LXX. COMPOSIT®. 179 
disk-flowers linear, flattened, obtuse. Achenes of ray 3-cor- 
nered, of disk flat, without pappus, either pointless or crowned 
with 1-8 minute teeth, the younger downy.—#. Cap. iii. p. 
‘181. ‘ 
Tropical or subtropical herbs, scabrous or hairy. Leaves opposite, en- 
tire or serrate, penninerved. Peduncles axillary, 1-headed.—Z. 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. Receptacle flat, bearing oval- 
oblong palez wrapping round the achenes. Style-arms in the 
disk-flowers short, somewhat flattened, very obtuse. Achenes 
obovate-oblong, somewhat 4-angled, arching inwards, without 
pappus.— #7. Cap. iii. p. 182. 
S. ortentalis, 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 witb palez. Style-arms 
in the disk-fiowers tipped with a short cone. Achenes obovate 
or compressed, beakless, with a crown-like or cup-like, often 
substipitate pappus, consisting of concrete scales — FU. Cap. iii. 
p. 132. 
Chiefly American undershrubs and herbs, with opposite, petioled, serrate 
or 3-fid leaves, and solitary, terminal, 1-headed pedicels. Flowers yellow. 
—W. Natalensis, 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 palez. 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. i. p. 138. 
A large genus, chiefly American. Stems herbaceous. Leaves opposite, 
often pinnate-parted and cut. Rays yellow or white.—B. pilosa, Limn., a 
tropical weed, occurs in waste ground in the Eastern district and at Natal. 
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