320 XXXIX. COMPOSITAE. [Matricaria. 



* MATRICARIA, Tourn. 



Involuoral bracts in few series ; margins sed,rious. Receptacle at first flat, 

 conical in fruit, naked. Eay-florets 1-seriate, female, ligulate, sometimes 0. Disk- 

 florets hermaphrodite, tubular, 4-5-toothed. Anthers without tails. Achenes 3-5- 

 costate. Pappus a membranous epigynous disk or 0. Annual or rarely perennial 

 herbs, with dissected leaves. 



Branches short. Heads rayless. Eeceptaole conical . . . . ..' M. discoidea. 



Branches spreading. Rays spreading. Eeceptaole conical . . . . .. * M. Ohamomilla. 



Branches spreading. Rays spreading. Receptacle broadly ovate-conical . . * M. inodora. 



* M. diseoidea, DC, Prod. vi. 51. Annual, erect, glabrous, rather stout. 

 Stem furrowed, 6in.-9in. high, sparingly branched. Leaves 2-3-pinnatifid ; segments 

 usually short, linear, acute. Heads on short pedicels, rayless ; involucral bracts 

 shorter than the receptacle, oblong, obtuse, with scarious margins. Eeceptaole 

 elongate, conical in fruit. Aohene almost terete. Pappus 0. 



NORTH Island: plentifully naturalised about Auckland. Feb., March. Oregon. 



* M. Ohamomilla, L., Sp. PI. 891. Annual, faintly aromatic, erect, 1ft. high, 

 rather slender, branched. Leaves glabrous, 2-pinnate ; segments capillary. Heads 

 terminal or subcorymbose, -lin.— |in. in diameter. Eeceptacle elongating, conical, 

 hollow. Eay-florets sometimes 0. Achenes 5-ribbed on the inner face. 



NORTH Island : Auckland, T. K., Cheeseman. Sparingly naturalised in cultivated land and 

 waste places, but often confused with M. inodora. Europe. 



* M. inodora, L., Fl. Suec. ii. 765. Annual, much branched, slender. Leaves 

 2-pinnatitid ; segments capillary. Heads Sin. in diameter, on long naked peduncles ; 

 involucral bracts with brown margins. Eeceptacle broadly conical or ovate in fruit. 

 Eays numerous. Achenes with 3 strong ribs on the inner face and 2 apical pits on 

 the outer face. Pappus a short cup or crown. 



NORTH and SOUTH Islands : commonly naturalised. Feb., March. Europe. 



• CHRYSANTHEMUM, Tourn. 



Involucre campanulate; bracts imbricating in several series, small, with scarious 

 margins. Eeceptacle broad, flat or convex, naked. Eay-florets in 1 series, female, 

 ligulate, large, white or yellow. Disk-florets hermaphrodite, tubular, 4-5-toothed. 

 x\chene3 of the ray-florets ribbed or winged, of the disk-florets compressed. Pappus 0. 

 Herbs, with alternate or radical toothed lobed or pinnatifid leaves. 



Stems much branched. Heads corymbose . . . . . . . . * G. Parthenium. 



Stems sparingly branched. Heads solitary, large, golden-yellow . . .." C. segetum. 



Stems usually simple. Heads solitary. Rays white .. .. .. * C. Leucanthemum. 



* C. Parthenium, Bernh., Syst. Verz. Erf. 145. Perennial, erect, branched, 

 lft.-2ft. high. Leaves petioled, pinnate ; leaflets pinnatifid ; segments lobulate or 

 toothed. Heads numerous, corymbose, |in.-fin. in diameter, on slender terminal 

 peduncles ; involucral bracts ribbed ; margins scarious. Disk-florets yellow ; ray 

 white. Achene ribbed. 



NORTH Island : chiefly in waste places ; naturalised. Fever-few. Feb. Europe. 



*■ C. segetum, L., Sp. PL 889. Annual, erect, glabrous, Ift.-lp. high, 

 sparingly branched. Leaves obovate, the lower petioled and pinnatifid, the upper 

 clasping, lobulate and toothed. Heads terminal, solitary, 2in. in diameter ; involu- 



