1
|
+
|
Capitula radiate.
|
12
|
|
–
|
Capitula disciform or discoid.
|
2
|
2
|
+
|
Cypselas epappose sometimes pappus rudiment-tary, rarely with 1-2 bristles.
|
3
|
|
–
|
Cypselas pappose, pappus of well-developed bristles or at least present in disc florets cypselas.
|
7
|
3
|
+
|
Prostrate herbs.
|
4
|
|
–
|
Erect herbs.
|
5
|
4
|
+
|
Pappus absent or a papillose rim or with 1 or 2 bristles. Disc corollas not spreading.
|
1. Dichrocephala
|
|
–
|
Pappus of partially fused corona or with a lacerate rim or a palaceous teeth. Disc corolla with widely spreading lobes.
|
2. Grangea
|
5
|
+
|
Phyllaries not keeled. Receptacle conical or cyathiform. Cypselas neither beaked nor ribbed.
.
|
6
|
|
–
|
Phyllaries with basally keeled midrib. Receptacle not as above, convex hemispheric or globose. At least marginal cypselas shortly beaked, 2-ribbed.
|
3. Myriactis
|
6
|
+
|
Plants hirsute to glandular. Inflorescence loosely cymose. Phyllaries 3-seriate. Disc florets few, functionally male, present only in the centre. Cypselas totally glabrous.
|
4. Cyathocline
|
|
–
|
Plants pilose or glabrescent. Inflorescence paniculate. Phyllaries 1-2-seriate. Disc florets many, perfact. Cypselas distally glabrous and basally glandular.
|
1. Dichrocephala
|
7
|
+
|
Capitula discoid.
|
10. Aster
|
|
–
|
Capitula disciform.
|
8
|
8
|
+
|
Plants with usually thick woody rhizome. Stem bases usually covered with marcescent leaf bases. Disc florets functionally male (sterile).
|
8. Psychrogeton
|
|
–
|
Plants tap rooted, sometimes with thin, not woody rhizome. Stem bases not covered with marcescent leaf bases. Disc florets bisexual, fertile.
|
9
|
9
|
+
|
Receptacle flat to slightly convex or conic. Female florets tubular with long limbs. Involucre urceolate or subcylindric.
|
12. Erigeron
|
|
–
|
Receptacle hemispheric-conic to lentilcular-knobby. Female florets with short erect limbs. Involucre campanulate to hemispheric campanulate.
|
10
|
10
|
+
|
Cypselas (2-) 3-5 (-10) ribbed. Pappus 4-seriate, bristles white to brownish, ± equal.
|
13. Symphyotrichum
|
|
–
|
Cypselas unribbed or 2-ribbed. Pappus 1-2 seriate, bristles whitish-yellow, orangish or cinnamon, outer ones short and few, inner ones longer and numerous.
|
11
|
11
|
+
|
Phyllaries subequal, outer ones leafy. Disc florets > 5, limb shortly funnelform. Cypselas 2-ribbed.
|
9. Neobrachyactis
|
|
–
|
Phyllaries unequal, outer ones memberanous. Disc florets 4-5, limb distinctly funnelform. Cypselas not ribbed.
|
5. Eschenbachia
|
12
|
+
|
Disc florets functioinally male, sterile.
|
8. Psychrogeton
|
|
–
|
Disc florets bisexual, fertile.
|
13
|
13
|
+
|
Cypselas epappose.
|
6. Bellis
|
|
–
|
Cypselas pappose.
|
14
|
14
|
+
|
Phyllaries with an orange glandular or eglandular, resinous midrib.
|
15
|
|
–
|
Phyllaries without orange resinous midrib.
|
16
|
15
|
+
|
Capitula many in corymbiform, paniculiform synflorescene on terminal and lateral branches. Ray florets usually coiling. Cypselas obconic to cylindric, sometimes compressed, 5-8(-10) ribbed.
|
11. Solidago
|
|
–
|
Capitula mostly solitary. Ray florets not as above. Cypselas oblong, compressed, 2-4 ribbed.
|
12. Erigeron
|
16
|
+
|
Outer phyllaries leaf like, inner ones scarious.
|
17
|
|
–
|
Outer phyllaries not leaf like, inner ones membranous, not scarious.
|
18
|
17
|
+
|
Pappus 3-seriate, dirmorphic, outer series of short bristles or scales, inner long bristly. Outer phyllaries large, inner ones much smaller. Ray florets ligule many times longer than disc florets.
|
7. Callistiphus
|
|
–
|
Pappus biseriate, monomorphic. Outer phyllaries small, inner ones somewhat smaller or slightly longer than outer. Ray florets ligules not many times longer than disc florets.
|
9. Neobrachyactis
|
18
|
+
|
Ligule of ray florets longitudinally involute or revolute. Limb of the disc florets cylindric to narrowly funnelform.
|
12. Erigeron
|
|
–
|
Ligule of ray florets plain, rarely involute. Limb of the disc florets campanulate to funnel form.
|
19
|
19
|
+
|
Pappus (2-) 4-seriate, persistent. Disc florets gradually expanded, lobes deltate. Cypselas (2-) 3-5 (-10) ribbed.
|
13. Symphyotrichum
|
|
–
|
Pappus 1-2-seriate, deciduous. Disc florets not gradually expanded, lobes triangular or lanceolate. Cypselas 0 or 2-ribbed.
|
20
|
20
|
+
|
Aromatic herbs. Capitulum mostly solitary. Phyllaries 5-7 seriate, recurved. Lobes of disc florets lanceolate.
|
14. Lachnophyllum
|
|
–
|
Plants not aromatic. Capitulum many, rarely solitary. Phyllaries 2-4 (-5) seriate, not recurved. Lobes of disc florets triangular.
|
21
|
21
|
+
|
Leaves with a fragile cartiligeneous apex. Inner phyllaries apially fimbriate. Pappus uniseriate, connate.
|
15. Chamaegeron
|
|
–
|
Leaves without fragile cartiligeneous apex. Inner phyllarlies not fimbriate. Pappus biseriate, outer series ± small scaly, not connate.
|
10. Aster
|