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

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SPECIES PLANTARUM — FLORA OF THE WORLD (2002)
long, slightly smaller than male; tepals 6.5–7.0 mm long, more broadly lanceolate; ovary
turbinate; style c. 3 mm long; stigmas not exserted or slightly so, 1.0–2.5 mm long. Capsule
unilocular, ellipsoid to oblong-obovoid, rounded at the apex, 4.0–5.0 mm long. Seed
ellipsoidal, c. 0.8–1.0 mm long.
Endemic to the west of Argentina, in the Cuyo Region, San Juan Province, and La Rioja
Province. 85: AGW. Humid bogs and slopes, wet plains and stream banks in high elevations,
above 4000 m. Map 9.
85. ARGENTINA NORTHWEST: San Juan, Cuyo, Cordillera de Colanguil, Los Champones, A.Castellanos
s.n. (W, isosyn., duplicates of LIL16042 & 16133); San Juan, Reserva San Guillermo, Mina Los Caranchos,
4000 m, Pujalte 103 (SI).
4. Oxychloë haumaniana (Barros) Barros, Darwiniana 10: 303 (1953)
Andesia haumaniana Barros, Lilloa 23: 419 (1950). T: Argentina, San Juan, Río Cura, 3900 m, 16 Feb
1950, A.Castellanos; holo: LIL16136.
Illustrations: M.Barros, Darwiniana 10: 304, fig. 7 (1953); M.Barros, Lilloa 23: 419, fig. 3 (1950).
Dense perennials, cushion-forming, 5–10 cm tall. Stem erect, much branched, covered with
old sheaths, with living leaves only in distal part. Leaves imbricate, imperfectly distichous;
sheaths brownish, 10–50 mm long, 4–7 mm wide; auricles asymmetrical, ligulate,
membranous; blade narrowly cylindrical, rigid, surface minutely striate, 10–15 mm long,
1.0–1.2 mm wide; tip prickly. Bracteoles unequal; lower bracteoles subacute, 4–5 mm long,
shortly mucronate; upper bracteoles subobtuse, c. 2.5 mm long. Flowers hermaphrodite or
unisexual; perfect flowers on short peduncle, scarcely overtopping leaves; tepals acute,
narrowly lanceolate, brownish-purplish with scarious margins, subequal, c. 5 mm long.
Stamens 6; anthers c. 2.5 mm long, mucronulate; filaments 0.5–1.0 mm long. Unisexual
flowers similar to the perfect ones, lacking one of the fertile whorls. Capsule hard-walled,
ovoid, brownish, 8–10 mm long. Seeds obovoid, reticulate, whitish, 0.7–0.9 mm long.
Rare, endemic to San Juan Province in Argentina; known from the type collection only.
85: AGW. Wet slopes and plains in high Andes, at 3900 m. Map 10.
Similar to O. bisexualis but differs in having shorter leaf blade, up to 15 mm long, and
smaller flowers, usually less than 5 mm.
5. Oxychloë mendocina Barros, Lilloa 28: 282, fig. 2 (1957)
T: Argentina, Mendoza, Tristeza, China Muerta, 23 Feb 1953, A.Castellanos; holo: LIL15365.
Illustration: M.Barros, Darwiniana 10: 304, fig. 7 (1953).
Dense perennials, compact, cushion-forming, usually to 8–10 cm tall. Stem erect, much
branched, with basal internodes covered with old sheaths and fresh leaves only in the most
distal part. Sheaths with membranous margins, 3–5 cm long; auricles forming a bilobed
ligule; blade cylindrical, tapered into pugent apex, 4–6 cm long, 1–2 mm wide. Bracteoles
unequal, ovate, membranous; lower bracteoles 4.5–5.0 mm long. Flowers hermaphrodite or
unisexual, with the former on long filiform peduncules 3–5 cm long. Tepals lanceolate,
purplish-castaneous, with margins membranous, subequal; outer tepals 7 mm long; inner
tepals 7.5–8.5 mm long. Stamens 6; anthers mucronulate, 4.0–4.5 mm long; filaments
0.3–0.5 mm long. Female flowers with filiform staminodes; ovary turbinate; style c. 2 mm
long, large; stigma exserted, c. 4–5 mm long. Capsule ovoid to ellipsoidal, 7.0–7.5 mm long,
shorter than perianth. Seeds ellipsoidal, 0.8–0.9 mm long.
Endemic to Mendoza Province, W Argentina. 85: AGW. Humid bogs and springs, usually
above 3500 m. Map 11.
85. ARGENTINA NORTHWEST: Mendoza, between Portezuelo de Rahuí and valley of Chacaycó, F.Kurtz
6071 (CORD); Arroyo del Papel, 3000 m, F.Kurtz 11127 (CORD); Mendoza, San Carlos, Laguna del
Diamante, A.Ruíz Leal 14561 (K).