356 CONTEIBUTIO:NiS FROM THE NATIONAL HERBARIUM. 



Leaves toothed or lobed. 

 Stems leafy. 

 Leaves longer than broad, 3-tootlied or with 3 narrow lobes. 



Basal leaves entire or 3-toothed 3. S. adscendens. 



Basal leaves deeply 3-lobed 4. S. caespitosa. 



Leaves as broad as long or broader, with 3 or more broad lobes. 



Flowers, except the uppermost one, replaced by bulblets; stems finely and 



densely viscid-hairy 5. S. cernua. 



Flowers not replaced by bulblets; stems nearly glabrous .... 6. S. rivularis. 

 Stems naked . 

 Leaves and petioles glabrous. 



Leaves as broad as long or broader, somewhat cordate at base ... 7. S. arguta. 



Leaves mostly longer than broad, narrowed at base 8. S. lyallii. 



Leaves and petioles finely or coarsely hairy. 

 Leaves kidney-shaped, as broad as long, deeply cordate at base. 



9. S. mertensiana. 

 Leaves oblong, ovate, or spatulate, longer than broad, narrowed at base. 



Flowers nearly sessile, in dense clusters, the inflorescence without bulblets. 



10. S, rhomboidea. 

 Flowers slender-stalked, in loose cymes, often replaced by bulblets. 



11. S. brunoniana. 



1. Saxifraga oppositifolia L. Purple saxifrage. On moraine at Grinnell Glacier. 

 Alaska to Wyo., Vt., and Greenl.; also in Eur. and Asia. {Antiphylla oppositifolia 

 Fourr.) Plants with leafy stems, forming dense mats; leaves obovate or spatulate, 



3 to 5 mm. long, densely crowded, hairy on the margins; flower stalks 1 to 3 cm. long, 

 1-flowered; petals 8 to 9 mm. long. 



Very showy when in flower. 



2. Saxifraga bronchialis L. Common saxifrage. Common at nearly all altitudes, 

 on open slopes or rock slides, sometimes even on prairie. Alaska to N. Mex.; also in 

 Eur. and Asia. {S. austromontana Wiegand; Leptasea austromontana Small.)— Plants 

 5 to 15 cm. high, forming dense mats; leaves lanceolate, 5 to 12 mm. long, spine- 

 tipped, hairy on the margins, crowded and overlapping; petals about 5 mm. long, 

 white; with dark red dots. 



In dry places the leaves are often purplish; they are disagreeably prickly. 



3. Saxifraga adscendens L. Frequent above timber line, on rocky slopes. B. C. 

 and Alta. to Colo.; also in Eur. {Muscaria adscendens Small.) — Plants 3 to 10 cm. 

 high, not tufted, very viscid; leaves mostly basal, 4 to 10 mm. long, wedge-shaped; 

 petals 3 mm. long, white. ^ 



An inconspicuous plant, easily overlooked . 



4. Saxifraga caespitosa L. Frequent above timber line, on rock slides or moist 

 cliffs. Alaska to Colo., Que., and Greenl.; also in Eur. {Muscaria caespitosa 

 Haw.)— Plants 2 to 10 cm. high, often matted, finely glandular-hairy; leaves 5 to 15 

 mm. long; flower stalks 1 to 3-flowered; petals 3 to 5 mm. long, white. 



6. Saxifraga cernua L. Occasional on alpine rock slides. Alaska to N. Mex., 

 Lab., and Greenl.; also in Eur. and Asia.— Stems usually solitary,, erect, 8 to 15 

 cm. high; leaves kidney-shaped, 1 to 2 cm. wide, shallowly 5 or 7-lobed; petals 

 white, 6 to 8 mm. long. 



6. Saxifraga rivularis L. Occasional above timber line, in meadows or on moist 

 cliffs. Alaska to Wyo., N. H., and Greenl.; also in Eur. and Asia.— Plants 2 to 10 

 cm. high, very slender, loosely matted; basal leaves long-petioled, kidney-shaped, 



4 to 10 mm. broad, with 3 or 5 broad lobes; petals white, 3 to 5 mm. long. 



Specimens from Sperry Glacier, reported as .S. dehilis Engelm., a closely related 

 species, are Romanzoffia sitchensis Bong. 



