MATRICARIA. ARTEMISIA. 177 



16. (17.) MATRICARIA Linn. Feverfew. 



1. M. Parthenium (L.) ; I. stalked pinnate, segments ovate or 

 oblong pinnatifid, lobes cut, st. branched, heads corymbose, phyll. 

 linear obtuse, receptacle convex, fr. crowned with a short jagged 

 membrane. E. B. 1231. St. erect, 2 feet high, branched, fur- 

 rowed, panicled. Heads in small corymbs terminating the stem 

 and branches ; disk yellow ; ray white. Waste places, not very 

 common. P. VII. VIII. Feverfew. 



2. M. inodora (L.) ; L sessile pinnatiftd with many capillary 

 pointed segments., st. branched, heads solitary, phyll. lanceolate 

 obtuse, receptacle ovate, fr. rugose and with 2 round glandular 

 dots on the external face just below the elevated entire border. 

 E. B. 676. St. erect, 12 18 in. high, smooth, angular. L. in 

 very narrow elongated mostly alternate segments "furrowed 

 beneath." Heads solitary, terminating the branches ; margin of 

 phyll. cut and fuscous ; ray white ; disk yellow. Fr. with 3 pro- 

 minent smooth ribs ; intermediate spaces rugose, 2 narrow and 

 internal, 1 broad and external. /3. M. maritima (L.) ; segments 

 fleshy linear bluntish convex above, principal ribs keeled beneath, 

 fr. with 2 elongated glandular spots on the external face just 

 below the lobed elevated border. E. B. 979. L. with short 

 crowded mostly opposite segments. " Margin of phyll. pale and 

 entire." Fr. with 3 prominent smooth ribs; a narrow interme- 

 diate rugose space externally, 2 internal spaces reduced to simple 

 lines. Fields and waste places, ft. Sea-shore. A. VII. VIII. 



3. M. Chamomilla (L.) ; 1. bipinnate smooth, segments capil- 

 lary simple or divided, heads solitary, receptacle hollow conical, 

 phyll.linear obtuse. E.B. 1232. St. erect, 1 foot high, branched. 

 Heads on long naked stalks; disk yellow; ray white. Cultivated 

 and waste ground. A. VI. VII. Wild Chamomile. 



17. (18.) ARTEMISIA Linn. Wormwood. ! 

 * Receptacle hairy. 



1. A. Absinthium (L.); heads drooping hemispherical hetero- 

 gamous, 1. silky in many deep lanceolate obtuse segments, outer 

 phyll. linear silky, inner roundish scarious. E. B. 1230. St. 

 bushy, 1 2 feet high. Heads in erect aggregate leafy panicles. 

 Floral 1. simple. Florets dull yellow, the outer row female. 

 Waste ground. P. VII. VIII. Wormwood. 



Receptacle naked. 



