Conyza Less. nom. cons

Herbs; branchlets usually ribbed. Leaves alternate, linear, ohovate or spathulate, pinnately veined, margin entire to crenate-serrate. Heads heterogamous, disciform, corymbose or panicled, axillary or terminal, usually many. Involucral bracts multiseriate, linear-lanceolate; outer smaller. Receptacle flat or convex, naked or pitted, fimbriate. Outer florets female, fertile, 2-many-seriate, filiform, rarely ligulate, 2 - 3-toothed. Disc florets bisexual, fertile, few, tubular, 5-toothed. Anther bases obtuse, entire. Style arms of female flattened, usually slender. Achenes minute, laterally compressed. Pappus slender, 1 - 2-seriate, scabrous.

Temperate and subtropical regions of the world; ca 60 species, 10 in India.

KEY TO THE SPECIES

1a. Pappus hairs white or dirty white or yellow

2

b. Pappus hairs usually red

5

2a. Pappus hairs yellow

3. Conyza bonariensis

b. Pappus hairs white or dirty white

3

3a. Heads pale rosy or purplish

4. Conyza canadensis

b. Heads yellowish

4

4a. Pappus ca 2 mm long, white

8. Conyza semipinnatifida

b. Pappus ca 4 mm long, dirty white

10. Conyza sumatrensis

5a. Plants not viscid; heads 0.2-0.3 cm across

9. Conyza stricta

b. Plants viscid; heads 0.4-1.5 cm across

6

6a. Leaves elliptic-oblong, narrowed at both ends, acute, entire or faintly dentate; corolla pink or pale violet

6. Conyza leucantha

b. Leaves oblong-spathulate, serrate-pinnatilobed, obtuse at apex

7

7a. Leaves pinnatilobed

1. Conyza aegyptiaca

b. Leaves serrate-dentate or coarsely toothed or often entire

8

8a. Pappus hairs 4 mm long

7. Conyza rufa

b. Pappus hairs 2-3 mm long

9

9a. Leaves narrowly linear

2. Conyza angustifolia

b. Leaves obovate-spathulate, oblong or lanceolate

5. Conyza japonica

List of Lower Taxa