NEW POTAMOGETONS 151 
Hab. Casa Bamba, Siena chica de Cdédrdoba, Cdédrdoba, 
Argentine a January, 1909. Dr. Teodoro Stuckert. 
n. 19877 pro part 
One of the mi remarkable species of the section Coleophyllit, 
in habit much like one of the gramineus group; in fact, on first 
looking at the specimen, I mentally said, ‘near P. aytt.” “A 
portion of a graminifolius species, P. Berteroanus Phil., is mixed 
with it, gathered by the collector, no doubt, as sa 
Another specimen, under fhe. same number, is P. Berteroanus. 
e of w the dissimilis enna either can it 
placed with P. iariatas oe et Pavon (P. pamiricus Baagoe), or 
any other species known to me. To a Reine extent it accords with 
specimens (wanting peek « or fruit) from South Australia, gathered 
by Mr. Tepper, but they seem to belong to P. interruptus Kitaib. 
ll the other species of this section agree mainly in the habit 
peculiar to the section; but this plant simulates in habit the 
graminifolius series, especially St pb Rupr. 
Potamogeton Henningii, sp. nov.—A specimen under the 
name of P. zosterifolius oe (“ex herb. horti Petrop. In 
stagnis prope sylvi L. Marian. leg. Henning”), gathered by 
Henning before 1893 j in the Catabseae 4 is not shave species. 
The stem is half the usual thickness of — much less 
compressed, stipules half the length, 1-2 cm., and excurrent in a 
long point. Leaves 1 dm. long by 4 mm. waite: enbeal nerves con- 
sisting of six closely compacted nerves, with numerous connecting 
erves at right angles, 
nerves (in zosterifolius there are four major nerves and twenty 
minor nerves) ; immature fruit much like that of acuwtifolius Link, 
but ae erences ed on the central carina. 
ing published (Mem. Soc. Nat. Moscow, vi. (182 
61-93) a ‘cae entitled “‘Observationes de plantis tanaicensibus,” 
in which he enumera os anerogams. 
n 
Indiana, U.S.A., Mrs. “Agnes Chase, 1900,” the "fruit is very 
“Se de “forma fructibus iis P. acutifolii similibus est.”+ In 
specimens of the fruit of zosterifolius, from its area of aa 
tion Asdioh is, of course, some ger In Ja 
oscar examples the leaf-apex and general contour of the be plant 
more nearly resemble P. acutifolius, while the majority of those . 
of North America approximate more to the general run of Euro- 
pean specimens. 
cena sks NACI 
us ie Geol. Expl., 40th Parallel, Pome (1871), 338. 
+ In Ber. Bayr. Bot. Ges. xi. (1907), 93 
