168 CALYCANTHACE^. (CALYCANTHUS FAMILY.) 



2. C. Isevigatus, Willd. Leaves oblong, thin, either hlunt or taper-pointed, 

 bright green and glabrous or nearly so on both sides, or rather pale beneath ; 

 flowers smaller. Mountains of Franklin Co., Penn. (Prof. Porter), and south- 

 ward along the Alleghanies. May - Aug. 



3. C. glatlCUS, Willd. Leaves oblong-ovate or ovate-lanceolate, conspicu- 

 ously ta[>er-pomted,glaucous-ichite beneath, roughish above, glabrous, large (4 - 7' 

 long) , probably a variety of the preceding. Virginia (?) near the mountains 

 and southward. May - Aug. 



ORDER 35. SAXIFKAGACE^E. (SAXIFRAGE FAMILY.) 



Herbs or shrubs, of various aspect, distinguishable from Rosaceae by hac- 

 ing copious albumen in the seeds, opposite as well as alternate leaves, and 

 usually no stipules , the stamens mostly definite, and the carpels commonly 

 fewer than the sepals, either separate or partly so, or all combined into 

 one compound pistil. Calyx either free or adherent, usually persistent 

 or withering away. Stamens and petals almost always inserted on the 

 calyx. Ovules anatropous. 



Tribe I SAXIFRAGES. Herbs. Leaves alternate (rarely opposite in n. 2 and 6). 



Fruit dry, eapsular or follicular, the styles or tips of the carpels distinct. 



Ovary 2- (rarely 3-) celled with axile placentas, or of as many nearly distinct carpels. 



1. Astilbe. Flowers polygamous, panicled. Stamens (8 or 10) twice as many as the small 



petals. Seeds few. Leaves decompound. 



2. Saxifraga. Flowers perfect. Petals 5. Stamens 10. Seeds numerous, with a close coat. 



3. Boykinia. Flowers perfect. Stamens only as many as the petals, which are convolute 



in the bud and deciduous Calyx-tube adherent to the ovary. Seed-coat close. 



4. SuIIivantia. Flowers perfect. Stamens 5. Calyx nearly free. Seeds wing-margined. 

 * * Ovary 1-celled, with 2 parietal placentas alternate with the stigmas. Sterile stamens none. 



5. Tiarella. Calyx nearly free from the slender ovary. Petals entire. Stamens 10. Pla- 



centas nearly basal. 



6. Mitella. Calyx partly cohering with the depressed ovary. Petals small, pinnatifid. 



Stamens 10. 



7. Heuchera. Calyx bell-shaped, coherent with the ovary below. Petals small, entire. 



Stamens 5. 

 8 Chrysosplenium. Calyx-tube coherent with the ovary. Petals none. Stamens 10. 



* Ovary 1-celled, with 3-4 parietal placentas opposite the sessile stigmas. A cluster of 

 united sterile filaments at the base of each petal. 



9. I'arnassia. Sepals, petals and proper stamens 5. Peduncle scape-like, 1-flowered. 



Tribe II. HYDRANGEA. Shrubs. Leaves opposite, simple Ovary 2 - 5-celled ; 

 the calyx coherent at least with its base,. Fruit eapsular. 



* Stamens 8 or 10. 



10. Hydrangea. Calyx-lobes minute in complete flowers. Petals valvate in the bud. 



* * Stamens 20-40. 



11. Decumaria. Calyx-lobes small. Petals 7 - 10, valvate in the bud. Filaments subu- 



late. Style 1. 



12. Pliiladelphus. Calyx-lobes conspicuous. Petals 4-5, convolute in the bud. Fila- 



ments linear. Styles Z - 5 



Tribe III. ESCALL-ONIE^E. Shrubs. Leaves alternate and simple. Ovary 2-5- 

 celled. Fruit eapsular. 



13 Itea. Calyx 5-cleft, free from the 2-celled ovary, which becomes a septicidal capsule. 



