LXX. COMPOSIT®. 173 
18. DIPLOPAPPUS, DC. 
Heads many-flowered, radiate ; rays female, in 1 row; disk- 
flowers 5-toothed, perfect. Receptacle flat, somewhat honey- 
combed. Involucre imbricate. Achenes compressed. Pappus 
double, the outer of short, inner of long, rough bristles.— 7, 
Cap. iil. p. 84. 
Much-branched shrubs or rigid simple stemmed herbs, differing from Aster 
in the pappus.—5 Cape species, dispersed. 
19. ERIGERON, Linn. 
Heads many-flowered, heterochromous, radiate ; rays female, 
in many rows, linear, equalling the disk (or longer) ; disk- 
flowers tubular, 5- toothed, either all perfect, or the outer 
female, or all abortive. Receptacle nude, honeycombed, or fim- 
brilliferous. Achenes compressed, beakless. Pappus bristle- 
shaped, rough, in 1 row.— #7. Cap. ii. p. 86. 
A large, chiefly Northern genus. /. Canadense, Linn., a species of 
American origin, now universally dispersed, is naturalized in the Eastern 
districts and at Natal. Root annual; stem much-branched ; leaves linear- 
lanceolate, ciliate ; heads small, very many, in panicles ; rays very narrow, 
scarcely longer than the involucre. 
20. NIDORELLA, Cass. 
Heads many-flowered, homochromous, radiate ; rays female, 
very shortly ligulate or 2-labiate, in 1, 2 or sev eral rOWS ; disk- 
flowers 5-fid, perfect, the aes cen Sera sterile. Tate: 
luere imbricate. Receptacle honeycombed. Anthers without 
tails. Achenes oblong, terete or subcompressed, mostly 
downy. Pappus in 1 row, of rough bristles, slightly connate 
at base.—Fl. Cap. i. p. 86. 
Herbs or undershrubs, chiefly South African. Teaves alternate, toothed 
or entire. Heads corymbose, rarely solitary ; disk and ray-flowers yellow. 
—16 species, dispersed. 
21. GARULEUM, Cass. 
Heads many-flowered, moncecious, radiate ; ray-flowers li- 
gulate, female; disk-flowers 5-toothed, male, with abortive 
ovaries. Receptacle convex, nude. Involucral scales 2-seriate. 
Style of disk-flowers with divergent arms, hairy outside, glan- 
dular at the margins inside. Achenes of ray obovate-oblong, 
3—4-ribbed, beakless, roughish ; of disk flat, smooth, empty. 
Pappus 0.— FV. Cap. ii. p. 92. 
South African undershrubs, with alternate, pinnatifid and toothed leaves. 
Heads peduncled, solitary ; rays blue; disk yellow.—3 species, dispersed. 
