324 SYNGENESIA POLYGAMIA SUPERFLUA. [CL. XIX. 



on the Highland mountains: found on Ben Lawers by Mr. Dickson. 

 Eng. Bot. vol. vii. pi. 464. Eng. Fl. vol. iii. p. 423. 1 187. 



28. TUSSILA'GO. COLT'S-FOOT. 



Common calyx simple, cylindrical, with from fifteen to twenty 

 linear, erect, parallel, equal scales. Compound corolla rayed ; 

 florets of the disk tubular, with five equal segments, furnished with 

 stamens and pistils ; florets of the ray narrow, strap-shaped ; 

 anthers united or converging. Germen inversely egg-shaped, 

 short. Style thread-shaped; stigmas two, protruded, linear. 

 Seed oblong, compressed ; seed-down sessile, simple. Receptacle 

 naked. Name from tussis, cough, and ago, to expel. 393. 



1. T. Fdrfara. Coifs-foot. Scape one-flowered, imbricated with 

 scales ; leaves heart-shaped, angular, toothed, white and cottony be- 

 neath. Stalk about ten inches high, with a large bright-yellow rayed 



flower : leaves glaucous above. The downy substance of the leaves, 

 after being dipped in saltpetre, makes excellent tinder. The leaves are 

 bitter and mucilaginous, and were formerly used for coughs and pul- 

 monary complaints. Perennial : flowers in March and April : grows 

 generally in clayey soil, by rivers and ditches : common. Eng. Bot. 

 vol. vi. pi. 429. Eng. Fl. vol. iii. p. 425. 1188. 



29. PETASI'TES. BUTTEB-BUR. 



Common calyx egg-shaped, imbricated, with two rows of 

 lanceolate scales. Compound corolla with the florets all tubular, 

 furnished with stamens and pistils, some of the central ones des- 

 titute of stamens; anthers united. Germen inversely egg-shaped, 

 short. Style thread-shaped ; stigmas two, protruded, oblong. 

 Seed oblong, compressed, seldom perfected; seed-down sessile, 

 simple. Receptacle naked. Name from petasis, a covering, on 

 account of the great size of the leaves. 394. 



1. P. vulgdris. Butter-bur. Panicle dense, between egg-shaped and 

 oblong ; flowers without rays ; leaves heart-shaped, unequally toothed, 



with a lateral rib on each side at the base. Stalk about eight inches 



high, of dense, pale-purple flowers: florets generally furnished with sta- 

 mens and pistils, but rarely perfecting seeds. In a variety, known by the 

 name of T. hybrida, the florets have pistils, but seldom stamens, and pro- 

 duce perfect seeds. Leaves two or even three feet in diameter, the largest 

 of any British plant. Perennial : flowers in March and April : grows by 

 rivers and brooks, in rich soil : common. Eng. Bot. vol. vi. pi. 430 and 

 pi. 431. Eng. Fl. vol. iii. p. 426. 1 189. 



30. SENE'CIO. GROUNDSEL. RAGWORT. 



Common calyx double ; the inner cylindrical, of numerous, 

 equal, parallel, linear scales; the outer of minute imbricated scales 

 at the base of the others ; all withered-looking and generally 

 black at the tip. Compound corolla, longer than the calyx; 

 florets of the disk numerous ; all perfect, tubular, with five equal 

 segments ; those of the ray strap-shaped, slightly toothed, with- 

 out stamens, and sometimes wanting. Filaments hair-like, short ; 



