510 COMPOSITZ (Harv.) [ Didelta. 
sc. lanceolate, gland puberulous, spinoso-ciliate at base only ; achenes 
and pappus unknown. 
Has. Aapjes R., Zeyher! (Herb. Sd.) 
A small plant, very different in foliage from any other Berkheya. The only fl. 
head I have seen is completely worm-eaten; the genus is therefore at present doubt- 
ful. It may be a Stobea. 
CXL. DIDELTA, L’ Her. 
Heads mostly radiate; the ray-fl, when present, ligulate, neuter; 
dise-fl. 5-toothed, perfect. Recept. honey-combed, the margins of thecells 
rigidly fimbrilliferous, Inv. sc. concrete at base, in two rows; the se. of 
the rows very unequal, sometimes the outer, sometimes the inner scales 
largest. Filam. smooth. Achenes wingless. Pappus uniseriate, palea- 
ceous, the palez fimbriato-plumuse. DC. Prodr. 6, p. 503. 
Half-shrubs or herbs. Leaves opposite or alternate, entire or sinuate-toothed, 
unarmed or spinous, Heads terminal, peduncled, solitary. Fl. yellow. Name from 
dis, double, and deAra, the Greek letter A (D); the iny. is double, and the inv. se. 
in the original species triangular. 
— 1. CHoristea (Th,). Outer invol. sc. few, broadly ovate or cordate, inner 
sm. . 
Shrubby ; leaves opposite, cordate or elliptical, veiny ... (1) spinosum. 
Herbaceous ; lvys. alternate, oblongo-spathulate, veinless : 
Stem and leaves glabrous or nearly so Ses “eee: ‘wes (2) CAFNOSUI. 
Stem and leaves densely white-woolly + see «ee (3) tomentosum. 
Sect. 2. Cusprpra (Less.). Outer inv. scales numerous, very small, spine-tipped, 
inner larger, ovate-oblong or lanceolate, ciliate. Annuals. 
Stems elongate; lvs. clasping, obovate-oblong, not greatly 
tapering at base; ovaries nearly glabrous... ... ... (4) cernuum, 
Stems short; lvs. greatly tapering at base ; ovaries villous (5) annuum. 
Sect. 1. CHorisTea, (Sp. 1-3.) 
1. D. spinosum (Ait. Kew. 3, p. 256); shrubby, glabrous; leaves op- 
posite, decussate, sessile, broadly cordate or elliptical, mucronate, quite 
entire or distantly spiniferous, midribbed and. netted-veined beneath ; 
outer inv. sc. 4—5, very large, cordate-ovate. Less.! Syn. 60. DC. 1. c. 
503. Choristea spinosa, Thunb. Cap. 702. 
Has. Olifant’s R., Thunberg! Tulbagh, Dr. Thom! Bergvalley, Drege! Heere- 
logement, Clanw., E. & Z./ Zey,.! 978. Namaqualand, A. Wyley / Modderfontein, 
Rev. H. Whitehead! (Herb. Th., D., Hk., Sd.) 
Young parts sometimes tomentose, the toment. soon wearing off. Leaves some- 
times clasping, sometimes simply sessile, 2-2} in. long, 1-2 in. wide, of thin sub- 
stance, but rigid. Outer and medial invol. sc. leaf-like; innermost very smail and 
narrow, acute. 
2. D. carnosum (Ait. 1. c. 256); herbaceous, the young parts floccu- 
lent, then glabrous; leaves mostly alternate, fleshy, with immersed veins, 
oblongo-spathulate, tapering much at base; outer inv. se. 3-5, deltoid- 
ovate, subserrulate, veiny, inner lanceolate, acuminate. Less. / Syn. 61- 
DC.1.¢. 503% D. tetragonicefolium, I’ Her. St. Nov. t. 28. Chorestea 
carnosa, Th.! Cap. 703. 
Has. Cape, Thunberg! Heerelogement, Clanw., E. § Z.! Mierenkasteel and Hol- 
