COMPOSITE 133 



linear-lanceolate, rather obtuse, tapering at the base, glabrous, 

 glaucous-green, midrib with numerous ascending branches. 

 Second and third pairs alternate, and tri-lobed or -fid. 



Matricaria Partheuium, L. 



Primary root long, tapering, flexuose, with numerous lateral 

 rootlets. 



Hypocotyl short, stout, merging into and indistinguishable from 

 the root. 



Cotyledons small, subobovate, sessile, 5 mm. long, 8 mm. wide. 



Stem herbaceous, elongated when about to flower. 



Leaves simple, radical and ultimately cauline, alternate ; pubes- 

 cent on both surfaces, and densely covered with sessile glands, 

 highly odorous, more or less pinnately divided ; petioles pubescent, 

 channelled above, dilated and amplexicaul at the base. 



No. 1. Spathulate, entire or one-toothed. 



No. 2. Cuneate, obtuse, trifid or merely toothed. 



No. 8. Shortly and broadly oblong, pinnatifid. 



No. 4. Triangular, pinnatifid. 



No. 5. Pinnatifid, or pinnatipartite ; lobes subcuneate, toothed 

 at the apex, or slightly cut. 



No. 6. Triangular, obtuse, pinnatipartite ; lobes subpinnatifid 

 or toothed. 



No. 7. Ditto ; but lobes alternate, ovate and oblong, deeply pin- 

 natifid. 



Nos. 8 and 9. Triangular, almost pinnatisect ; lobes ovate, pin- 

 natifid and toothed, lower ones deeply cut on the basal, posterior side. 



The far. laciniatum has its larger leaves pinnatisect, pinnatipartite 

 and pinnatifid ; ultimate segments subulate or lanceolate, and acute. 



Matricaria globifera, Fzl. 



Hypocotyl as in M. Parthenium, subterranean. 



Cotyledons falling away early. 



Stem herbaceous, erect, terete, slightly pubescent ; internodes 

 crowded or many of the lower ones undeveloped. 



Leaves simple, ultimately pinnately multisect, radical and caul- 

 ine, lower petiolate, upper sessile, glabrous, deep green with the 

 segments convex above, minutely revolute at the margins, making 

 a shallow channel on each side of the rather prominent midrib in 

 the primary divisions, the midrib is absent in the smaller divisions ; 

 petioles glabrous, flattened on the upper surface or convex, dilated 

 and slightly channelled at the amplexicaul base, convex or deepen- 

 ing into a ridge beneath. 



