Hydrophyllum. IIYDROPIIYLLACEiE. 91 



Group 10. Ovary free (superior), either compound or the carpels distinct, with 

 several or numerous (rarely solitary J ovules in each cell. Fruit capsular, 

 follicular or baccate. Corolla regular ; the stamens inserted upon its tube, as 

 many as its lobes and alternate with them. 



Order LXXIII. HYDROniYLLACEiE. R. Br. The Waterleaf Tribe. 



Calyx 5-cleft ; the sinuses often with appendages, persistent. Corolla regular, 

 usually furnished with scales or honey-bearing grooves on the inside of each 

 lobe. Stamens 5, inserted into the base of the corolla. Ovary with 2 parietal 

 placenta?, sometimes separating from the walls : styles united into one. Fruit 

 a capsule. Seeds few ; the testa crustaceous. Embryo small, in cartilaginous 

 albumen. — Herbs, often hairy, with alternate and lobed or pinnatifid leaves. 

 Flowers in cymose clusters, or in one-sided racemes. 



1. HYDROPHYLLUM. Tourn. ; E?idl. ge?i. 4827. WATER-LEAF. 



[ From the Greek, hydor, water, and phyllon, a leaf; but the allusion is not evident.] 



Calyx 5-parted ; the sinuses naked, or with small reflcxed appendages. Corolla somewhat 

 campanulate, 5-cIeft, with five longitudinal linear adnate scales inside, alternating with the 

 lobes. Stamens exserted. Ovary with two large fleshy placentfe which are attached to 

 the walls by a narrow dorsal line, each bearing two ovules on the face : style filiform : 

 stigma 2-cleft. Capsule globose, 2-valved, 4-seeded ; three of the seeds usually abortive : 

 placenta at length free, and resembling an interior pericarp. — Leaves broad, pinnately or 

 palmately lobed. Racemes corymbose, scorpioid and dichotomous. 



* Sinuses of the calyx mthout appendages. 



1. Hydrophyllum Virginicum, Li7m. Virginian Waterleaf. 



Stem smoothish ; leaves pinnately divided, the lobes oval -lanceolate, deeply serrate; 

 peduncles longer than the petioles of the upper leaves ; calyx-segments hairy-ciliate. — Linn, 

 sp. 1. p. 146 ; Lam. ill. t. 97. f. 1 ; MicJix. fl. I. p. 134 ; Pursh, /. 1. p. 134 ; Ell. sk. 1. 

 p. 232 ; Torr. Jl.l. p. 219 ; Bigel. Jl. Bost. p. 73 ; Bot. reg. t. 331 ; Beck, hot. p. 255 ; 

 Turp. atl. diet. sc. nat. 4. t. 46 ; Darlingt. jl. Cest. p. 127 ; Hook. fl. Bor.-Am. 2. p. 78. 



Perennial. Rhizoma creeping. Stems 12-18 inches high, growing in clusters, often 

 branched at the base. Leaves pinnately cut into 5-7 segments ; petioles of the lower ones 



12* 



