154 SAXIFRAGACEiE. (SAXIFRAGE FAMILY.) 



5. ASTILBE, Hamilton. 



Flowers polygamo-dioecious. Calyx eampanulate, 5-parted, nearly free from 

 the ovary. Petals 5, spatulate, withering-persistent. Stamens 10, exsertcd. 

 Styles 2. Capsule 2-celled, few-seeded. Seed-eoat loose and thin. — Perennial 

 herbs, with ternately compound leaves, and small yellowish-white flowers, in 

 panicled racemes. 



1. A. decandra, Don. — Banks of streams among the mountains of 

 Georgia and North Carolina. June - August. — Stem 3° - 5° high. Leaves 

 twice or thrice ternately compound ; the leaflets mostly cordate-ovate, sharply 

 lobed and toothed. Stigmas of the sterile flowers and the stamens and petals of 

 the fertile ones smaller or rudimentary. 



6. TIARELLA, L. False Mitre-wort. 



Calyx eampanulate, nearly free from the ovary, 5-parted. Petals 5, entire. 

 Stamens 10. Styles 2. Capsule membranaceous, 2-valved, the valves very un- 

 equal, 1 -celled, few-seeded. Seeds globular, smooth. — Perennial herbs, with 

 scape-like stems, chiefly radical and petiolcd leaves, and small racemose flowers. 



1 • T. COl'difolia, L. Leaves round-cordate, crenately or acutely lobed 

 and toothed, hairy above, pubescent beneath, on long hairy petioles ; scape (C- 

 12' high) naked, or bearing 1-2 alternate leaves above the middle; racemes 

 simple or branched, many-flowered ; petals oblong, white or purplish. — Rocky 

 woods and banks, Mississippi, and northward along the mountains. April 

 and May. 



7. MITELLA, Tourn. Mitre-wort. 



Calyx coherent with the base of the ovary, 5-cleft. Petals 5, pinnatifid. Sta- 

 mens 10. Styles 2. Capsule 2-beaked, 1-cclled, 2-valved at the apex, many- 

 seeded. Seeds smooth, borne on two parietal placentae. — Perennial herbs, with 

 broadly cordate and lobed leaves, and small flowers in a terminal raceme. 



1 . M. diphylla, L. Hairy ; radical leaves cordate, acute, coarsely ser- 

 rate and slightly 3-lobed, on long petioles; stem-leaves 2, opposite, sessile; 

 raceme slender, loosely many-flowered. — Shady woods, on the mountains of 

 North Carolina, and northward. May. — Stem C - 12' high. Flowers white. 



8. CHRYSOSPLENIUM, Tourn. Golden Saxifrage. 



Calyx-tube coherent with the ovary, 4-5-lobed ; the lubes obtuse and yellow 

 within. Petals none Stamens B-10, very short, inserted <>n a conspicuous 

 disk. Styles -j. Capsnle very short, 2-lobed, I -celled, with 9 parietal placentas, 

 2-valved al the apex, many-seeded: — Smooth and Bucculont herbs, with round* 



[sh leaves, and axillary (lowers. 



l. C. Amoricanum, Sehweinit/.. Stems prostrate, forking; leaves mostly 



opposite, roundish, slightly lobed; flowers solitary, greenish. — Cold and shady 



