Part 6. JUNCACEAE 1: Rostkovia to Luzula - Species Plantarum ...

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SPECIES PLANTARUM — FLORA OF THE WORLD (2002)
1. Rostkovia magellanica (Lam.) Hook.f., Fl. Antarct. 1: 81 (1844)
Juncus magellanicus Lam., Encycl. 3: 266 (1789); Rostkovia sphaerocarpa Desv., J. Bot. (Desvaux) 1: 327, pl.
12, fig. 2 (1809), nom. illeg. T: Chile. Magallanes: Magellan Strait, P.Commerson s.n.; holo: P, photo
AAU; iso: P, US.
Rostkovia magellanica (Lam.) Hook.f. f. pumila Albov, Revista Mus. La Plata, Secc. Bot. 7: 353 (1896).
T: Argentina, Tierra del Fuego, left bank of Río Grande, 6 Mar 1896, N.Albov 808; holo: LP, photo NY; iso: SI.
Illustrations: F.G.P.Buchenau, in H.G.A.Engler, Pflanzenr. (iv.36) 25: 40, fig. 34 (1906); M.Barros,
Darwiniana 10: 306, fig. 8 (1953); H.Balslev, Brittonia 31: 244, fig. 1 (1979); H.Balslev, Fl. Neotrop.
Monogr. 68: 40, fig. 20, D-F (1996).
Map: H.Balslev, Brittonia 31: 245, fig. 2 (1979).
Perennials, loosely caespitose, 15–30 cm tall; rhizome erect or ascending, sometimes short
creeping, 1.5–2.5 mm diam., usually covered with brown 1.0–1.5 cm long scales inserted
0.5–1.0 cm apart. Stem 0.5–1.0 mm diam.; cataphylls 2–4 per stem, to 7 cm long, longitudinally
ridged, light brown, with smooth red-brown margins; rudimentary blade to 4 mm
long. Basal leaves 15–25 cm long, to 1 mm wide; tip acute; auricles c. 1 mm long, rounded;
blades straight, stiff, ±flat, slightly trigonous or canaliculate, narrowly grooved along abaxial
midrib. Flower bracts 2; lower bract long, herbaceous, 4 cm long; upper bract scale-like, to
1 cm long. Pedicel 1–3 mm long. Tepals equal, lanceolate, 6–7 mm long, dark reddish
brown, gradually scarious toward the margin, obtuse, seemingly acuminate because of the
involute scarious margins. Stamens c. 4.5 mm long; anthers c. 2.5–3.0 mm long, mucronate;
filaments linear, flat, to 3 mm long, usually shorter than anthers; style 3.0–4.5 mm long;
stigmas c. 2.5–3.0 mm long. Capsule c. 4 mm in diam., thick-walled, dark brown to black,
shining. Seeds oblong to ovoid, c. 1.2–1.7 × 0.7–0.9 mm, dark, almost blackish, glossy with
fine color pattern of longitudinal blackish rectangles. 2n=56, fide E.J.Beuzenberg &
J.B.Hair, New Zealand J. Bot. 21: 15 (1983). Fig. 1.
Rostkovia magellanica occupies a wide and very disjunct range: New Zealand main islands
and Antipodean Is., South Georgia, Falkland Islands, southernmost Chile and Argentina, and
Ecuador. 51: ATP, NZS. 83: ECU. 85: AGS, CLS. 90: FAL, SGE. Mossy bogs and wet
depressions, from sea level (in the south) up to 3400 m (in Ecuador). Map 1.
51. ANTIPODEAN IS.: Campbell Is., Mt Lyall, 19 Dec 1975, D.R.Given 9173 (K); Campbell Is., Dec 1840,
J.D.Hooker 640 (K). 83. ECUADOR: Morona–Santiago, between Alao and Huamboya near pass, 3550–3950 m,
B.Øllgaard et al. 38239 (AAU, F, MO, NY, QCA); S.Laegaard 55422 (AAU, QCA, W). 85. ARGENTINA
SOUTH: Argentina, Patagonia, Río Fosiles, N of Lago San Martín, 1000 m, 6 Jan 1909, C.J.F.Skottsberg s.n.
(UPS); Santa Cruz, Lago Argentino, Brazo Onelli, 660 m, F.B.Vervoorst 4632 (K, LIL); Tierra del Fuego,
Sierra Alvear, Paso Garibaldi, 800 m, D.M.Moore 1587 (K). CHILE SOUTH: Tierra del Fuego, Estancia
Camerón, Campo Zapata, 21 Mar 1964, D.M.Moore 1114 (K); Tierra del Fuego west, Fjordo Agostini, 22 Feb
1929, H.Roivainen s.n. (H). 90. FALKLAND IS.: Port Stanley, Mt Williams, 28 Feb 1904, S.Birger (LD).
SOUTH GEORGIA: Cumberland Bay, Darthmouth Pt., 2 Jan 1959, W.Bonner 95 (BM); King Edward Point,
28 Feb 1957, Smith 1074 (K).
2. Rostkovia tristanensis Christoph., Results Norweg. Sci. Exped. Tristan da Cunha
11: 3 (1944)
T: Tristan da Cunha, above Soggy Plain, 1100–1200 m, 19 Feb 1938, Y.Mejland 1516; holo: O, photo NY; iso:
BM, GH, K, LD, O, S.
Illustrations: E.Christophersen, Res. Norweg. Sci. Exped. Tristan da Cunha 11: 4 and 5, figs. 2, 3 (1944).
Perennials, loosely caespitose, to 16 cm tall; rhizome creeping to ascending, often
stoloniferous, covered with scales; stems erect, rigid, 0.7–1.0 mm in diam.; cataphylls
coriaceous, with two prominent veins, to 3–5 cm long; rudimentary blade to c. 2 mm; basal
leaves usually to 10–12 cm long, 1.2–1.7 mm wide, flat, canaliculate, arcuate to circinnate,
subobtuse to subacute. Flower bracts 2; lower bract 1.2–1.9 (–2.5) cm long; upper bract
slightly shorter to ±equalling perianth. Pedicel short. Tepals subequal, lanceolate,
castaneous-brown; margins membranous-stramineous, ±involute; outer tepals 8–10 mm long;
inner tepals7–9 mm long. Stamens 5–6 mm; anthers c. 2 mm long; filaments to 4 mm long;
style 1.5–2.0 mm; stigmas 1.5–2.5 mm. Capsule obovoid, 4.5–5.5 mm long, ±brown, shining
to dull. Seeds narrowly ovoid, 1.0–1.2 mm long, shining, with fine longitudinal pattern.