980 LXV. SAXIFRAGACEiE. 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 J long-pctiolcd. 



1. H. Americana. Ahim-root. 



Viscid-pubescent; lvs. roundish, cordate, somewhat 7-lobed, loljes short 

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

 cels divaricate ; cat. 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; lvs. glabrous^ orbicular-cordate, 7 — 9-lobed, lobes rounded, and 

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

 bus, almost geniculate ; y?s. large; js-c/. 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 ; lvs. orbicular-cordate, with 

 a deep sinus, 5 — 7-lobed, lobes obtuse, incisely crenate, eiliate ; 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, MIT EL 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. — % 



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. NiDA. (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 Avhite flowers, 

 wnth finelv 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 while. 



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



ivivs. cordate, acutely lobed, mucronate-dentate, pilose; scape vdiQemose ; 



