78 COMPOSITaE. 



170. LEUCAMPYX. luvoliicre broadly hemispherical ; its bracts broadly oval, equal, in 

 2 or 3 series of 4 or 5 each, membranaceous, their margius white-scarious. Receptacle 

 somewhat convex, with oblong-lanceolate wholly scarious bracts subtending disk-flowers and 

 partly folded round the akenes. Eay-Howers 8 or 10, fertile; ligule cuneate-obovate, ample, 

 on a slender glandular tube, somewhat persistent on the akene. Dlsk-flowei-s numerous : 

 corolla with narrow tube, ampliate-campauulate throat, and 5 spreading lobes : style-branches 

 linear, with an obscure obtuse tip slightly produced l)eyond the stiginatic portion. Akeues 

 large for the tribe, obovate-trigouous, with narrowed base and rounded summit, lightly 

 5-nerved, glabrous, slightly incurved. Pappus an obscure squamellate crown, soon obsolete. 



•i^ H^ Involucre of comparatively small imbricated bracts, the outer successively shorter : 

 receptacle convex to oblong : style-branches truncate-penicillate. 



171. ANTHEMIS. Involucre hemispherical, many-flowered. Chaffy )n-acts of receptacle 

 sometimes hyaline, sometimes aristiform. Akenes terete or 4-10-angled or ribbed, not flat- 

 tened, glabrous ; the truncate summit naked, or with a very short coroniform or auriculate 

 pap])us. Heads comparatively large. 



172. ACHILLEA. Involucre campanulate or obovate. Chaffy bracts of the receptacle 

 membranaceous, like the innermost bracts of the involucre. Kays few or several, short and 

 broad. Akenes oblong or obovate, obcompressed, callous-margined, glabrous, destitute of 

 pappus. 



* * Eeceptacle naked, i. e. destitute of bracts or chaff among the flowers. 

 -1— Heads comparatively large, radiate, or rarely discoid and homogamoiis by the absence 

 of ligulate female flowers, pedunculate, solitary at the summit of the branches, or some- 

 times corymbosely eymose, never racemosely jianiculate : akeues glabrous : tube of disk- 

 corolla either terete or ancipital. 



1 73. MATRICARIA, Receptacle conical or ovoid, or rarely lower when young. Akenes 

 3-.5-rilibed or nerved on the face or sides, rounded on the back. 



174. CHRYSANTHEMUM. Receptacle from flat to hemispherical. Akenes (at least 

 of the disk) 5-10-ribbed or nerved all round; of the ray in certain species triquetrous. 



-)— -t— Heads se.ssile, discoid, heterogamous : female flowers most numerous, apetalous; 

 their akenes pointed or armed with indurated persistent style. 



1 75. SOLIVA. Heads many-flowered, largely of female flowers : a few hermaphrodite but 

 mostly sterile ones in the centre ; these with a short and thick 2-6-toothed corolla and usually 

 undivided style. Involucre of 5 to 12 nearly equal bracts in not more than 2 series. Re- 

 ceptacle flat. Akenes obcompressed, vv-ith rigid wings or callous margins, which are com- 

 monly spinulose-poiuted at summit, aud the apex armed by the spiniform persistent style. 

 Pappus none. 



•)— -I— -)— Heads slender-peduncled, discoid, heterogamous : female flowers apetalous : style 

 deciduous. 



176. COTULA. Heads man^'-flowered : female flowers in one or two rows: disk-flowers 

 with 4-tootlied corolla, fertile or infertile. Bracts of the involucre greeni.sh, in about 2 ranks. 

 Akenes raised on pedicels at maturity (these remaining on the flat or convex rece]itacle), 

 obcompressed, commonly thick-margined or narrowly winged, in our s])ecies destitute of 

 papi)us or nearly so. 



H— -1— -1— H— Heads discoid, heterogamous, and the few or uniserial female flowers with a 

 tubular 2-3-toothed or lobed corolla (in one species imperfectly radiate), or sometimes 

 homogamous, the female flowers wanting and the hermaphrodite rather few : style de- 

 ciduous : akenes truncate or obtuse : receptacle quite naked or sometimes hirsute : 

 involucre imbricated in few or several ranks. 



177. TANACETUM. Heads corymbosely eymose or glomerate, rarely solitary, many- 

 flowered : female flowers with tubular S-.'i-toothed corolla, either equal or oblicpie or im- 

 perfectly ligulate. Akenes .'j-riblied or 3-5-angular, with broad truncate summit, bearing 

 a coroniform pappus or none. Anther-tips broad and mostly obtuse. 



178. ARTEMISIA. Heads paniculately disposed, few-many-flowered, small, wliolly dis- 

 coid, heterogamous, the female flowers with smalLaud slender tubular corolla, and the her- 



