CARDUACEAE 1471 
pinnatifid. Heads corymbose.  Involuecre 
emispherie to saucer-shaped: braets in 2 
3 series, usually narrow, often partly 
similar. Receptacle convex, naked. Ray- 
flowers 5-20, pistillate, fruit-producing: 
corollas with erect or spre ind inconspicu- 
ous, yellow ligules. Disk-flov numerous, 
rfect, fruit-producing: bod with 
tube and throat only eon nom ded 
A beyli of th 
| 
chenes sube rie, thos ray | 
mostly 3-angled, those of Hs disk 5-angled 
s a crown-like border.—About 30 spe- i 
appus a 
cies, widely distributed in the Northern 
Hemisphere. 
i T. Mar edi L. Plants po 3-10 dm. tall, acrid-aromatic: leaf- Aa 
5—20 e m. long, with x ultimate segments sharply toothed: involuere 
wide, the inner bracts 4-5 mm. long: ray-flowers scarcely eee the disk 
and so inconspieuous as Pa make ke heads appear discoid; corollas yellow: 
achene t 2 long.—-(TANSY.)—Fields, roadsides, and about Sici 
various provinces, . Ga. to "Miss., Calif. Wash., and N. S. ‘Nat of O. W.—Sun 
ARTEMISIA L. Annual or perennial, often copiously branehed 
d 
113. 
herbs, or shrubs. Leaves alternate: blades dissected, “lobed, or toothe ; or 
i S tively small, mostly in panicles, usually nodding before 
maturity, apparently discoid, the marginal flowers without ligules or wanting 
Involuere campanulate to hemispheric: bra 2-4 es, the inner longer 
than the outer. Receptaele convex or naked 1airy. 
Flowers yellowish or greenish. Marginal flowers aps d Movers) 
pistillaate, fruit-producing: | eerie various, sometimes oblique, anting. 
Disk-flowers few, ae often fruit-producing: corollas ae ae. Pad 
form, or trumpet-shaped. chene ellipsoid, terete. Pappus wanting.—About 
250 species, in the Northern Hemisphere and South Ameriea.—WORM' WOODS. 
D flowers not producing fruits: stigmas united or very short and erect: receptacle 
I. DRACUNCULOIDES, 
Disk- flowers fruit- producing, their stigmas elongate and 
recurved. 
Receptacle hairy. II. FRIGIDAE. 
Receptacle naked. 
nnual or ann herbs. III. ANNUAE. 
Perennial plant 
Leaf-blade s with broad lobes IV. VULGARES. 
"s blades bipinnatifid, the segments very nar- 
row or filiform. V. PONTICAE. 
I. DRACUNCULOIDES 
Plant biennial: heads mostly erect. 
Plant perennial: heads mostly nodding. 
A. caudata 
. Å. campestr is. 
m 
II. FRIGIDAE 
Woody perennial: leaf-blades with linear to ovate obtuse teeth. 3. A. Absinthium. 
II. ANNUAE 
Heads in dense axillary spikes, not nodding. 4. A. biennis. 
Heads in lax racemes or panicles, nodding. . A. annua. 
e 
