[Orown Copyright Reserved. 
ROYAL BOTANIC GARDENS, KEW. 
BULLETIN 
MISCELLANEOUS INFORMATION, 
No. 10] (1916 | 
XLV.—NOTES ON AFRICAN COMPOSITAE: III. 
Pentzia, Thunb. 
J. Hurcnrnson, 
(With Plate.) 
As limited in Harvey and Sonder’s Fiora Capensis, Pentzia 
and Matricaria are not separable by any definite character. e 
find in the generic key on page 128 of volume iii. that the species 
of Pentzia are characterised as ‘shrubs or half-shrubs,” and 
Matricaria as “ annuals, with pinnatisect leaves.’ But instead 
of uniting the two genera, as might reasonably be done, it seems 
better, in order to make as little change in the nomenclature as 
Possible, to recast them by retaining in the South African 
Matricaria only those species with ray-flowers, and transferring 
the discoid species to Pentzia. The latter genus is restricted in 
distribution to South and South Tropical Africa, whilst Matri- 
caria occurs in the Northern Hemisphere with a few representa- 
tives in South East Tropical and South Africa. The boreal 
Species of Matricaria have predominantly radiate capitula, very 
few species being discoid. Relying partly on the geographical 
distribution, therefore, as Bentham has done in the case of Aster 
ad Olearia, we may distinguish the two genera as follows : — 
Pentzia, Thunb.—Capitula discoidea ; frutices, suffrutices 
vel plantae annuae. Distrib.: Afr. austr. trop. et extratrop. 
Matricaria, Zinn.—Capitula radiata vel species paucae 
boreales discoideae. Distrib.; Hemisph. bor., Afr. austr. et 
trop. orient. 
corymbs 
Pentzia is a good example of the large increase in the number 
of new species ohigh ca been discovered since the publication 
(4659.) We. 71—798. 1,125. 19/16 J.T.&S., Ltd. @. 14 
