FEVERFEW. — CORN MARYGOLD. 



31 



all the florets, oblong, quadrangular, each crowned with an 

 erect, membranous, more or less lobed border. Receptacle 

 naked, dotted, convex. 



Essential character. — Receptacle naked. Seeds crowned 

 with a membranous margin. Calyx hemispherical, imbri- 

 cated with sharpish scales, bordered with a membrane. 



The " Corn feverfew, or scentless Mayweed," the " Pyre- 

 thrum inodorum," has the leaves pinnate in many capillary 

 segments. Stem branched, spreading; seed crown entire. 

 Root tapering, annual. Branches somewhat corymbose, 

 each terminated by a rather large flower, with long white 

 rays, and a prominent yellow disk. 



This weed grows mostly on gravelly soils, and flowers in 

 autumn. Cutting up the plants by the hoe in drilled crops 

 will prevent the seeds being perfected ; and when perfect seed- 

 ing does happen, the seeds must be very carefully separated 

 from the grain by winnowing, and destroyed by burning. 



26. The Corn marigold," or the " Crysanthemum " of 

 botany, is a very troublesome weed in some soils. The plant 

 belongs to the class and order " Syngenesia polygamia super- 

 flua" of Linneus, and the natural order " Corymbiferse" of 

 Jussieu. 



Generic character. — Calyx common, hemispherical, im- 

 bricated ; interior scales larger by degrees, innermost mem- 

 branous. Corolla compound, radiated. Florets of the ray 

 female, and strap-shaped of the disk ; hermaphrodite, funnel- 

 shaped, spreading the length of the calyx. Stamina five, 

 capillary very short, anthers forming a hollow cylinder. 

 Pistil : germ egg-shaped ; style filiform, longer than the 

 stamens ; stigmas two, obtuse, revolute. Seeds one to each 

 floret, oblong, not crowned with a marginal rim. Receptacle 

 naked, dotted, convex. 



Essential character. — Receptacle naked. Seed without 

 a marginal ring. Calyx hemispherical, imbricated; scales 

 dilated at the margin, membranous. 



The " Corn marigold," or the Chrysanthemum segetum," 

 has the leaves embracing the stem glaucous, laciniated near 

 the summit, toothed at the base. Root annual, spindle- 



