78 COMPOSITE. 



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

 2 or 3 series of 4 or 5 each, membrauaceous, their margins white-scarious. Receptacle 

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

 partly folded round the akenes. Ray-flowers 8 or 1 0, fertile ; ligule cuueate-obovate, ample, 

 on a slender glandular tube, somewhat persistent on the akene. Disk-flowers numerous: 

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

 linear, with an obscure obtuse tip slightly produced beyond the stigmatic portion. Akenes 

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

 :"> nerved, glabrous, slightly incurved. Pappus an obscure squamellate crown, soon obsolete. 



-i -t Involucre of comparatively small imbricated bracts, the outer successively shorter : 

 receptacle convex to oblong : style-branches truucate-pemcillate. 



171. ANTHEMIS. Involucre hemispherical, many-flowered. Chaffy bracts of receptacle 

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

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

 pappus. 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. 



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



K- Heads comparatively large, radiate, or rarely discoid and homogamous by the absence 

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

 times corymbosely cymose, never racemosely paniculate : akeues glabrous : tube of disk- 

 corolla either terete or aucipital. 



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

 3-5-ribbed 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. 



) -) Heads sessile, 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-G-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, with rigid wings or callous margins, which are com- 

 monly spinnlose-poiuted at summit, and the apex armed by the spiniform persistent style. 

 Pappus none. 



4 H -i Heads slender-peduncled, discoid, heterogamous : female flowers apetalous : style 

 deciduous. 



176. COTULA. Heads many-flowered: female flowers in one or two rows: disk-flowers 

 with 4-toothed corolla, fertile or infertile. Bracts of the involucre greenish, in about 2 ranks. 

 Akenes raised on pedicels at maturity (these remaining on the flat or convex receptacle), 

 obcompressed, commonly thick-margined or narrowly winged, in our species destitute of 

 pappus or nearly so. 



f -i H -I 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 cymose or glomerate, rarely solitary, many- 

 flowered : female flowers with tubular 3-5-toothed corolla, either equal or oblique or im- 

 perfectly ligulate. Akenes 5-ribbed 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, wholly dis- 

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



