128 



SAXIFRAGACEJE. 



seeded placentae, 2-beaked, opening between the beaks. — 

 Perennial herbs, with round heart-shaped radical hares, and 

 greenish-ichite tinged icith purple flowers in small clusters 

 disposed in a prolonged mostly loose panicle. 



1. H. Americana, L. Alum Root. 



Hairy-pubescent and somewhat viseed ; lobes of the leaves short and rounded ; 

 panicle, loose; stamens at length much exserted. 



Rocky woodlands ; common. June, July. Scape 2 to 3 feet high, somewhat 

 elammy hairy. Lane* deeply cordate. Flowers small, in a long simple panicle. 



2. H. pubescens, Pursh. Pubescent Alum Root. 



8ca} e nake^, minutely glandular pubescent, or smooth below, often 2 to 4-leavcd ; 

 kaves orbicular-cordate ; lobes rounded, sharply-toothed, with broad pointed teeth, 

 eiliate with bristly hairs ; flowers in a contracted panicle : stamens shorter than 

 the erect lobes of the calyx. 



Mountains and hills. May, June. Scape 10 to 15 inches high, slender. Flowers 

 nearly y^ inch in length. Calyx-lobes unequal, greenish-white. Prtals yiolet-pux- 

 pla, yeiny. 



3. MITELLA. Tc-nrn. 



A diminutive of the Latin mitra, a mitre or cap ; in allusion to the form of the 

 caprule. 



Calyx short, bell-shaped, coherent with the base of the 

 ovary, 5-cleft. Petals 5, inserted into the calyx, slender, 

 pi'nnatifid. Stamens 10, included. Styles 2, very short. 

 Capsule short, 2-beaked, 1-celled, 2-yalved ; valves equal. 

 Seeds numerous. — Low and slender perennial herbs, with 

 round heart-shaped leaves on slender petioles, those of the 

 scape opposite, flowers small, greenish and white, borne in a 

 simple slender raceme or spike. 



1. M. DIPHYLLA. L. Two-leaved Bishop's- Cap. 



Radical leaves heart-shaped, acute, somewhat 3 to 5-lobed, toothed; scape leaves 

 X opposite, nearly sessile ; flowers in a terminal raceme ; petals toothed-pinnatifid. 



Hillsides and rich woods. May. Stem 8 to 12 inches high. Radical leaves on 

 long petioles. Scape many-flowerad. Flowers sniaU, white, in a raceme 4 to 8 

 tochea long. Plant hairy. Two-leaved Mitre-wort. 



2. M. NUBA, L. Heart-leaved Bishop' s-Cap. 



Stem slender; radical leaves somewhat 3-lobed, deeply and doubly-crenate; tca-pi 

 naked, or with a single leaf, few-flowered ; petals fimbriate-pinnatificL 



Deep moist woods with mosses. May— July. Scape 4 to 8 inches high, occa- 

 sionally prostrate with creeping suckers. Root-leaves on long petioles ; sttm leave* 

 much smaller and sessile. Fhjwers greenish-white, few, in a terminal spike. 



4. TIARELLA. Linn. 



A dimkiutto of the Latin tiara, a head dress: in allusion to the form of the 



capsule. 



CALYX 5-parted ; bell-shaped, nearly free from the oyary. 



