218 MR. W. B. HEMSLEY ON ‘THE 
vegetation is not so sparse as in many parts; but its size could 
not be determined from a detached branch. Hippophaé Rham- 
noides, L., like Caragana, is only from the Plaius of Gugé, where 
it was collected by Strachey and Winterbottom. One species of 
Salix from the Goring Valley and another from the Plains of 
Gugé and Ephedra Gerardiana complete our list of woody plants. 
The willows are represented only by very small specimens. The 
Ephedra is perhaps the most woody of all, having very stout 
root-stocks and trailing branches a quarter of an inch thick ; it 
is common in Western Tibet at elevations between 16,000 and 
17,000 ft. The absence of Juniperus from all the collections is 
remarkable. 
FLESHY-LEAVED PLANTS. 
With the exception of the Crassulacew—Sedum and Semper- 
vivum, of which there are ten species—fleshy plants are rare in 
Tibet. The species of Sedum inhabiting the Himalayan and 
Tibetan regions are in need of revision, consequently we are not 
quite sure of our names iu all instances. Several species are 
apparently not uncommon in the west, and the species we have 
named quadrifidum with some doubt was collected in very distant 
localities, and as far eastward, at least, as the ninetieth meridian. 
LARGE-LEAVED PLANTS. 
Rheum spiciforme, Royle, is the only plant having leaves of 
considerable surface ; but the specimens collected probably do 
not bear the largest produced by this species. The blade of the 
largest leaf is only about four by three inches. Still, in certain 
districts, of considerable area, this plant must be very conspicuous 
in the vegetation. Kew possesses specimens collected by 
Przewalski, Hedin, the Littledales, and Deasy and Pike in very 
distant localities. Pike notes that it was plentiful over an area 
of about two square miles in 81° 41' and 34° 52’, and ‘‘seen once 
or twice afterwards, but not common.” Further particulars of 
this plant are given under “ Useful Plants.” 
Aquatic and Marsu Prants. 
. Ranunculus aquatilis, Hippuris vulgaris, Myriophyllum vertt- 
cillatum, and Potamogeton pectinatus are the only true aquatics 
in the Kew collections, and each one is in only one collection. It 
seems highly probable that the freshwater lakes and water- 
courses have not been exhausted in this direction. Marsh plants 
