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, 68 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, snorter 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. PHILADELPHUS. 



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; flow r ers 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. 5. fragosa. 



Petals shorter than the sepals. 



Petals oblong. 5. Columbia na. 



Petals obovate. 5. plantaginea. 



