376 AUTUMN FLOWEHS AND FRUITS. 



acute, mostly entire ; heads solitary, on long terminal stalks, 

 the disk florets yellow, those of the ray white; involucral 

 scales ol:)tuse, with white membranous margins ; fruit terete, 

 tubercular-striated; whole plant fetid and acrid. — Fields and 

 waste places. Fl. Jidy to September. 



** Scales of the receptacle thin, membranous, ohtuse. 

 A. nobilis: stem procumbent, one foot long, much branched ; 

 leaves bipinnate, the leaflets linear-subulate, slightly downy 

 and fleshy, acute; heads solitary, terminal, the florets of the 

 disk yellow, of the ray white; fruit subtrigonous, smooth; 

 whole plant pleasantly aromatic. — Chamomile. — Gravelly 

 places. Fl. July to September. 



(27) Artemisia. 



* Receptacle hairy. 

 A. Absinthium : stem bushy, 1-2 feet high ; leaves silky, 

 in many deep lanceolate-obtuse segments; heads drooping, 

 hemispherical, in erect aggregate leafy panicles; floral-leaves 

 simple; florets dull yellow, the outer row female. — Worm- 

 wood. — Waste ground. Fl. July to September. 



** Heceptacle naked. 



A. vulgaris : stem 2-3 feet high, erect, leafy ; leaves woolly 

 and white beneath, pinnatifid, with lanceolate-acuminate cut 

 and serrated segments; heads ovate, the clusters leafy, nearly 

 simple, erect; flowers few, reddish or brownish yellow. — Mug- 

 wort. — Waste ground. Fl. July to September. 



A. maritima : stem decumbent or ascending, woolly, much 

 branched; leaves downy, pinnatifid, with linear, obtuse seg- 

 ments ; racemes unilateral, the heads drooping, oblong ; 

 florets few, all perfect; reddish-yellow. — Salt marshes. Fl. 

 August, September. 



