TiARELLA. SAXIFRAGACEii:. 587 



in Edinb. phil. jour. 1829. Drummondia mitelloides, DC. prod r. 4. ;>. 40, 

 excl. syn. MitcUa trifida. 



Moist alpine woods in ilip Rocky Mountains, Drummond ! — Flowers about 

 the size of those of M. nuda, greenish. 



§ 4. Stamens 5, alternate with the trifid scarcely exserled petals ; fdamenls 

 very short: calyx adherent to the middle of the ovary: stigmas somewhat 

 capitate, undivided: placentae parietal, many-ovuled : scape naked. — 

 MiTKLLiNA. (Mitcllopsis § MitcUina, Mcisn. ; Endl.) 



■ 5. M. trifida (Graham) : leaves all radieal, rordate, slightly lobed, cre- 

 nate; scape" slender, naked ; calyx canij)anulate, the lobes spreading ; petals 

 cuneiform, deeply 3-cleft. — Graham! I. c. ; Hook.! I. c. t. 82. Litho- 

 phrairnia nudicaule, Ault.! mss. 



Rockv Mountains, from near Smoking River, on the east side, in lat. 56° 

 (Drummond) to the Blue Mountains of Lewis and Clarke's River, lat. 46°. 

 {Dou<rlas.)—lIah[l whollv iliat of the preceding species. Petals scarcely 

 longer than the lobes of the calyx ; l)oth greenisii-white. — Although tlie petals 

 of tliis plant are 3-cleft, as in Lithopluagma, yet we conceive it more 

 properly placed in the present genus. 



9. TIARELLA. Linn.; Lam. ill. t. 373 ; Endl. gen. p. 816. 



Calyx campanulate, nearly free from the ovary, 5-parted ; the lobes ob- 

 tuse, valvate in estivation. Petals 5, entire. Stamens 10, inserted with the 

 petals into the base of the calyx : filaments filiform, exserted : anthers ovate, 

 2-celled. Styles 2 : stigmas simple. Capsule membranaceous, 1-celled, 

 with 2 parietal placentfe, 2-valved ; the valves very une(pial. Seeds few, near 

 tlie base of the capsule (tlie others abortive), rather large, subglobose : testa 

 crustaceous, smooth and shining.— Perennial herbs, with simple or trifolio- 

 late incised and serrate leaves. Pedicels recurved in fruit. Bracts scarcely 

 any. Flowers white. 



§ 1. Scape naked : raceme simple : petals oblong, «ng«ic«ia<e.— Eutiarella. 



-,-- 1. T. cordifolia (Linn.) : leaves cordate, acutely lobed, unequally dentate 

 ' with mucronate teeih, hirsute with scaliered hairs above, pubescent beneath ; 



stolons creeping.— L?«n. / spec 1. ;'. 405,- Lam. ill. t. 373, /. 1 ; ^]''<^'>^-- J- 



1. p. 271 ; Pursh! fl. 1. p. 313 ; Bot. mag. t. 1589 ; lorr. ! Jl. 1. p. 445 ; 



Bisel. ! ft. Bost. ed. 2. p. 178 ; DC. ! prodr. 4. p. 50. _ ^ ,.. • ■ 

 Wof)ds, Canada! to Pennsylvania! and the mountams of V irgmia. 



April-Mav.— Caudex thick, sending out creeping stolons after flowering. 



Scapes 6^12 inches high. Pedicels slender. Calyx and petals white. 



Filaments long, flattened and slightly dilated above. Seeds ovoid, brownish. 



— Mitre-ivort. 



§2. Stem leafy {leaves alternate): flowers paniculate: petals filiform or 

 ««fewZa<e.— Anthonema, Nutt. mss. (Blondia, Necker?) 



;^ 2. T. vnifoliata (Hook.): nearly glabrous; stem 1-leaved; leaves all 

 triangular-cordate, 3-5-lobed ; the lobes rather acute, obtusely serrate-toothed ; 



