450 MR. G. BENTHAM ON COMPOSIT X. 
bution. Its five species have been published as so many separate 
genera, but never appear to have been compared with each other. 
The original typical species is a creeping maritime plant from 
Buenos Ayres with rayless capitula ; Coinogyne, a maritime Cali- 
fornian plant, is scarcely to be distinguished from it except by its 
radiate capitula; Espejoa is a Mexican species, with an erect 
branching stem and radiate capitula; Chethymenia is another 
erect branching Mexican species with radiate capitula, but with 
much less obtuse involucral bracts. Hypericophyllum, from $. 
tropical Africa, closely resembles Chethymenia; but the capitula 
are rayless as in the typical Jaumea, and the leaves, though entire 
glabrous and rather thick as in the other four, are broader. If 
all these had been found in the same district, no one would have 
doubted their being congeners; and had any of them, in its own 
special locality, diverged into allied forms different from those of 
the distant species, we might have admitted them, as distinct 
genera upon very slight characters ; but as none have any near 
connexions in their own district, we must conclude that they are 
all really congeners with the scattered distribution, hitherto un- 
accounted for, of Melasma, Alectra, and others. 
Venegazia, a monotypic Californian genus thus associated with 
Jaumiex, appears in some respects to approach Anthemides in 
structure; but the involucre, the achenes, and the pappus, as well 
as the geographical position, are those of Helenioidex. Olivea 
is another monotypic genus of the Mexican region, but rather 
more nearly connected with normal Helenioidez. 
7. Anthemidee. 
Anthemides, with very few exceptions, are essentially of the 
Old World, chiefly extratropical, and far less varied than the two 
preceding tribes. About 650 species are contained in forty genera ; 
and several of these seem to pass into each other. It is not easy, 
either, to group them into well-marked subtribes ; and, as in the 
case of Asteroides, it will be necessary to consider a few of the 
principal genera as centres of groups round which others are more 
or less divergent. As a whole, Anthemidew are remarkably 
constant in their tailless anthers and truncate style-branches ; and 
their pappus, either very shortly paleaceous or coroniform or 
entirely wanting, has but very few exceptions. Their habit and 
involucre often connect them with Asteroidee on the one hand 
and Arctotidee on the other ; but their style readily distinguishes 
