Var. longifolia n var. 
140 
Caitlis gracilis humilis, internodiis 3—5 cm longis. 
Folia angustissime linearia, 0,3— 0,5 mm lata, longissima 
(20—30 cm). Vagince 25—45 mm longa biauritæ. Peduncu- 
lus 20—30 cm longus spiraliter angustissime tortus. 
The involucral leaves of this Rnppia has the usual 
habit, but the lower leaves have longer sheaths and longer 
overreaching blades, in habit, therefore, much resembling 
Potamogeton ßl if or mis f Inxnriosns Hagstr. Characteristic 
is also the extremely narrow (1,5 mm) spire of the peduncle 
with very numerous windings. Fruit ovoid, 2,8 mm long, 
with recurved short beak. Anatomy of stem and leaves the 
same as in the. var. drepanensis. The plant is collected by 
R. C. Gunn (Hb. Uppsaliense). 
The extra- European Ruppias are till now but little 
studied. Beside the abovecited R. pectin ata, American authors 
have established two new N. American species: R. occident alis 
Wats. (1890), and curvicarpa Nels. (1899), the specific rank 
of which we, however, not now can discuss for want of 
material. But the below described from South America is 
a well distinguished species. 
Ruppia obtusa n. sp. 
Caulis teres subcrassus ramosus internodiis 10—40 
mm. longis. Folia angustissime linearia subcrassa, 80—100 
mm longa, obtusa, apice ipso denticulis minutissimis per- 
paucis (ad 10) instructa, vaginis longis (30—65 mm.) inferne 
paullo inflatis. Peduncuhis c:a 30 mm. longus, æqualis, 
post anthesin valde deorsum curvatus. Spica biflora. An- 
therce subovales. Pollen curvatum. Fructus subglqbosus, 
magnus, maturus 3,5 mm. longus, erostratus, semper bre- 
vissime (0,5—1 mm.) pedicellatus. 
Var. repens n. var. 
Humilis repens; vaginæ breviores; fructus paullo mi- 
nores esse videntur. 
