 

 line leaves, and small flowers in a slender spike. Calyx 5-cleft, short, adnate 

 to the base of the ovary. Petals 5, pinnatifid. Stamens 10, included. Styles 

 2, short. Capsule 1-celled, 2-beaked, opening by two equal valves. 



M. diphylla L. Bishop's cap or mitre-wort Stem hairy, 8-16 inches high; 

 leaves cordate acute, dentate, sublobate; radical leaves long-petioled, cauline 

 leaves 2; very short-petioled; flowers white. Rich woods: May-June: frequent; 

 Winneshiek. P'ayette, Scott. Muscatine, Henry, and Johnson counties. 



KEUCHERA L. Perennials, with long-petioled radical leaves, and green- 

 ish or purplish flowers in small clusters, paniculate. Calyx campanulate, 5- 

 cleft, segments obtuse, tube adnate to the base of the ovary. Petals 5, small, 

 spatulate, entire, inserted with the 5 stamens on the throat of the calyx. 

 Styles 2. Capsule 1-celled, 2-beaked, opening between the beaks. 



h|. hispida Pursh. Stem 2-4 feet high; stem, petioles, and veins hirsute 

 with long spreading hairs; leaves rounded, cordate at the base, 5-9-lobed, 

 toothed: flowers greenish, oblique; stamens exserted. Prairies; May-June; 

 common. 



CHRYSOSPLENIUM L. Steins low. Calyx 4-5-lobed, yellow inside, ad- 

 nate to the ovary. Petals wanting. Stamens 8-10, short. Styles 2. Capsule 

 obcordate, 1-celled, 2-valved, many-seeded. 



C. alternifolium L. Golden Saxifrage. Found in a deep ravine among moss; 

 Winneshiek county, the only locality in the state. 



PARNASSIA L. Scape-like perennials with solitary terminal flowers. 

 Calyx deeply 5-parted. imbricated in the bud. persistent. Petals 5, spreading, 

 white, imbricated in the bud. Fertile stamens 5, alternate with the petals. 

 sterile stamens in clusters at the base of the petals. Stigmas 4, sessile. Ova- 

 ry 1-celled, with 4 parietal placentas. Seeds winged. 



P. carcliniana Mx. Scapes glabrous, 10-20 inches high, with one sessile 

 leaf near the base; radical leaves petioled. round-oval: sterile stamens in each 

 cluster 3, gland-tipped; petals ovate, obtuse, greenish veined. .V4 times the 

 Length of the sepals. Wet meadows and river banks: June-August; infre- 

 quent: Emmet, layette. Muscatine, Johnson, and Story counties. 



HYDRANGEA L. Shrubs, with opposite petioled exstipulate leaves, and 

 corymbose often apetalons flowers. Calyx-tube hemispheric, adnate to the 

 ovary, 8-10-ribbed, I &-lobed. Petals 4-5. Stamens 8-10, inserted on the disk. 

 Styles '. diverging. Ovary 2-4-celled. Capsule membranous, 2-celled, many- 

 seeded, about L5-ribbed. 





