SAXIl'RAGACEAE. 



Vol. 11. 



I. Saxifraga cernua L. Nodding or Drooping 

 Bulbous Saxifrage. Fig. 2166. 



Saxifraga cernua L. Sp. PI. 403. 1753. 



Stem weak, slender, ascending, pubescent but scarcely 

 glutinous, 4'-i2' long. Leaves alternate, the basal and lower 

 ones petioled, broadly reniform, palmately 5-7-lobed, usually 

 less than i' wide; upper leaves smaller, sessile, 3-lobed or 

 entire and bract-like, often bearing small bulblets in their 

 axils ; flowers 1-3, terminal, nodding, white, 8"-io" broad ; 

 petals obovate, sometimes retnse. 3-4 times as long as the 

 ovate calyx-lobes. 



Newfoundland, Labrador, and through arctic America to 

 Alaska. Also in arctic and alpine Europe and Asia. Summer. 



2. Saxifraga rivularis L. Alpine Brook Saxifrage. 

 Fig. 2167. 



Saxifraga rivularis L. Sp. PI, 404. 1753- 



Densely tufted, glabrous or sparingly pubescent, tnatted, 

 i'-3' high. Leaves alternate, the basal and lower ones 

 slender-petioled, reniform, 3-5-lobed, seldom more than 3" 

 wide; petioles dilated at the base; upper leaves lanceolate 

 or ovate, entire or slightly lobed, mainly sessile ; flowers 

 i-S, terminal, erect, white, about 3"-5" broad ; calyx-lobes 

 ovate, obtuse, slightly sliorter than the ovate-oblong petals; 

 tips of the capsule widely divergent, its base adnate to 

 the calyx. 



Alpine summits of the White Mountains, Labrador, arctic 

 .America and south in the Rocky Mountains to Colorado. Also 

 in arctic and alpine Europe and Asia. Summer. 



7. MUSCARIA Haw. Saxifr. Enum. 36. 1821. 



Perennial low herbs, with densely tufted or matted copiously leafy caudices, sparingly 

 leafy dower-stems, and alternate, 3-lobed or rarely 5-7-lobed leaves, the flowers solitary or 

 few together in terminal cyines. Sepals 5, erect. Corolla white, regular, the petals relatively 

 broad, clawless. Stamens 10; filaments subulate. Ovary about one-half inferior, the carpels 

 united to above the middle. Follicles erect, except the sometimes slightly spreading tips, 

 mostly included in the calyx-tnbe. [Latin, referring to the moss-like growth of the plants.] 



About 35 species, most abundant on high mountains and in boreal regions. Type species : 

 Saxifraga muscoidcs Wulf. 



I. Muscariacaespitosa (L.) Haw. Tufted Saxifrage. 

 Fig. 2168. 



Saxifraga caesl^ilosa L. Sp. PI. 404. 1753. 



Muscaria caespitosa Haw. Saxifr. Enum, ^y. 1821. 



Densely tufted, leaves clustered at the base, spatulate or 

 fan-shaped. i"-g" long, deeply 3-5-cleft or lobed into linear 

 obtuse segments, glabrous ; flowering stem erect, 2'-8' high, 

 viscid-pubescent, at least above, linear-bracted or wdth several 

 3-lobed leaves; flowers 1-8, corymbose, 4"-7" broad, white: 

 caly.x-lobes ovate-oblong, obtuse or obtusish, much shorter 

 than the obovate petals; capsule-tips divergent; base of the 

 capsule adnate to the calyx. 



On rocks, Quebec. Labrador and Newfoundland, west through 

 arctic .\merica to Alaska, south to Oregon and in the Rocky 

 Mountains to Colorado, Also in arctic and alpine Europe and 

 Siberia. Summer. 



