392 TOKDYLIUM. [CLASS V. OKUEU II. 



GENUS LXXIV. TORDY'LIUM.— LiNxV. Hart-wort. 



Gen. Char. Calyx margin of five teeth. Petals obovate, emavginate, 

 with an inflexed point, the outer ones radiant, bifid. Fruit flat- 

 tened at the back, surrounded by a thickened often crenated 

 accessory margin. Carpels with five very slender ridges, the 

 dorsal ones equi-distaut, the lateral ones reraote,.contiguous to the 

 thickened margin, or sometimes covered over by it. Channels 

 with one to three vitta:. Albumen flattened. General and partial 

 involucre of numerous segments. — Name, according to Linna;us, 

 derived from TOfvo?, a turning lathe ; and iXKu, to turn ; from the 

 nearly orbicular seed vessels. It appears to be the ro^Ji^Xiov of 

 the Greeks. 

 1. T. max'imum, Linn. Fig. 452.) Great Hart-wort. Stem rough, 

 with reversed hairs; leaves pinnate; leaflets obtusely crenated, the 

 lower ones ovate, the upper lanceolate ; involucre shorter than the 

 umbel; fruit with a rough hairy disk, and scarcely notched hairy 

 border. 



English Botany, t. 1173. — English Flora, vol. ii. p. 105. — Hooker, 

 British Flora, vol. i. p. 136. — Lindley, Synopsis, p. 115. 



Root tapering. Stem erect, from three to four feet high, angular, 

 furrowed, clothed with rigid hairs pointed downwards, hollow, branched 

 and leafy, its branches slender, bearing numerous umbels, terminal and 

 lateral. Leaves pinnate, clothed with close pressed hairs, directed 

 towards the point of the leaf, footstalks longish, channeled above, the 

 base dilated intoa membranous striated sheath, Zeo/Zffc of the lower leaves 

 ovate, cut and obtusely serrated or crenated, those of the upper narrow- 

 lanceolate, less deeply cut and more regularly serrated, the lower pair 

 of leaflets reflexed, the upper spreading. Umbels mostly numerous, of 

 a few hairy striated more or less.unequal rays, the partial of numerous 

 short ones. General involucre of numerous narrow linear hairy seg- 

 ments, shorter than the rays, the partial about as long as the umbel- 

 lules, sometimes longer. Calyx margin of five linear teeth, the two 

 outer ones longer than the others. Petals obovate and notched, or 

 obcordate, with a small inflexed point, the outer flowers radiant, with 

 one or two outer petals larger than the others, and deeply bifid. 

 Flowers white, or more or less deeply tinged, of a rose colour, small. 

 Stamens on short slender filaments, with small roundish anthers. 

 Styles short, with a small conical disk. Fruit nearly orbicular, very 

 neat, flattened, surrounded with a thickened accessory pale border, 

 scarcely notched, more or less clothed with hairs, as well as the disk. 

 Carpels with five very slender filiform cqui-distant ridycs at the back, 

 the two lateral ones distant from tiic others, dose to the margin. 



