3 
stands ont markedly from the rest, and even in that case the 
concept of the group rests largely on an external character 
(junciform leaf-blades), of which the anatomical character is 
but a paraphrase. Apart from this group, the anatomical 
structure of the leaf-blades varies on the whole within narrow 
limits, so that it will frequently be found useful as an ancillary 
character. To introduce these anatomical details into the Key, 
eyond the most marked instances, would have encumbered it 
unnecessarily without adding more than can be gleaned from 
the figures, which are at least as expressive as a description 
For the same reason I have advised Miss Hughes to desist from 
the incorporation of anatomical matter in her descriptions of 
new species. 
The concurrent numbering of the species in the Ke 
Enumeration and of the figures will materially facilitate reference 
to the latter. 
It was very tempting to extend the study to the problem of 
the relationship of the Australian Stipe with their congeners 
in other parts of the world, the more so as the distribution of 
Stipa is very singular, but to do so would have entailed the 
revision of a larger amount of material and literature than was 
feasible. It may suffice to state in this place that there is no. 
evident connection with the only undoubtedly indigenous South 
species are closely linked up with the Mediterranean S. tortilis. 
O. STapF. _ 
Key TO THE GROUPS AND SPECIES. 
The numbers of the species in the Key correspond to those 
of the Enumeration and of the figures. (The letters after the 
numbers on pp. 19 and 29 should read A instead of a in accord- 
ance with the quotations in the text.) ‘ 
Valvule very small, rarely half as long 
as the valve, this glabrous or slightly 
hairy at the base, minutely scabe- 
rulous upwards; leaf-blades flat 
or involute without a continuous 
sclerenchymatic hypoderma, girders 
all percurrent or alternately per- 3 
current and interrupted = - - I. Micropaleatae. 
Valvule as long as the valve or almost 
so; valve silky hairy mostly all 
oo 
along : 
Hyaline margins of the valve pro- 
duced at the tip into a small lobe 
on each side of the awn, lobes 
acute or acuminate, not less 
than 0:5 mm. long: ; 
