78 COMPOSIT^E. 



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

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

 somewhat convex, with oblong-lanceolate wholl}^ scarious bracts subtending disk-flowers and 

 partly folded round the akenes. Kay-flowers 8 or 10, fertile ; ligule cuneate-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 

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



■i— -i— 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 bracts of receptacle 

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

 tened, glaV)rous ; the truncate summit naked, or with a very short coroniform or auriculate 

 pappus. Heads comparatively large. 



1 72. ACHILLEA. Involucre campanulate or obovate. ,Chaffy bracts of the receptacle 

 membranaceous, like the innermost Ijracts of the involucre. Kays few or several, sliort 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. 

 ■i— 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 corymbosel}^ cymose, never i-acemosely paniculate : akenes glabrous : tube of disk- 

 corolla either terete or ancipital. 



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

 3-5-ribbed or nerved on the face or sides, rouuded 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. 



-f— -1— Heads sessile, discoid, heterogamous : female flowers most numerous, apetalous; 

 their akenes pointed or armed with indurated persistent style. 



175. 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, with rigid wrings or callous margins, which are com- 

 monly spinulose-pointed at summit, and the apex armed by the spiuiform persistent style. 

 Pappus none. 



4— ^— -(— 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 wunged, in our species destitute of 

 pappus or nearly so. 



H— -1— -I— -1— 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 Avanting 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 liroad truncate summit, bearing 

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



178. ARTEMISIA, Heads paniculately disposed, few-many-flowercd, small, wholly dis- 

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



