X 



566 SAXIFUAGACEjE. Saxifraga. 



Arctic America ! from Greenland to Kotzebue's Sound. /?. Arctic Isl- 

 ands. — Flowers white, rather large. 



10. S. exarata (Villars) : cscspitose ; leaves 3-5-cleft, the uppermost lin- 

 ear and entire, glandularly pubescent ; segments linear, rather acute ; flow- 

 ering stems slender, with a few scattered leaves, 3-5-flowered ; flowers 

 (small, white) in corymbose racemes ; tube of the calyx adherent to the 

 ovary ; petals obovate, 3-nerved, scarcely twice the length of the calyx. 

 Hook.— Vill. Dauph. 3. p- 674, t. 4; Don, I. c. ; Seringe .' in DC. prodr. 

 I. c. S. nervosa, Lapeyr. Saxifr. t. 39. S. pubescens, Sternb. in Linnaa, 

 6. p. 5561 



Rocky Mountains between lat. 52° & 56°, Drummond ! 



11. S. sileniflora (Sternb.) : stems caespitose, sometimes producing short 

 stolons ; leaves in dense rosulate tufts, rigid, shining as if varnished, many- 

 nerved, puberulent, 3-7-cleft; the segments linear, rather acute; flowermg 

 stems elongated, glandularly puberulent, paniculate at the summit, 2-3- 

 flowered ; flowers rather large (white) ; tube of the calyx glandularly pu- 

 berulent, adherent to the ovary ; the segments much shorter than the obovate 

 3-nerved petals. — Sternb. ! in Linnaa, 6. p. 567 ; Cham. ! I. c. ; Hook. ! fi. 

 Bar- Am. 1. p. 245. S. hypnoides /?. condensata (in part) Seringe? 



0. uniflora [Hook. \ I.e.): stems elongated, 1-flowered. — S. csespitosa /?. 

 uniflora. Hook. 8c Am. ! bot. Beechey,p. 123. 



y. minor (Presl ! mss.) : stems very short, 2-3-flowered. 



UnalaschkaandBayofEschscholtz, Chamisso! Behring's Straits, Menzies. 

 p. Kotzebue's Sound! y. Unalaschka, Hanke! — Flowering stems strict, 

 about 5 inches high, nearly naked, or with a few very small leaves ;_ the 

 uppermost simple, the lower ones 3-4-cleft. Seeds oblong, faintly striate, 

 the striffi minutely papillose. 



§ 4. Caudex perennial, leafy: leaves persistent, the margins cartilaginous 

 and with a line of impressed dots: flowering stems annual, the leaves alter- 

 nate : sepals coherent at the base, adherent to the base of the ovary : fila- 

 ments subulate. — Aizoonia, Tausch. 



12. S. Aizoon (Jacq.) : peduncles and calyx viscid with glandular hairs ; 

 leaves rosulate, spatulate, obtuse, with white cartilaginous teeth ; flowers 

 corymbose-paniculate ; segments of the calyx broad, as long as the hemi- 

 spherical tube ; petals obovate, contiguous, usually spotted with red or yellow 

 at the base ; styles divergent, longer than the calyx ; seeds ovate-triquetrous, 

 rugose-punctate. Seringe.— Jacq. fl. Austr. 5. t. 438 ; Pursh,fl. 1. p. 310; 

 Sternb. rev. Saxifr. t. 3; Don, I. c. ; Seringe! in DC. I. c. ; Hook..' fl. 

 Bor.-Am. 1. p. 243. Chondrosea Aizoon, Haw. 



Greenland, Labrador! & Nova Scotia to the Saskatchawan, Richardson! 

 8(V. Also on shady moist rocks, southern shore of Lake Superior, Dr. 

 Pitcher ! July.— Stems 5-10 inches high. Cauline leaves few and short, 

 obovate. Flowers white. 



13. S. serpyllifolia (Pursh) : shoots creeping ; leaves rosulate, imbricated, 

 ' somewhat reflexed, oblong, obtuse, coriaceous, very smooth, attenuated into 



a petiole ; stem filiform, few-leaved, glandularly pubescent, one-flowered ; 

 calyx not adherent to the ovary, the segments obtuse ; petals broadly obovate, 

 about 3-nerved. Hook.—Pivrsh! fl. 1. p. 310 ; Dm! Saxifr. I. c. p. 4 05 ; 

 DC. I. c. ; Hook. fl. Bor.-Am. 1. p. 243. S. Fischeri, Seringe! in DC. 

 prodr. 4. p. 22. S. planifolia, Sternb. in Linncea, 6. p. 555, ex Cham. 



N. W. Coast, at Cape Newnham, Nelson! and Behring's Straits, Men- 

 zies. Unalaschka and Island of St. Lawrence, Chamisso .'—'' A singular 



