ORDER 45. SAXIFRAGACE^E. 113 



L SAXIFRAGES. Herbs. Stipules none or adnate. Petals imbricate, rarely 

 convolute in the bud. Calyx free or partly adherent. . .(a) 



a Petals wanting. Ovary adherent, 1-celled. Stamens 10 CHRYSOSPLBXICM. 



a Petals pinnatifid. Ovary half adherent, 1-celled. Stamens 5 or 10 MITKLLA. 



a Petals entire. d Stam. 10. Ovary 1-celled, nearly free TIARELLA. 



e Ovary 2-celled. Fls. perfect. Lvs. simple SAXIFRAGA. 



Ovary 2-celled. Fls. poly g. Lvs. compound... ASTILBE. 



d Stam. 5. / Ovary 2-celled, adherent. Seed rough BOYKIXIA. 6 



/ Ovary 2-celled, free. Seed wing-margined SULLIVANTIA. 7 



/ Ovary 1-celled. # Styles and carpels 2 HEUCIIERA. 8 



<7 Styles and carpels 5 LEPUROPETALON. 9 



-g Stigmas and carpels 4 PARXASSIA. 10 



D ESCALLONIE^E. Shrubs with alternate leaves, no stipules, and a valvate corolla bud. . .(6) 



b Calyx free from the 2-celled ovary. Stamens 5. Capsule GO -seeded ITEA. 11 



6 Calyx adherent to the ovary. Stam. 5. Berry 00 -seeded. (From S. Am.) ESCALLONIA. 12 



HI. HYDRANGEA. Shrubs with opposite, simple leaves, and no stipules. . .(c) 



c Corolla valvate in the bud. A Cymes radiate. Shrub erect HYDRANGEA. 13 



h Cymes naked. Shrub climbing DECUMARIA. 14 



e Corolla convolute in the bud. k Stamens 20 iO Petals 4 PHILADELPHIA. 15 



Jc Stamens 10. Petals 5. (Asiatic) DEUTZIA. 16 



IV. RIBESIE^E. Shrubs with alternate, palmately-lobed leaves, and baccate fr. . .RIBES. 17 



1. CHRYSOSPLENIUM, Tourn. WATER CARPET. Calyx adnate 

 to the ovary, 4-5-lobed, colored inside. Cor. 0. Sta. 8 10, short. Sty. 2. 

 Caps, obcordate, 1-celled, 2-valved, many-seeded. ? Prostrate, small. 



C. Americanum Schw. Lvs. opposite, roundish, slightly crenate, tapering to the 

 petiole ; cal. 4-cleft. Cool springs, Northward. 3 e 7 . Calyx yellowish. Apr. May. 



2. MITELLA, Toum. MITRE-WORT. Calyx 5-cleft, adherent to the 

 base of the ovary. Pet. 5, pectinately pinnatifid, inserted on the throat of 

 the calyx. Sta. 5 or 10, included. Sty. 2, short. Caps. 2-beaked, 1-celled, 

 with two equal valves. H Flowers small, in a slender raceme or spike. 



1 M. dipliylla L. Lvs. cordate, acute, sublobate, serrate-dentate, radical ones on 



long petioles, the cauliue 2, opposite, subsessile ; fls. white, in a long, loose spike. 

 Woods, N. Eng. to Car. If. May, June. Curious. 



2 in. nuda L. Lvs. orbicular-reniform, doubly crenate, with scattered hairs above ; 



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

 segments. Damp woods, N. Eng. N. Y. : rare. G 7 . Very delicate. June. 



3. TIARELLA, L. BISHOP'S CAP. Calyx 5-parted, the lobes obtuse 

 Pet. 5, entire, the claws inserted on the calyx. Sta. 10, exserted, inserted 

 into the calyx. Sty. 2. Caps. 1-celled, 2-valved, one valve much larger. 

 If Flowers white. 



T. cordifolia L. Lvs. cordate, acutely lobed, mucronate-dentate, pilous ; scape ra- 

 cemous ; stolons creeping. Rocky woods, Can. to Ga. Common North. If. 



4. SAXIFRAGA, L. SAXIFRAGE. Sep. 5, more or less united, often 

 adnate to the base of the ovary. Pet. 5, entire, inserted on the tube of the 

 calyx. Sta. 10. Anth. 2-celled, with longitudinal dehiscence. Caps, of 

 2 connate carpels, opening between the 2 diverging, acuminate beaks 

 (styles). Seeds GO. U 



Leaves opposite (small) on the prostrate stem. Flowers purplish No. 1 



$ Leaves alternate on the ascending stem. Flowers yellow or white Nos. 2, 3, 4 



5 Leaves rosulate at the baee of the mostly leafless scape. . .(a) 



