280 LXV. SAXIFRAGACE^:. TIARELLA. 



rolla inferior, of 5 small, entire petals, inserted with the 5 stamens 

 on the throat of the calyx ; capsule 1 -celled, 2-beaked, many-seeded. 

 % Lvs. radical^ long-petioled. 



1. H. AMERICANA. Alum-root. 



Viscid-pubescent; Ivs. roundish, cordate, somewhat 7-lobed, lobes short 

 and roundish, crenate-dentate, teeth mucronate ; -panicle elongated, loose ; pedi- 

 cels divaricate ; cal. short, obtuse ; pet. spatulate, about as long as the calyx ; 

 sta. much exserted. A neat plant, rare in the southern parts of N. Eng. and 

 N. Y., frequent at the W. ! and S. Leaves all radical, 2 3' diam., on peti- 

 oles 2 8' in length. Scape 2 4f high, paniculate, nearly | this length. Pe- 

 duncles 2 3-flowered. Calyx campanulate, more conspicuous than the purplish- 

 white petals. May, Jn. Root astringent, hence the common name. 



2. H. PUBESCENS. Ph. (H. grandiflora. Raf.} 



Scape naked, minutely-pubescent above, and with the long petioles, gla- 

 brous below; ITS. glabrous, orbicular-cordate, 7 9-lobed, lobes rounded, and 

 with rounded, mucronate, eiliate teeth ; ped. cymose, dichotomous, joints flexu- 

 ous, almost geniculate ; fls. large ; pet. longer "than the included stamens ; sty. 

 exserted. Mts. Penn., Md ! Va. Scape 1 2f high. Leaves 3 5' diam., the 

 veins beneath with a few scattered hairs. Flowers 5 6" long, purple. May, Jn. 



3. H. RICHARDSONI. R. Br. 



Scape (naked) and petioles hairy and rough ; Ivs. orbicular-cordate, with 

 a deep sinus, 5 7-lobed, lobes obtuse, incisely crenate, ciliate ; panicle rather 

 contracted ; cal. somewhat oblique ; pet. ciliolate, somewhat unequal, about the 

 length of the sepals; sta. a little exserted; sty. included. Prairies and bottoms, 

 la. ! to Mo., N. to Can. Scape 1 2f high. ' Leaves glabrous above, veins be- 

 neath hairy. Flowers 6 7" long. May. 



4, MITEL LA. Tourn. 



A Lat. diminutive from mitra, a mitre. See Tiarella. 



Calyx 5-cleft, campanulate; petals 5, pectinately pinnatifid, insert- 

 ed on the throat of the calyx ; stamens 5 or 10, included ; styles 2, 

 short ; capsule 1 -celled, with 2 equal valves. '4- 



1. M. DIPHYLLA. Currant-leaf. Bishop's Cap. 



Lvs. cordate, acute, sublobate, serrate-dentate, radical ones on long peti- 

 oles, cauline 2, opposite, subsessile. Very common in the woods of N. Eng. to 

 Can. and Ky. Stem a foot or more high, bearing the pair of leaves near the 

 midst. Leaves 1 3' long, nearly as wide, hairy, on hispid petioles 2 6' long. 

 Flowers on short pedicels, arranged in a long, thin spike or raceme, and most 

 beautifully distinguished by the finely divided white petals. Seeds black and 

 shining. May Jn. 



2. M. NUDA. (M. prostrata, MX. M. cordifolia. Lam.') Dwarf Mitella. 

 Lvs. orbiculate-reniform, doubly crenate, with scattered hairs above ; scape 



filiform, few-flowered, naked or with a single leaf; pet. pinnatifid with filiform 

 segments. A very delicate species, growing in damp, rich, shady woodlands 

 at Potsdam, N. Y., and in Northern N. Eng. Leaves and stems light green, 

 pellucid. Scape 4 6' high, terminating in a thin raceme of white flowers, 

 with finely pinnatifid petals. They are erect or prostrate, and send out creep- 

 ing stolons from the base. Leaves ' long and of nearly the same width. Jn. 



5. TIARELLA. 



Lat. tiara, a mitre or some other head-dress, from the resemblance of the capsule. 



Calyx 5-parted, the lobes obtuse ; petals 5 ; entire, the claws in- 

 serted on the calyx ; stamens 10, exserted, inserted into the calyx ; 

 styles 2 ; capsule 1 -celled, 2-valved, one valve much larger. % Flow- 

 ers white. 



T. CORDIFOLIA. Mitre-wort. Gem-fruit. 



Lvs. cordate, acutely lobed, mucronate-dentate, pilose ; scape racemose ; 



