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

JUNCACEAE (Luzula)
1908, F.Kurtz 15129 (CORD). ARGENTINA SOUTH : Chubut. Tehuelches, Lago Vintter, 29 Jan 1995,
E.Nicora 10083 (SI); Neuquén, Ñorquín, Copahué, 2000 m, C.A.O’Donnell 110458 (SI).
A variable species with its highest diversity in N Argentina. Luzula castellanosii seems to be
a depauperate, narrow-leaved form of L. excelsa.
34. Luzula mendocina Barros, Darwiniana 10: 322 (1953)
T: Argentina, Mendoza, Tunuyán, Cerro de las Piedras, 2220 m, 23 Mar 1935, A.Ruíz Leal 3105; lecto:
LIL46294A, designated here; isolecto: LIL46294B.
Illustration: M.Barros, Darwiniana 10: 323, fig. 12 (1953).
Perennials 25–60 cm tall, sparsely hairy caespitose; rhizome short; stolons absent. Basal
leaves usually 12–15 cm long, 3.5–6.5 mm wide. Cauline leaves 2–3; upper ones usually
short, 3–6 cm long, 2.5–3.5 mm wide. All leaves acute-subulate; margins with sparse reddish
papillae. Primary bracts herbaceous, of variable length, usually 2.5–5.0 cm long.
Inflorescence panicle composed of remotely interrupted, relatively dense, long pedunculate
secondary panicles. Secondary panicles 2–4 × 1–2 cm, with lowermost often 10–15 cm below
terminal one, of 3–10 spike-like dense clusters. Bracteoles scarious-membranous, 1–2 mm
long, ±lanceolate, not or sparsely ciliate. Tepals subequal, entire, glabrous, lanceolate,
acuminate; inner tepals 2.0–2.5 mm long; outer tepals 2.1–2.8 mm long. Stamens 6, rarely
1 or 2 rudimentary; anthers 0.6–0.8 mm long; filaments 0.3–0.4 mm long; style 0.3–0.4 mm
long; stigmas 0.8–1.1 mm long. Capsules narrowly ovoid, ±acute, brown, shining, shorter
than perianth; capsule segments 1.5–1.7 × 1.0–1.1 mm. Seeds oblong-ovoid, c. 0.8–1.0 mm
long, 0.6–0.7 mm wide; appendage indistinct, base fibrillate.
Central Argentina (Mendoza, Cordoba, San Luis and Buenos Aires provinces). 85: AGE,
AGW. Mountain grasslands, 700-3000 m. Map 64.
85. ARGENTINA NORTHEAST: Buenos Aires, Sierra de la Ventana, Partido de Tornquist, Cerro de la
Nerilana, 24 Mar 1948, A.L.Cabrera 54 (SI). ARGENTINA NORTHWEST: Mendoza, Tunuyán, Cuchilla
del Cerro Bayo, 3000 m, A.Ruíz Leal 3085 (para: LIL); Tunuyán, Rincón Colorado, 3000 m, A.Ruíz Leal 1279
(para: LIL46292A, B); Tunuyán, Las Cuevas, A.Ruíz Leal 3195 (LIL); Tunuyán, Bella Vista, 2300 m, G.Covas
(SI18003); San Luís, La Carolina, A.Burkart 10777 (SI); Córdoba, Pampa de Achala, 13–14 Dec 1945,
A.T.Hunziker 6425 (CORD).
Distinct in having several, long pedunculate, ±dense secondary panicles ('heads'); it is unique
in this respect among hexandrous taxa.
35. Luzula masafuerana Skottsb., Nat. Hist. Juan Fernandez 2: 775 (1953)
Luzula racemosa subsp. insularis Skottsb., in C.J.F.Skottsberg, Nat. Hist. Juan Fernandez 2: 110 (1922);
Luzula insularis (Skottsb.) Skottsb., Veröff. Geobot. Inst. Rübel Zürich 3: 89 (1925), nom. illeg., non (Briq.)
Prain (1921). T: Juan Fernández, Masafuera, Las Torres, 1100–1350 m, C.J.F.Skottsberg & I.Skottsberg
408; lecto: S, designated here; isolecto: BM, K, LD, UPS.
Illustration: C.J.F.Skottsberg, in C.J.F.Skottsberg, Nat. Hist. Juan Fernandez. 2: 110, fig. 5, b-e (1922).
Perennials up to 35–40 cm tall, robust, densely hairy caespitose; rhizome short; stolons
absent. Basal leaves usually 4–7 cm long, 4–9 mm wide, flat; cauline leaves 2 (–3), usually
(3–) 5–7 cm long and 3.5–5.0 mm wide; all leaves acute, with papillose-serrulate margins.
Lower bracts herbaceous, usually 2.5–6.0 cm long, exceeding inflorescence. Inflorescence
erect to slightly bent, congested, compact, lobulate, or subdivided in 2–3 ovoid clusters and
±elongated, 2.0–3.5 (–4.0) cm long. Bracteoles ±ovate, membranous, 1.0–1.5 mm long,
densely fimbriate-ciliate. Tepals ±equal, lanceolate, distinctly acuminate, 2.2–3.0 mm long,
±brown, ±glabrous to very sparsely ciliate. Stamens 3; anthers 0.3–0.6 mm long; filaments
0.5–0.6 mm long; style c. 0.3 mm long; stigmas 1.0–1.2 mm long. Capsule ±ovoid, subacute,
castaneous brown; capsule segments 1.7–2.0 × c. 1.3 mm. Seeds ellipsoidal, brown, 1.0–1.1 mm
long, 0.6–0.7 mm wide; appendage absent; base fibrillate.
Endemic to the Juan Fernández Is. 85: JNF. Found on rocks and rocky slopes. Map 65.
85. JUAN FERNÁNDEZ IS.: Masafuera, N slope of Quebrada Casas, 900 m, 17 Jan 1986, T.Stuessy et al.
9048 (OS); Quebrada de las Casas, ladera mirando al Sur Riscos, Muñoz & E.Sierra 7400 (OS); Masafuera,
Quebrata Pasto, 1060–1100 m, 29 Jan 1986, T.Stuessy 9411 & T.Lammas (OS); Masafuera, Las Torres,
73