COMPOSITE 135 



Second pair opposite, pinnatisect, linear-oblong in outline. 



Third pair opposite, linear-oblong, pinnatisect with the segments 

 pinnatifid in the upper half. 



Fourth pair pinnatisect, segments pinnatifid. 



Nos. 9-11. Alternate, pinnatisect, segments pinnatifid; ultimate 

 divisions linear-lanceolate, acute, small. 



Ultimate leaves oblong-linear, pinnatisect in the lower third, 

 with slender, linear, acute segments, pinnatisect, segments again 

 pinnatifid in the upper two-thirds, with subulate, lanceolate, acute 

 divisions. 



Pentzia virgata, Less. 



Hypocotijl erect, or more or less decumbent, terete,. glabrous, 

 pale green, 5-10 mm. above the soil. 



Cotyledons spathulate-oblong, obtuse, entire, glabrous, light 

 green, sessile, 3-5-4 mm. long, 1'25-1'75 mm. wide. 



Stem erect, terete, silky or almost hoary from loose or adpressed 

 hairs, ultimately becoming shrubby ; internodes short and several 

 of the primary ones hardly developed. 



Leaves simple, cauline, alternate, more or less hoary with 

 cottony, loosely adpressed hairs, light green when young, ultimately 

 pinnatisect, with alternate segments corresponding to the venation ; 

 petioles channelled above in the lower half, convex on the back, 

 dilated towards the base and semiamplexicaul, hairy, pale green. 



Nos. 1 and 2. Linear, subacute or obtuse, entire, slightly wider 

 towards the top and narrowed to the base, or petiolate. 



Nos. 3-6. Cuneate, trifid at apex, with acute segments, long, 

 petiolate. 



Nos. 7-9. Pinnati-fid or -sect, with one or two lateral and one 

 terminal segment ; segments linear, acute. 



Nos. 10-12. Similar but with more numerous pinnaa. 



Nos. 13-17. Pinnatisect, pinnatifid ; ultimate segments linear- 

 lanceolate or subulate, acute. 



Artemisia annua, L. 



Primary root normal, with a few lateral fibres. 



Hypocotyl tapering into and indistinguishable from the root, 

 colourless, fleshy. 



Cotyledons small, shortly oblong, obtuse, 2-5 mm. long, T5 mm. 

 wide. 



Stem developed when about to flower, herbaceous, annual. 



Leaves simple, radical and cauline, alternate, thinly pubescent, 

 bright green above, paler beneath and rather prominently nerved, 



