178 HEXANDEIA TKIGYNIA. [cL. VI. 



shaped, 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 stalked: flowers 

 in distant whorls. Perennial : flowers in July and August : grows 

 in marshes, ditches, and boggy grounds : common. Eng. JBot. vol. 

 xxvii. pi. 1932. Eng.Fl. vol. ii. p. 113. 564. 



10. R. obtusifolius. 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 troublesome weed. Perennial : flowers in July and 

 August : grows about houses, in waste places and fields : common. 

 Eng. Sot. vol. xxviii. pi. 1999. Eng. Fl. vol. ii. p. 192. 565. 



11. R. Hydroldpathum. 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 by rivers : frequent. 

 Eng. Bot. vol. xxx. pL 2104. Eng. FL vol. ii. p. 195. 566. 



** Stameniferous flower* and pistilliferousfloicers> on separate plants. 



12. R. Acetosa. Common Sorrel. Enlarged petals bearing tu- 

 bercles ; leaves oblong, arrow-shaped. Stem from one to two 



feet high, erect, hollow, striated, leafy. The whole plant is power- 

 fully acid, and the leaves are eaten as salad. Perennial : flowers 

 in the summer months : grows 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. Acetosella. Sheep' s Sorrel. Enlarged petals destitute of 



tubercles : leaves halbert-shaped. Stem from jfour 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 co- 

 rolla; anthers heart-shaped, fixed sidewise. Germen three- 

 cornered. Styles awl-shaped, spreading ; stigmas knobbed. 

 Capsules three, connected at the base, each one -celled, two- 

 valved. Seeds numerous, oblong, angular. Named after Mr. 

 Tofeld, an English botanist. 201. 



1 . T. palustris. Scottish Asphodel. Flowers in an egg-shaped 

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

 shaped ; germens roundish. Leaves sword-shaped, in two-rowed 



tufts : stem four or five inches high : flowers greenish-white. Pe- 

 rennial : flowers in August : grows in boggy places, on the moun- 



