Pi ex. cat 39, COMPOSITiE, C. 217. Pyrethrum. 45S 



XLII. 217. PYRETHRUM. Dioscorides. Mayweed, 

 Pericl'me hemispherical ; scales imbricate, coriaceous, 

 edge membranaceous ; calalhides radiated ; jiowers all fer- 

 tile; of the centre hermaphrodite, yellow; of the rays fe- 

 male, of a different colour ; ligulae oblong, toothed ; cVi- 

 nanthus convex, naked, tubercular ; akenia uniform ; pappua^ 

 marginal, lobed or undivided. — Stem diffuse, branched; 

 leaves much cut ; calathides solitary, terminal, scentless. 



1. Pyrethrum hiodorum. Scentless mayweed. 

 Stem branched, spreading; leaves sessile, pinnatifid, lobes 



linear, threadlike, 2 or 3-parted ; pappus not divided. 



Chainaejnelum inodorum annuum humilius, foliis obscure vireatibus, 

 Dillen in Rail Syn. 186, 6. 



Cbrysantliemum inodorum, ]Lin. S, P. 1253. 

 Matricaria inodora, Huds. FL Jngl. 372. 

 Pyrethrum inodorum, Engl. Bot. 676. 



Fields and pastures ; annual ; August and September. 



Boot, fusiform; leaves lyrate, pinnatifid; calathides soli- 

 tary, large ; pedmicle naked ; pericline bald ; scales blackish 

 on the edge. 



B. duplicatum. Flowers all ligulate, 



2. Pyrethrum maritimum. Sea mayweed. 

 Stem branched, spreading ; leaves sessile, bipinnatifid ; 



lobes linear, blunt, fleshy, bald, 3-cut; pappus lobed. 



Chamaemelum maritimum perenne luimilius, foliis brevibus crasSis, ob- 

 Bcure virentjbus, Dillen in Rati Syn. 186, 7. 

 Matricaria mariiima, Lin. S. P. 1236. 

 Matricaria inodora y, Huds. Fl. Angi. 373. 

 Pyrethrum inodorum. Smith Ft. Brit. 901. 

 Cbrysauthemum maritiiua, Pers. Syn. 462. 



Sandy and rocky sea-shores; perennial; July. 

 Root woody ; stem tufted, shining ; leaf-lohes short ; ca^ 

 lathides terminal ; pericline bald ; scales black on the edges. 



i 



XLIII. 218. MATRICARIA. Brunsfel. Feverfew. 



Pericline hemispherical ; scales imbricate, coriaceous; 

 edges scariose, torn ; calathides radiated ; fioivers all fer- 

 tile ; of the centre hermaphrodite, of the rays female, of a 

 different colour; ligulae reverse ovate, very short, rarely 

 wanting'; clinanthus flat, naked; akenia furrowed ; pappus 

 membranaceous, marginal, 5-lobed. — Stem upright; leaves 

 petioied, pinnate ; calathides corymbose, downy. 



