280 LXV. SAXIFRAGACE^. Tiarella. 



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

 on the throat of the calyx ; capsule I -celled, 2-bealied, many-seeded. 

 — % ZiVS. radical, l-ong-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 cal)^x ; 

 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, 3— 3i' diam., on peti- 

 oles 3-— 8' in length. Scape 2 — 4f high, paniculate, nearly 5 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, aiid with the long petioles, gla- 

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

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

 ous, almost geniculate ; fls. lar^e ; 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. RiCHARDsoNr. R. Br. 



Scape (naked) and petioles hairy and rough ; Irs. 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 

 .ength 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, MITELLA. 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. — % 



1. M. DiPHYLLA. Cnrr ant-leaf. Bislwp'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 hi.spid 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. NDDA. (M. prostrata, M.x. M. cordifolia. Lam.) Dwarf Mitella. 

 Lis. 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 f ' 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. Mitrc-icort. Gem-fruif. 



I/vs. cordate, acutely lobed, mucrbnate-dentate, pilose ; scape racemose ; 



