UMBELLIFER^E 



39 



(in small or weakly seedlings tri-lobed and -nerved), pale green 

 above and coarsely hairy, paler and almost villous beneath, ulti- 

 mately pubescent on both surfaces ; petiole subterete, shallowly 

 channelled on the upper side, pale green and subvillous on the 

 upper half, reddish and coarsely hairy on the lower, long, but 

 length variable. 



Intermediate forms are trifid, tripartite or trisect, with lobulate 

 and dentate-serrate divisions. Further developed leaves are tri- 

 angular, acute, pinnatisect and deeply pinnatifid ; primary divisions 

 triangular, acute, deeply pinnatifid and lobulate, dentate-serrate ; 

 terminal division broadly triangular, acute, deeply tripartite, 

 lobulate and dentate-serrate. 



Heracleum villosum, Fisch. (fig. 416). 



Primary root stout, fleshy, tapering downwards and giving rise 

 to short lateral fibrils, biennial. 



Hypocotyl stout, fleshy, merging into the root. 



Cotyledons sometimes rather unequal, linear-oblong, obtuse, 

 tapering into the petiole, which is 

 dilated and sheathing at the base, chan- 

 nelled above, glabrous, 2-6-3-9 cm. long, 

 5 mm. at the widest. 



Stem herbaceous, undeveloped till it 

 flowers. 



Leaves simple, radical and cauline, 

 alternate, exstipulate, petiolate, hispid, 

 glandular and odorous ; petiole chan- 

 nelled above, convex and ridged be- 

 neath, coarsely hairy, reddish at the 

 base and pale green upwards, much 

 dilated and sheathing at the base. 



No. 1. Eotund-cordate, obtuse, pal- 

 mately five-nerved, rather deeply cre- 

 nate ; crenatures mucronate, 



No. 2. Palmately five-nerved, tri- 

 lobed, cordate at the base, dentate- serrate 

 with acute or mucronate serratures. 



Intermediate forms are first triangu- 

 lar, trilobed, cordate at the base, and dentate-serrate. 



Another stage in advance would be tripartite ; lateral segments 

 ovate, irregularly dentate-serrate ; terminal lobe trifid and dentate- 

 serrate. 



Ultimate leaves pinnatipartite and deeply pinnatifid in the lower 



FIG, 416. Heracleum villosum. 

 Half nat. size. 



