VOL. II.] 



SAXIFRAGE FAMILY. 



177 



i. Therofon aconitifolium (Nutt.) Millsp. Aconite Saxifrage. (Fig. 1840.) 



Boykinia aconitifolia Nutt. Journ. Acad. Phil. 

 7: 113. 1834. 



Therofon napelloides Raf . New Fl. 4: 66. 1836. 

 Saxifraga aconitifolia Field. Sert. PI. pi. 57. 

 1844. 



Therofon aconitifolium Millsp. Bull. West Va. 

 Agric. Exp. Sta. 2: 361. 1892. 

 Stem rather stout, erect, i-2 high. 

 Lower and basal leaves long-petioled, reni- 

 form-orbicular, cordate or truncate at the 

 base, slightly scabrous above, glabrous or 

 with a few scale-like hairs along the veins 

 beneath, palmately 5-7-lobed, the lobes ob- 

 ovateor oval, sharply incised-serrate; upper 

 leaves short-petioled; bracts of the inflores- 

 cence foliaceous, incised; cymes panicled; 

 pedicels and calyx viscid; flowers white, 

 about 2" broad; calyx-lobes lanceolate, 

 erect; petals oblanceolate, spatulate at base; 

 capsule adnate to the calyx-tube, only its 

 divergent beaks free. 



In woods, mountains of southwestern Vir- 

 ginia to North Carolina, Tennessee and Georgia. 

 July. 



4. SULLIVANTIA T. & G. Am. Journ. Sci. 42: 22. 1842. 



Slender perennial herbs, with mainly basal long-petioled reniform-orbicular crenate or 

 slightly lobed leaves, and small white cymose-paniculate flowers. Calyx-tube campanulate, 

 adnate to the base of the ovary, its limb 5-lobed, the lobes erect. Petals 5, spatulate, 

 marcesceiit. Stamens 5, inserted at the base of the calyx-lobes. Filaments short. Ovary 

 2-celled, 2-beaked, ripening into a 2-beaked capsule. Styles 2. Ovules oo. Seeds winged 

 on both sides. [Named in honor of William Starling Sullivant, 1803-1873, American botanist.] 



Two known species, the following of eastern North America, the other of the western States 

 The genus is hardly sufficiently distinct from Therofon. 



i. Sullivantia Sullivantii (T. & 



G.) Britton. Sullivantia. 



(Fig. 1841.) 



.Saxifraga (?) Sullivantii T. & G. Fl. N. A. 



i: 575. 1840. 

 Sullivantia Ohionts T. & G. Am. Journ. Sci. 



42: 22. 1842. 



Stem scapose, nearly leafless, weak, re- 

 el inedj slightly glandular-pubescent, 6'- 

 15' long. Leaves long-petioled, *.'-$' 

 wide, and wider than long, reniform- 

 cordate at the base, crenate-dentate or 

 somewhat lobed, sparingly pubescent or 

 glabrous; panicle ample, sometimes leafy- 

 bracted, loose, glandular; pedicels slen- 

 der, recurved in fruit; flowers white, about 

 i" broad; calyx-lobes ovate, acutish; 

 petals entire, exceeding the stamens. 



On cliffs, Ohio to Minnesota, Wisconsin 

 and Iowa. June. 



5. TIARELLA L. Sp. PI. 405. 1753. 



Perennial slender erect herbs, with the leaves mainly basal, long-petioled, lobed or 3- 

 foliolate, small stipules adnate to the petiole, and white pedicelled racemose or paniculate 

 flowers. Calyx-tube campanulate, nearly or quite free from the base of the ovary, its limb 

 5-lobed. Petals 5, clawed. Stamens 10; filaments elongated. Ovary i-celled; styles 2; ovules 

 oo . Capsule membranous, i-celled, 2-valved, the valves usually unequal. Seeds usually few, 

 ovoid or globose, smooth, not winged. [Diminutive of tiara, from the form of capsule.] 



About 6 species, natives of North America, Japan and the Himalayas. Besides the following, 

 3 others occur in the western parts of North America. 



