NOTES ON POTAMOGETON 15 
assez d’eau) retulit specimen haud floriferum cui folia omnia sub- 
mersa, oblonga, basi attenuata, subpetiolata, acuta et brevissime 
obtuse mucronata, nervo medio basi crassissimo usque in mucronem 
excutrente, margine tenuiter serrulata, 33 poll, longa, 7-8 lin 
lata. Stipule in setas secedunt. Rete set sincil ay = in bucenti” u 
Mr. J. G, Baker (FU. Mauritius, 392) mentions P. 
Mauritian species; I believe the same plant is leu tae as I ‘find 
it placed sometimes with crispus and sometimes with lucens in 
herbaria, while I have never seen true P. crispus from that island. 
Bojer (Hort. Maurit. p. 858 (1837) gives P. tuberosum Roxb. 
which I now describe. Placed by the side of the Jucens he knew 
thence and also from apes tee it would appear more like erispus 
than any other specie 
Pano ee is not sin ‘record, save as above, from any Mascarene 
isla nd, n r from any of the other African islands, being in Africa 
aaaitay continental. In Asia it is recorded from Sumatra! (a 
relic of a former connection with the aN 3 *) the Loo Choo 
isles !, and has been - lately found 3 in Formosa!. In Australasia it 
is not recorded from any of the Polyhatiair'o or Australian groups of 
islands, oo, from the mainland. 
Chamisso (/.¢.) mentions another plant, but his description, 
from a poor specimen sent ommerson, is insufficient. Neither, 
however, is his P. mascarensis (l.c. p. 228), which = P. iia’ L. 
h, brew sfen Kunth Enum. iii. 128 (1841). On the original 
Specimen of this Chamisso has written ‘rufescens,’’ which the 
lower leaves resemble. He remarks that in the Paris Herbarium it 
endemic form of either P. americanus Cham. or P. fluitans Roth. 
e plant to sciriak I am calling a attention occurs in paciraiear 
Bourbon !, and Rodriguez !, and is, I believe, mre I pro 
pose to call it P. Chamissoi, and proceed to describe 
tems from a creeping rootstock, 8-4 ft. long, sien branched, 
often destitute of leaves for eighteen inches or more, Leaves very 
variable in length, 2-5 in. lo ong by 4-3 in. broad, lower sessile, 
alternate lance- linear to oblong-lanceolate, the margins strongly 
waved and recurved when dry, but not serrulate (occasionally there 
24-3 i = e ual; ikes we in. No fruit seen. 
: u oethinas Roxburgh, 1819 (as “ P. crispum”’). Roubillard 
(no date) i in Herb. Brit. Mus. ; “ In aquis lente fluentium in insul. 
Mauritii. W. Bojer, 1833,” in herb. C. de Candolle; Riviére de 
ae Ro 00 ft. above sea-level, July 7, 1889. H. H. Johnston. 
Mau ‘ 
* Wallace, Island: Life, ed. 2 (1892), 385. 
