SAXIFRIGACEJE. 151 HYDRANGEA. 



T. cordifo'lia. 



Leorcs cordate, acutely lobed, toothed; teelh mucronate ; 5Cfl;?c racemose ; 

 stolons creepinsf. A commoa plant in the woods of N. H., where it is often 

 associated with the Mltclla dipliylla, which plant in its general aspect, it much 

 resembles. The scape arises from creeping' root-stalks about 10 inches high, 

 often bearing a leaf Leaves hairy, on long, hairy petioles. Flowers in an 

 elongated raceme, entirely white, with minute bracts. May. Jn. 



Heart-leaved Tiarella. 



5. MITE'LLA. 

 Calyx 5-cleft; petals 5, pinnatifid, inserted on the calyx j 

 stamens 5 or 10; capsule l-celled, with 2 equal valves. 



Lat. mitra, a mitre, so named for the same reason as the last genus, which 

 it much resembles both in appearance and liabils. Cal. inferior, campanulate, 

 cleft half down. Pet. twice as long as the cal. each in many capillary seg, 

 Fil. shorter than cor. Styles very short. — Perennial herbs. 



1, M. diphy'lla. 



Leaves cordate, sublobate, toothed; stem 2-leaved. Very common in N. 

 England, and frequenting the same situations as the foregoing. The stem 

 arises a foot or more, bearing near the midst, two opposite, ovate, lobed and 

 toothed leaves. Radical leaves hairy, on long, hairy petioles. Flowers on 

 short pedicels, arranged in a long, terminal, thin spike, and most beautifully 

 distinguished by the pectinately pinnatifid while petals. Seeds black, shining. 

 Woods. May. June. Two-leaved Mitella . 



2. M. NUDA. L. M. prostrata. Mx. M. cordifolia. Lam. 



Leaves orbiculate reniform, doubly cienate, with scattered hairs above; 

 scape filiform, few-flowered, naked or with a single leaf; petals pinnatifid with 

 filiform segments. A very delicate species, growing in damp, rich, shadj 

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

 lijrht green, pellucid. Scape 4 — 6 inches high, terminating in a thin raceme 

 of white flowers, with finely pinnatifid petals. They are erect or prostrate, 

 and send out creeping stolons from the base. Leaves | inch long and of near- 

 ly the same width. June. Dwarf Mltelia. 



Suborder II, HYDRANGEA. 



Petals valvate in astivation. Capsules 2-ceUed. Leaves opposite and loithout 

 stipules. Shrubs. 



G. HYDRA'NGEA. 



Calyx 4 — o-toothed, hemispherical, persistent; petals ovate, 

 sessile; stamens twice as many as petals; capsule 2-beaked, 

 opening by a foramen between the beaks. Marginal flowers 

 commonly sterile, with a flat, 4 or 5-cleft, broad, colored calyx. 



Gr. voeoQj water, ayyioi/, a vessel ; because the cultivated species require 

 60 copious a su])ply of water. Petals, stamens and pistils in the barren flow- 

 ers, either rudimentary or 0. 



