SAXIFRAGACEAE. 127 



ot the leaves puberulent; leaves orbicular, somewhat 3-5-lobed, crenate- 

 dentate, rounded or subcordate at base, about 1 cm. long; petioles mostly 

 shorter than the leaves; pedicels very short; racemes short, dense, 3-5-flowered, 

 drooping; calyx white, cylindric, 6-8 mm. long, glandular, the short lobes 

 obtuse; petals orbicular; berry orange-red, insipid. On warm rocky hillsides. 



Ribes viscosissimum Pursh. Unarmed, about 1 m. high, pubescent 

 throughout and somewhat glandular; leaves cordate-orbicular, obtusely 

 5-lobed, somewhat doubly dentate, soft-pubescent, especially beneath, 2-5 

 cm. broad; petioles about as long as the blades, hirsute-glandular; raceme 

 ascending, shorter than the leaves; bracts oblong or obovate, obtuse, conspic- 

 uous; flowers whitish or purplish, about 10 mm. long, on short pedicels which 

 become slender and elongate in fruit; calyx-tube campanulate, becoming cy- 

 lindric, the erect lobes acute, shorter; petals small, white; berry black, rather 

 dry. In mountain woods. 



178. PHILADELPHIA. 



Shrubs; leaves opposite, petioled, entire or toothed, ovate or 

 oblong, without stipules; flowers large, showy, white, solitary or 

 cymose-clustered ; calyx-tube top-shaped, 4- or 5-lobed, adherent 

 to the ovary nearly or quite to its summit ; petals 4 or 5, large, obo- 

 vate or roundish; stamens 20-40, on the disk; styles 3-5, more or 

 less united; ovary 3-5-celled, inferior; ovules numerous; capsule 

 3-5-valved; seeds very numerous. 



Philadelphus lewisii Pursh. Syringa. Shrubs 1-3 m. high, much branched 

 above; leaves ovate, acute or acuminate, entire or sparingly dentate, glabrous 

 or nearly so, 2-4 cm. long; petioles short; panicles narrow, few-flowered, 5-10 

 cm. long; calyx-lobes acute or acuminate, twice as long as the tube, densely 

 pubescent at the tips within; petals oblong, 1.5-2 cm. long; styles united for 

 half their length or rarely more; stigmas narrow. A handsome shrub, the 

 flowers odorous. 



179. SAXIFRAGA. Saxifrage. 



Chiefly perennial herbs; stem short or none; radical leaves 

 tufted; cauline mostly alternate; flowers perfect, solitary or in 

 cymes or cymose panicles; calyx 5-lobed, free or adhering to the 

 base of the ovary; petals 5, entire, perigynous; stamens 10, 

 perigynous; carpels 2, nearly distinct or uniting into a 2-celled 

 ovary; placentae axile; styles distinct; capsules 2-beaked, 2- 

 celled, sometimes two almost separate follicles. 



Leaves coarsely toothed, cordate, long- petioled. 



Caudex bulbous; herbage somewhat glandular; leaves 



doubly dentate. S. mertensiana. 



Caudex not bulbous; herbage glabrous; leaves simply 



dentate. S. odontoloma. 



Leaves not coarsely toothed, not cordate, short-petioled. 



Filaments broadest at top. S. saximontana. 



Filaments broadest at base. 



Petals longer than the sepals. S. fragosa. 



Petals shorter than the sepals. 



Petals oblong. S. columbiana. 



Petals obovate. 5. planlaginea. 



