SAXIFRAGE FAMILY 



113 



Sinus of the leaf-blades open; petals exceeding the sepals. 



12. H. parvifoUa. 

 Leaf-blades cleft at least one-half to the base. 13. H. flabeUifolia. 

 Hypanthium deeply campauulate or urceolata, with the sepals 5-10 mm. long. 

 Flowering branches and petioles pubescent. 



Flowers greeaish ; leaf-blades reniform or rounded, deeply cordate at the base 



lobes and teeth rounded; petioles long-hairy. 14. H. chlorantha. 



Flowers yellowish; leif-blades broadly oval to orbicular, truncate or slightly 

 cordate at the base. 

 Leaf-blades thick, densely glandular-pubescent, 1.5-4 cm. wide, rarely 



cordate at the base. 15. H. ovalifolia. 



Leaf-blades thin, glabrous, or hairy only on the veins, 3-6 cm. wide, cordate 

 at the base. 16. H. cylindrica. 



Flowering branches and petioles glabrous or finely puberulent. 



Flowers yellowish; leaf-blades rounded-oval to orbicular, truncate or slightly 



cordate at the base, only the earliest reniform. 17. H. glabella. 



Flowers greenish; leaf-blades thin, reniform or rarely rounded, with deeply 

 cordate base. 18. H. tenuifoHa. 



1. T. unifoliata. 



1. H. ranunculifolia. 



1. S. MOlacea. 



1. S. Hapemanii. 



1. T. majus. 



10. TIARELLA L. False Miterwort. 



11. HEMIEVA Raf. 



12. SUKSDORFIA A. Gray. 



13. SULLIVANTIA T. & G. 



14. THEROPHON Raf. 



15. TELESONIX Raf. 



Petals twice as long as the sepals; blades almost orbicular; beaks of the pistils united 

 almost to the top. 1. T. Jamesii. 



Petals equalling or slightly exceeding the sepals; blades obovate-spatvilate; beaks of the 

 pistils united halfway up. 2. T. heucheriformis. 



16. SAXIFRAGA (Toum.) L. Saxifrage. 



Flowers normal, none of them represented by clusters of bulblets. 



Petals not abruptly narrowed into claws; leaf-blades thick, the lower ones mainly 



3-lobed. 1. iS. rivularis. 



Petals abruptly narrowed into claws ; leaf-blades thin, the lower ones 5— 7-lobed. 



2. S. debilis. 

 Flowers below the terminal one replaced by clusters of bulblets. 



Lobes of the stem-leaves linear to triangular-lanceolate; petals cuneate. 



3. S. cernua. 

 Lobes of the stem-leaves broad and rounded, as broad as long or broader; petals fiddle- 

 shaped. 4. S. simulata. 



17. MUSCIRIA Haw. Saxifrage. 



Leaves of the caudex with entire or slightly 3-toothed blades. 

 Leaves of the caudex with 3-cleft or prominently 3-lobed blades. 

 Petals less than 2 mm. long. 

 Petals over 2 mm. long. 

 Petals 2..5-3.5 mm. long. 

 Petals 4.5-7 mm. long. 



Sepals oblong-lanceolate to triangular-lanceolate; hypanthium turbinate 



during anthesis. 4. M. monticola. 



Sepals broadly ovate to half-orbicular; hypanthium campanulate during an- 

 thesis. 5. M. caespitosa. 



18. CHONDROSEA Haw. l. C. Aizoon. 



19. MICRANTHES Haw. Saxifrage. 



Filaments subulate or filiform-subulate, or sometimes narrowly linear. 



Cymules wholly or mainly aggregate into a head or spike, 1 or 2 lower ones some- 

 times remote or peduncled. 

 Petals shorter than the sepals or about equalling them. 

 Lower cymules sessile; petals about equalling the sepals. 

 Lower cymules peduncled; petals shorter than the sepals. 

 Petals obovate to oval or orbicular-oval. a. 



Petals oblong to cuneate. 3. 



Petals larger than the sepals. 



Sepals ovate to triangular. 4. 



Sepals oval, rounded at the apex. 5. 



Cymules in narrow pyramidal panicles. 

 Corolla present. 

 Petals white. 



Leaves with blades narrowed into petiole-Uke bases. 6. M. Greenei. 

 Leaves without petiole-like bases. 



1. M. adscendens. 



2. M. micropetala. 



3. M. delicaiula. 



1. M. Rydbergii. 



2. M. crenalifolia. 



3. M. Columbiana. 



M. rhomboidea. 

 M. austrina. 



