ee SS EE 
— - 
ANTHEMIS COMPOSIT Aé 361 
ACHILLEA 
-rigid wings or callous margins, sessile. 
+ + + Heads slender-peduncled, discoid, heterogamous: pistillate 
flowers apetalous: style deciduous, 
75 Coruta Rays wanting: receptacle flat or convex: achenes raised on 
pedicels. 
+ + + + Heads discoid, heterogamous, the few pistillate flowers 
with tubular 2-3-toothed or lobed corolla, or sometimes homogamous: 
style deciduous. 
76 Tanacetum Heads methine! cymose or glomerate, many-flowered : 
achenes 5-ribbed or 3-5 angled, with broad truncate summit: anther- 
tips broad and mostly obtuse. 
77. Artemisia Heads paniculately disposed, small: achenes obovate or 
oblong, mostly with a small epigynous disk: anther-tips pointed. 
70 ANTHEMIS L. Sp. 893. 
Annual or perennial herbs with pinnatifid or dissected alter- 
nate leaves and usually large heads of both tubular and ligulate 
flowers on peducles terminating the branches. Involucre hem- 
ispherical, many-flowered, of comparatively small imbricated 
bracts the outer successively shorter. Receptacle convex to ob- 
long, chaffy atleast toward the summit. Rays pistillate and 
fertile or neutral. Disk-flowers perfect, fertile, yellow, their 
corollas with 5-cleft limb. Anthers obtuse and entire at base. 
Achenes terete, 4-10-angled or ribbed, glabrous, the truncate 
summit naked, or with a very short coroniform or dentiform 
pappus. 
A. Coruta L, Sp. 894. Unpleasant-scented annual, 1-2 feet high, diffu- 
sely branched: leaves finely tri-pinnately dissected: receptacle conical, 
with bristly bracts only near the centre: rays mostly neutral, white: 
achenes 10-ribbed, rugose or tuberculate*’ Common along roadsides and 
waste places. Naturalized from Europe. 
A. arvensis L. Sp. 894. Annual or sometimes biennial, not fetid: stems 
usually much branched, about a foot high, the branches decumbent at base: 
leaves once or twice pinnately parted into linear-lanceolate acute lobes: 
heads rather long-peduncled: bracts of the involucre obtuse, whitish-scari- 
ous: receptacle conical, its bracts acuminate-lanceolate: rays white: 
achenes oblong, obtusely 4-angled: pappus a mere crown. In fields and 
waste places. Naturalized from Europe. 
71 ACHILLEA L. Sp. 898, 
Perennial herbs with erect leafy stems, alternate leaves and 
small radiate heads corymbose at the ends of the stem and 
branches. Involucre campanulate or obovoid, of small imbri- 
cated bracts, the outer shortest. Receptacle conical to oblong; 
chaffy. Ray-flowers pistillate, fertile, short and broad. Style- 
branches truncate. Anthers obtuse and entire at base Achenes 
oblong or obovate, obcompressed, callous-margined, glabrous. 
Pappus none. 
A. Millefolium L. Sp. 899. From villous-lanate to glabrate: stems 
simple. or corymbosely branched. above, 1-2 feet high: leaves narrowly 
