LXX. COMPOSITiE. 179 



disk-flowers linear, flattened, obtuse. Achencs of ray 3-cor- 

 nered, of disk ilat, without pappus, either pointless or crowned 

 with 1-3 minute teeth, the younger downy. — Fl. Cap. iii. p. 

 131. 



Tropical or subtropical herbs, scabrous or hairy. Leaves opposite, en- 

 tire or serrate, peuninerved. Peduncles axillary, 1-headed. — E. erecta^ 

 Linn., a common tropical weed, grows at Natal. 



40. SIEGESBECKIA, Linn. 



Heads few-flowered, radiate ; ray-flowers 1-seriate, female, 

 ligulate or irregular ; disk-flowers 3-5-toothed, hermaphrodite. 

 Involucre 2-seriate, the scales covered with gland-headed 

 bristles ; the 5 outer linear-spathulate, spreading ; the inner 

 half-clasping the ray-flowers. Eeceptacle flat, bearing oval- 

 oblong paleas wrapping round the achenes. Style-arms in the 

 disk-flow^ers short, somewhat flattened, very obtuse. Achenes 

 obovate-oblong, somewhat 4-angled, arching inwards, without 

 pappus. — Fl. Cap. iii. p. 132. 



»S^. orientalisy Linn., a common tropical annual weed, occurs near Natal. 

 Leaves opposite, ovate, tapering at base, coarsely toothed. Heads small, 

 yellow. 



41. WEDELIA, Jacq. 



Heads many-flowered, radiate ; ray-flowers ligulate, female, 

 in 1 row ; disk-flowers bisexual, tubular, 5-toothed. Invo- 

 lucre in 2-3 rows, the outer scales leaf- like, inner membranous. 

 Receptacle somewhat convex, covered with palese. Style-arms 

 in the disk-flowers tipped Avith a short cone. Achenes obovate 

 or compressed, beakless, with a crown-like or cup-like, often 

 substipitate pappus, consisting of concrete scales. — Fl. Cap. iii. 

 p. 132. 



Chiefly American undershrubs and herbs, with opposite, petioled, serrate 

 or 3-fid leaves, and soUtary, terminal, 1-headed pedicels. Flowers yellow. 

 — W. Nafalensis, Sond., occurs at Natal. 



42. BIDENS, Linn. 



Heads radiate or discoid ; ray-flowers ligulate, neuter ; disk- 

 flowers bisexual, 5-toothed. Involucral scales in a double 

 row. Receptacle flattish, bearing palea?. Style-arms tipped 

 with a short cone. Achenes more or less compressed, acu- 

 leate, tapering into a beak, tipped with 2-5 rigid, retrorsely- 

 hispid, scabrous bristles. — Fl. Cap. iii. p. 133. 



A large genus, chiefly American. Stems herbaceous. Leaves opposite, 

 often pinnate-parted and cut. Rays yellow or white. — £. pilosa, Linn., a 

 tropical weed, occurs in waste ground in the Eastern district and at Natal. 



n2 



