324 SYNGENESIA POLYGAMIA SUPERFLTJA. [cL. XIX. 



July : grows on rocks on the Highland mountains : found on Beii 

 Lawers by Mr. Dickson. Eng. Bot, vol. vii. pi. 464. Eng. Fl. vol. iii. 

 p. 423. 1187. 



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, pro- 

 truded, 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 



beneath. 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 pulmonary complaints. Perennial : flowers in March 

 and April : grows generally in clayey soil, by rivers and ditches : 

 common. Eng. Bot. vol.vi. pi. 429. EngFl.\o\. iii. p. 425. 1188. 



29. PETASI'TES. BUTTER-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 

 destitute of stamens ; anthers united. Germen inversely egg- 

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

 oblong. Seed oblong, compressed, seldom perfected j 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 stamens and pistils, but rarely perfecting seeds. In 

 a variety, known by the name of T. hybrida, the florets have pistils, 

 but seldom stamens, and produce 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. 1189. 



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 gene- 

 rally black at the tip. Compound corolla, longer than the 

 calyx ; florets of the disk numerous ; all perfect, tubular, with 

 iive equal segments ; those of the ray strap -shaped, slightly 

 toothed, without stamens, and sometimes wanting. Filaments 



