SAXIFKAGACEAE 503 



5. TIARELLA L. 



Perennial herbs usually with leafy runners. Leaves mostly at the base of the 

 plant, except on the runners. Petals with narrow blades. Stamens 10, the filaments 

 elongated. Styles unequal. Follicles unequal, with erect beaks. Spring. FALSE 

 MITREWORT. 



Terminal leaf-lobe ovate, larger than the others: petals long-clawed. 1. T. cordifolia. 



Terminal leaf -lobe triangular, not larger than the others: petals short-clawed. 2. T. macrophylla. 



1. Tiarella cordifolia L. Leaf -blades mostly 3-7 cm. wide ; petioles mostly 

 hirsute: flowering branches scaly: sepals typically oblong: petals about 4 mm. long, 

 the claw over \ as long as the acuminate blade : capsules slender-beaked. 



In woods, Nova Scotia to Minnesota, Georgia and Alabama. 



2. Tiarella macrophylla Small. Leaf -blades mostly 12-20 cm. wide; petioles 

 mostly glabrous: flowering branches leafy: sepals typically ovate or oval: petals 

 2.5-3 mm. long, the claw less than as long as the acute blade: capsules short -beaked. 



In woods, mountains of North Carolina. 



6. THEROPHON Kaf. 



Perennial herbs without runners. Leaves mainly cauline. Petals with broad 

 blades. Stamens 5, the filaments short. Styles equal. Follicles with spreading beaks. 



1. Therophon aconitifolium (Nutt.) Millsp. Plants 2-10 dm. tall: leaf -blades 

 4-18 cm. wide, 5-9-lobed and incised-serrate : sepals triangular-ovate to broadly lance- 

 olate, about 1 mm. long: petals 3-3.5 mm. long; blades oval to orbicular-ovate: cap- 

 sules 3-4 mm. long. 



In mountain streams, Virginia and West Virginia to Georgia and Tennessee. Spring 

 and summer. 



7. MICRANTHES Haw. 



Acaulescent herbs, with very short caudices. Leaf -blades ovate to flabellate or 

 rarely cordate at the base. Petals nearly equal. Carpels slightly united below. 

 SAXIFRAGE. 



Filaments subulate or filiform-subulate. 



Cymules compact: petals but little longer than wide. 1. M. Texana. 



Cymules open or lax: petals much longer than wide. 



Petals wholly white, destitute of yellow spots. 2. M. Virginiensis. 



Petals bimaculate, each with 2 yellow spots below the middle. 



Petals lanceolate to oblong-lanceolate: follicles 4-5 mm. long. 3. M. Tennesseensis. 

 Petals elliptic to oblong: follicles 2.5-3 mm. long. 4. M. Careyana. 



Filaments clavate. 



Leaf-blades not elongated: petals bimaculate. 5. M. Cqroliniana. 



Leaf-blades elongated: petals wholly white. 6. M. micranthidifolia 



1. Micranthes Texana (Buckl.) Small. Leaves 2-4.5 cm. long; blades ovate, 

 varying to obltog-ovate or orbicular-ovate: cymules aggregated into a head or in heads 

 terminating the inflorescence-branches: petals oval to ovate or broadly obovate to 

 suborbicular, 2.5-3 mm. long. 



On hillsides and barrens, Texas and Missouri. Spring. 



2. Micranthes Virgini6nsis (Michx.) Small. Leaves 2-20 cm. long; blades 

 ovate, oval or oblong: cymules becoming lax, the axis often elongated: petals oblong 

 to elliptic, 4-5.5 mm. long. 



On rocks and banks, New Brunswick to Minnesota, Georgia and Tennessee. Spring. 



3. Micranthes Tennessensis Small. Leaves 4-13 cm. long; blades ovate, 

 sometimes suborbicular or oblong-ovate or occasionally orbicular-renif orm : cymules 

 open : petals lanceolate to oblong-lanceolate, 4-4.5 mm. long. 



On rocky bluffs, Tennessee River, Tennessee. Spring. 



4. Micranthes Careyana (A. Gray) Small. Leaves 2-11 cm. long; blades ovate 

 to orbicular-ovate or somewhat reniform: cymules lax: petals elliptic to oblong, 2.5-3 

 mm. long: follicles 2.5-3 mm. long. 



On mountain cliffs, North Carolina and Tennessee. Spring. 



