Genus 8. 



SAXIFRAGE FAMILY. 



8. CHONDROSEA Haw. Saxifr. Enum. lo. 1821. 



Perennial herbs, with denscl) leafy short caudices and offsets and sparingly leafy 

 flower-stems, and alternate serrate leaves with each tooth white-encrusted, the flowers in 

 terminal compound cymes. Calyx-lobes 5, erect. Corolla white or sometimes colored, 

 regular, the petals broad, clawless. Stamens 10; filaments lanceolate to lanceolate-subulate. 

 Ovary about one-half inferior, the carpels united to above the middle. Follicles united up 

 to the more or less spreading tips. [Greek, referring to the texture of the leaves.] 



About 9 species, most abundant in the mountains of middle Europe. Type species : Chondrosea 

 pyramidalis Haw. 



I. Chondrosea Aizoon (Jacq.) Haw. Livelong Saxifrage 



^1 



Saxifraga Aizoon .Tacq. FI. Austr. 5 : 18. pi. 4sS. 17/8. 

 Chondrosea Aizoon Haw. Saxifr. Enum. 11 1S.21. 



Leaves clustered in a dense rosette at the base of the 

 bracted flowering stem ; plant spreading by offsets, so that 

 several are often joined together. Leaves 4"-i2" long, 

 spatulate, thick, obtuse and rounded at the apex, the 

 margins serrulate with sharp hard white teeth ; scape 

 erect, viscid-pubescent, 4'-io' high ; floviers several or 

 numerous, corymbose, yellowish, about 3" broad ; caly.x- 

 lobes ovate-oblong, obtuse, viscid, shorter than the obo- 

 vate, often spotted petals ; capsule tipped by the divergent 

 styles, its base adnate to the calyx. 



On dry rocks, Mt. Mansfield, Vermont ; Quebec to Labra- 

 dor, west to Lake Superior and Manitoba. Also in alpine and 

 arctic Europe. Summer. 



9. THEROFON Raf. New Fl. N. A. 4: 66. 1836. 



[BoYKiNiA Xutt. Journ. Acad. Phila. 7 : 113. 1834. Not Raf.] 

 Glandular-pubescent perennial herbs, with alternate peti- 

 oled orbicular or reniform leaves, and small white perfect 

 flowers in branching panicles. Calyx-tube top-shaped or 

 subglobose, adnate to the ovary, its limb 5-lobed. Petals 5, 



deciduous, inserted on the calyx-tube. Filaments short. Ovary 2-celIed (rarely 3-celled) ; 

 styles 2, rarely 3. Capsule 2-celled, the beaks of the carpels divergent. Seeds numerous, the 

 testa shining, minutely punctate. [Greek, beast-killing; an old name of aconite.] 



About 10 species, natives of the_^ southern AUeghanies and the mountains of western North 



America. Type species: Bovkiuia aconilifoiia 

 Nutt. 



I. Therofon aconitifolium (Xutt.) 

 Alillsp. Aconite Saxifrage. Fig. 2170. 



Boykinia aconilifoiia Nutt. Journ. .Acad. Phil. 



7: 113. i8-4. 

 Therofon napelloides Raf. New Fl. 4 : 66. 1S36. 

 Saxifraga aconilifoiia Field. Sert. PI. pi. sr'. 



1S44. 

 Therofon aconitifolium Millsp. Bull. West Va. 



Agric. Exp. Sta. 2: 561. 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 S-7-lobed. the lobes ob- 

 ovate or oval, sharply incised-serrate ; upper 

 leaves short-petioled; bracts of the inflores- 

 cence foliaceous, incised; cymes panicled; 

 pedicels and calyx viscid ; 'flowers wliite, 

 about 2" broad; calyx-lobes lanceolate, 

 erect; petals oblanceola'te, spatulate at base; 

 capsule adnate to the calyx-tube, only its 

 diverffent beaks free. 

 In woods, mountains of southwestern Virginia to North C-roIina, Tennessee and Georsia. July. 



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



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

 slightly lobed leaves, and small white cymose-panicnlate flowers. Calvx-tube campannlate. 

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



