240 HEXANDRIA. TETRAGYNIA. 



spreading-, pale rose colour, undulated, obtuse, a liule 

 longer and nearly twice the bre:idtii of the calix. Germ 

 with a distinct soliiary style, as in no other species of the 

 genus, and 3 smoothish stigmas somewhat shorter than 

 the style. 



A North Anieiican genus, with the exception of T. uho- 

 vatiim, which grows also in Kamtschaika according to 

 Failas. 



S53. RUMEX. L. (Dock.) 



Calix 6 parted.. j)ersistent, the 3 interior di- 

 visions petaloid, ronnivent. Seed 1, 3-sided, su- 

 perior, naked. Stigmata nuiltifid. 



Flowers paniculate, terminal or axillary, mostly fascicti- 

 lated; in many species the petaloid segments are exter- 

 '.Yally gland uliferous. Some of the species are monoicous 

 or dioicous. 



Speoes. l.'R. savghineits. 2. cvispiis. o. verticillatus. 

 C. bntaniiiciis. 5. persicarioides. 6. crispahilvs. 7 ■ obuisi- 

 Julius. 8 aqnaticus. 9. iligynns, (Sorrel). 10. Acetosella 

 (Sheep's sorrel). Introduced j abundantly naturalized. 

 il. venf*fus. Pa. Flowers Hermapluodite, valves very 

 large, reniform-cordate, entire and witjiout glands, red; 

 leaves suboval-lanceolate, small. Uab. Near the conflu- 

 ence of the river I'laite, on the sandy bunks of the Mis- 

 souri. Flowering in April. Stem scarcely a foot high. 

 Flowers pt ndulous and fasciculated, valves about 5 lines 

 wide. It differs sulliciently from /s'. a-mcarz'ws by having 

 the petaloid valves only large; it is also perennial. 



Tl)is extensive genus of more than 40 species is almost 

 equally divided betwixt Europe and the temperate parts 

 of Africa (Baibary, Egypt and the Cape of Good Hope.) 



Order IV.— TETRAGYNIA. 



354. SAURURUS. L. (Lizard's-tail.) 



Floxvcrsin an amcnt, or crowded s])ike, scales 

 l-ll(i\vered. Corolla none. Filamenis and anthei's 

 adnate. Capsules 4, each 1 or rarely 2-seeded, 

 not opening. 



Stem leafy, many-spiked, leaves alternate cordate. 

 Species. 1. S. cenuais- A North American genus of a 

 single species. 



