Saxifrage Family 189 



racemose, cymose or paniculate flowers. Calyx 4-5-lobed 

 or 4-5-parted, free or adnate to the ovary, usually per- 

 sistent. Petals 45, perigynous. Stamens equaling the 

 petals in number or twice as many, perigynous. Car- 

 pels 1-several, more or less united into a compound super- 

 ior or inferior ovary ; styles distinct or united. Fruit a 

 capsule, follicle or berry. Seeds usually numerous ; en- 

 dosperm generally copious, fleshy ; embryo small, terete. 



Herbs. 



Ovary with 2, rarely more, cells. 



Stamens 5. 1. THEROFON. 



Stamens 10. 2. SAXIFRAGA. 



Ovary 1-celled. 



Stamens 5. 3. HEUCHERA. 



Stamens 10. 4. LITHOPHRAGMA. 



Shrubs. 5. RISES. 



1. THEBOFON Raf. 



Perennial herbs with creeping rootstocks and leafy 

 stems. Leaves alternate, round-reniform, palmately 

 lobed and incised or toothed with callous glandular tips ; 

 petiole mostly with a stipular dilation at base. Flowers 

 white, paniculate or in corymbose-cymes. Calyx 5-lobed, 

 the tube adherent to the ovary, at length globular or 

 ovate. Petals 5, entire. Stamens short, alternating 

 with the petals ; anthers 2-celled. Ovary 2-celled. 

 Fruit a capsule, dehiscent down the styliferous beaks. 

 Seeds ovoid, minutely papillose. 



1. T. elatum (Nutt.) Greene. Slender, 3-6 dm. high, glabrous 

 or somewhat glandular-pubescent, the dilated bases of the peti- 

 oles with brown bristly hairs, otherwise smooth or nearly so ; 

 leaves thin membranous, 5-7 cm. broad, deeply 5-7-lobed; calyx- 

 lobes lanceolate-triangular, often slightly toothed above; tube 

 oval, urceolate in fruit; petals cuneate-elliptic, obtuse, 3.5 mrn. 

 long, much exceeding the calyx-lobes; claw very short. (Boy- 

 kinia occidentalis T. & G.) 



Topango Canyon, Davidson. 



2. T. rotundifolium (Parry) Wheelock. Stem villous-pubes- 

 cent and glandular, 4-8 dm. high, leafy; leaves 5-10 cm. broad, 



