PL ex. cal. 39. COMPOSITE, C. 217. Py rethrum. 453 
XLII. 217. FYRETHRUM. Dioscorides. Mayweed . 
Pericline hemispherical ; scales imbricate, coriaceous, 
edge membranaceous ; calathides radiated ; flowers all fer- 
tile; of the centre hermaphrodite, yellow ; of the rays fe- 
male, of a different colour ; ligulse oblong, toothed ; cli- 
nanthus convex, naked, tubercular ; akenia uniform ; pappus 
marginal, lobed or undivided. — Stem diffuse, branched; 
leaves much cut ; calathides solitary, terminal, scentless. 
1. Pyrethrum inodorum. Scentless mayweed. 
Stem branched, spreading; leaves sessile, pinnatifid, lobes 
linear, threadlike, 2 or 3-parted ; pappus not divided. 
Chamaemelum inodorum annuum humilius, foliis obscure virentibus, 
Dillen in Raii Syn. 186, 6. 
Chrysanthemum inodorum, Lin. S. P. 1253. 
Matricaria inodora, Hucls. FI. Angl. 372. 
Pyrethrum inodorum, Engl. Dot. 676. 
Fields and pastures ; annual ; August and September. 
Hoot fusiform; leaves lyrate, pinnatifid; calathides soli- 
tary, large ; peduncle naked ; pericline bald ; scales blackish 
on the edge. 
0. duplicatum. Flowers all ligulate. 
2, Pyrethrum maritimum. Sea mayweed . 
Ste7ii branched, spreading ; leaves sessile, bipinnatifid ; 
lobes linear, blunt, fleshy, bald, 3-cut; pappus lobed. 
Chamaemelum maritimum perenne humilius, foliis brevibus crassia, ob- 
scure virentibus, Dillen in Raii Syn. 186,7. 
Matricaria maritima, Lin. S. P. 1256. 
Matricaria inodora y, Uuds. FI. Angl. 373. 
Pyrethrum inodorum. Smith Ft. Brit. 901. 
Chrysanthemum maritima, Pevs. Syn. 462. 
Sandy and rocky sea-shores; perennial; July. 
Root woody; stem tufted, shining; leaf-loles short; ca- 
lathides terminal; pericline bald; scales black on the edges. 
XLIII. 218. MATRICARIA. Rrunsfel. Feverfew , 
Pericline hemispherical ; scales imbricate, coriaceous ; 
edges scariose, torn ; calathides radiated ; flowers all fer- 
tile ; of the centre hermaphrodite, of the rays female, of a 
different colour; liguke reverse ovate, very short, rarely 
wanting; clinanthus flat, naked; akenia furrowed ; pappus 
membranaceous, marginal, 5-lobed. — Stem upright; leaves 
petioled, pinnate; calathides corymbose, downy. 
