Plate 57. 
Fig. 1.— ROSTKOVIA GEANDIFLORA. 
Figs. 2-5.— ROSTKOVIA MAGELLANICA. 
Family, Juncaoe^ (Rush) : — Nerves of the leaf parallel. Parts of 
the flower usually in twos or threes. Perianth stiff or calyx- 
like. Capsule 3-celled. 
Genus, Rostkovia : — A rush-like plant, with one narrow, terete leaf. 
Flower solitary and terminal. Bracts 1-3, scaly. Perianth 
segments distinct, narrow, erect, rigid. Stamens 6, below the 
ovary. Anthers erect, attached to filament at base, filament 
short. Style subulate, divided into 3 narrow stigmas. Ovary 
1-celled. Capsule globose, ovoid or oblong, tough, divides into 
3 valves. Seeds numerous, small. 
Rostkovia grandiHora, Hooh. f. Plant about 12 in. 
high, rigid, branched. Culm with one radical leaf, sheathing 
at the base and terete. Sepals 6, narrow, awl-shaped, unequal 
in length, brownish, 3 bracts at base. Stamens shorter than 
the sepals, purple. Anthers oblong. Filaments short. Stigmas 
green. Capsule 1-celled, oblong with a pointed apex. 
Abundant, thriving best in moist situations. 
Flowers November. 
East and West Falklands. 
Rostkovia magellanica. Hook /. Plant about 8 in. high. 
Culm compressed. Leaves radical, flat, sheathing, longer 
than the stem. Flower subtended by 1 long bract. Perianth 
leaves not all equal, narrow, pointed. 
Marshy ground. Common. 
Flowers October. 
East Falklands. 
Description of plate : — 1, R. grandiflora, plant and stock. 2-5, R. 
magellanica : 2, whole plant ; 3, flower ; 4, fruit ; 5, seed. All except 
1 and 2 enlarged. 
