178 HEXANDRIA TBIGYNIA. [CL. VI- 



toothed at the base, bearing a tubercle : leaves between linear and lance- 

 shaped ; whorls distant. Stem two feet high, nearly erect, branched, 



furrowed, leafy : leaves staked : flowers in distant whorls. Perennial : 

 flowers in July and August: grows in marshes, ditches, and boggy 

 grounds : common. Eng. Bat. vol. xxvii. pi. 1932. Eng. Fl. vol. ii. 

 p. 113. 564. 



10. R. obtusifiiliiu. Broad-leaved Dock. Enlarged petals toothed, one 

 principally bearing a tubercle ; root-leaves heart-shaped at the base, 



rather obtuse ; stem roughish. Stems about three feet high, erect, 



branched, furrowed, leafy : root-leaves very large, the others more 

 narrow, all notched and curled more or less at the edges. A trouble- 

 some weed. Perennial : flowers in July and August : grows about 

 houses, in waste places and fields: common. Eng. Bat. vol. xxviii. 

 pi. 1999. Eng. Fl. vol. ii. p. 192. 566. 



11. R. Hydrolapathwn. Great Water Dock. Enlarged petals egg- 

 shaped, nearly entire, unequally tubercled ; leaves lance-shaped, acute at 



both ends; whorls rather crowded, almost leafless. Stem from four to 



six feet high, erect, hollow, furrowed, branched, leafy : leaves stalked, 

 leathery, the tubercles on the petals vary in size and shape. The root 

 is highly astringent. Perennial: flowers in July and August: grows in 

 ditches and bv rivers: frequent. Eng. Bot. vol.ixi. pi. 2104. Eng. 

 Fl. vol.ii. p. 195. 566. 



** Stameniferous flowers and pistilliferousflovxrs, on separate plants. 



12. R. Acetosa. Common Sorrel. Enlarged petals bearing tubercles; 



leaves oblong, arrow-shaped. Stem from one to two feet high, erect, 



hollow, striated, leafy. The whole plant is powerfully acid, and the 

 leaves are eaten as salad. Perennial : flowers in the summer months : 

 STOWS in pastures, cultivated fields, and by roads and hedges ; abundant. 

 Eng. Bot. vol. ii. pi. 127. Eng. Fl. vol. ii. p. 196. 567. 



13. R. Acetostlla. Sheep's Sorrel. Enlarged petals destitute of tu- 

 bercles ; leaves halbert-shaped. Stem from four inches to a foot high, 



erect, leafy. The whole plant is powerfully acid, but less juicy than the 

 preceding. Perennial : flowers in the summer months : grows in pastures, 

 cultivated fields, and waste places: common. Eng. Bot. vol. xxiv. pi. 

 1674. Eng. Fl. vol.ii. p. 197. 568. 



22. TOFIEL'DIA. TOFIELDIA. 



Calyx inferior, small, of one-leaf, three-cleft, permanent. Petals 

 six, oblong, equal, permanent, many times longer than the calyx. 

 Filaments awl-shaped, simple, as long as the corolla ; anthers 

 heart-shaped, fixed sidewise. .Germen three-cornered. Style* 

 awl-shaped, spreading ; stigmas knobbed. Capsules three, con- 

 nected at the base, each one-celled, two-valved. Seeds numerous, 

 oblong, angular. Named after Mr. Tofield, an English bota- 

 nist. 201. 



1. T. palfistris. Scottish Asphodel. Flowers in an egg-shaped head ; 

 stem thread-shaped, smooth, leafless ; petals inversely egg-shaped ; ger- 



mens roundish. Leaves sword-shaped, in two-rowed tufts : stem four 



or five inches high : flowers greenish-white. Perennial : flowers in 

 August : grows in boggy places, on the mountains of Scotland, the north 



