SAXIFRAGACEdS. (SAXIFRAGE FAMILY.) 143 



* # Stt vs ascending, leafy : stem-leaves alternate : calyx coherent beloic ivith the pod. 



2. S. rivularis, L. (Alpine Brook Saxifrage.) Small ; stems 

 weak, 3 - 5-flowered ; lower leaves rounded, 3 - b-lobcd, on slender petioles, the 

 upper lanceolate; petals white, ovate. — Alpine region of Mount "Washington, 

 New Hampshire, Oakes. Very rare. (Eu.) 



3. S. aizoides, L. (Yellow Mountain Saxifrage.) Low(3'-5' 

 high), in tufts, with few or several corymbose flowers; leaves linear-lanceolate, 

 sntire, fleshy; spinulose-ciliate ; petals yellow, spotted with orange, oblong. — WH- 

 loughby Mountain, Vermont; near Oneida Lake, New York; X. Michigan; 



and northward. June. (Eu.) 



4. S. tricuspid uta, Retz. Stems tufted (4'-S' high), naked above; 

 flowers corymbose; leaves oblong or spatulatc, with 3 rigid pointed teeth at the sum- 

 mit ; petals obovate-oblong, yellow. — Shore of L. Superior and northward. ( Eu . ) 



* * Leaves clustered at the root : scape many-flowered, erect, clamjny-pubescent. 



5. S. Aizoon, Jacq. Leaves persistent, thick, spatulate, with white cartilagi- 

 nous toothed margins ; calyx partly adherent ; petals obovate, cream-color, often 



spotted at the base. — Moist rocks, Upper Michigan and Wisconsin; Wil- 

 loughby Mountain (Mr. Blake), and northward. — Scape 5' -10' high. (Eu.) 



6. S. Yirgiasiciisis, Mkhx. (Early Saxifrage.) Low (4' -9 

 high) ; leaves obovate or oval-spatxdate, narrowed into a broad petiole, crenatc- 

 toothed, thick ish ; flowers in a clustered cyme, which is at length open and loose- 

 ly panieled ; lobes of the nearly free calyx erect, not half the length "/the oblong 

 obtuse (white) petals ; pods 2, united merely at the base, divergent, purplish. — 

 Exposed rocks ; common, especially northward. April -June. 



7. S. Pcnusylv.eiiica, L. (Swamp Saxifrage.) Larue (l°-2° 

 high); leaves oblanceolate, obscurely toothed (4'- 8' long), narrowed at the base 

 into a short and broad petiole; cymes in a large oblong panicle, at first clus- 

 tered; lobes of the nearly free calyx recurved, about the length of the linear-lanceo- 

 late (•greenish) small petals ; filaments awl-shaped: pods at length divergent. — 

 Bogs, common, especially northward. May, June. — A homely species. 



8. S. crosa, Pursb. (Lettuce Saxifragk.) Leaves oblong or oblanceo- 

 late, obtuse, sharply toothed, tapering into a margined petiole (8' -12' long) ; scape 

 slender (l°-3° high); panicle elongated, loosely flowered, pedicels slender; 

 calyx reflexed, entirely free, nearly as long as the oval obtuse (white) petals; filaments 

 club-shaped ; pods 2, nearly separate, diverging. — Cold mountain brooks, Penn. 

 eylvania (near Bethlehem, Mr. Wollc), and throughout the Alleghanies south- 

 ward. June. See Addend. 



S. leucanthemifolia, Michx., S. Careyaxa, Gray, and S. Carolini- 

 Ana, Gray, of the mountains of Carolina, may occur in those of Virginia. 



3. BOYKI1VIA, Nutt. Boykinia. 



Calyx-tube top-shaped, coherent with the 2-celled and 2-beaked pod. Sta- 

 mens 5, as many as the deciduous petals. Otherwise as in Saxifraga. — Peren- 

 nial herbs, with alternate palmately 5 - 7-lobed or cut petioled leaves, and white 

 flowers in cymes. (Dedicated to the late Dr. Boy/an of Georgia I 



