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

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SPECIES PLANTARUM — FLORA OF THE WORLD (2002)
Northern regions of Siberia and the Russian Far East, Kamchatka, Alaska and NW Canada.
30: KRA, YAK. 31: KAM, KHA, KUR, MAG. 70: ALU, ASK, NWT, YUK. 71: BRC.
In drier tundra, and on rocky slopes. Map 76.
30: KRASNOYARSK: Taymyr, Syndasko R., N.S.Vodop’yanova 412 (PRA). YAKUTIYA [SAKHA]:
Bulkur, 1898, H.Nilsson s.n. (LD); Balganach, 1898, H.Nilsson s.n. (LD). 31: MAGADAN: Chukotka,
15 km SSW of Provideniya, 23 Jun 1992, A.Svensson (S). 70: ALEUTIAN IS.: Akutan, Norberg 71 (S);
Amlia Is., W.J.Eyerdam 1234 (BM). ALASKA: Alaska Range Distr., Dry Ck, c. 1100 m, A.Viereck & Jones
5772 (S); Pribilof Is., St. Paul, E.Hultén 7459 (S); Brooks Range, De Long Mtns, Liberator Lake, K.Holmen &
O.Mårtensson 61-1640 (UPS); Port Clarence, Teller Reindeer Station, B.A.Walpole 1963 (K).
NORTHWEST TERRITORIES [Nunavut]: Mackenzie R. Delta, Kittigaznit Is., A.E.Porsild & R.T.Porsild
2333 (S); Tungsten, Marris 11225 (BM).
The accepted name has often been misinterpreted for plants of the sect. Luzula. For
discussion, see L.Hämet-Ahti & Virrankoski, Ann. Bot. Fenn. 8: 157–158 (1971).
47. Luzula arcuata (Wahlenb.) Sw., Summa Veg. Scand. 13 (1814)
Juncus arcuatus Wahlenb., Fl. Lapp., p. 87, tab. 4, 1812, nom. conserv. propos. [nom. illeg., Juncus
pediformis Chaix in syn.]; Juncoides arcuata (Wahlenb.) Druce, Bot. Soc. Exch. Club Brit. Isles 8: 85 (1929).
T: Sweden, Piteå Lappmark på Örfjället, 6 Sep 1807, G.Wahlenberg; lecto: UPS, fide Moberg & Nilsson,
Nord. J. Bot. 11: 293 (1991). [further authentic material: S, UPS, WU].
Map: E.Hultén & M.Fries, Atlas N. Eur. Vasc. Pl. 1: map 168 (1986).
Perennials, sparsely hairy, with ascending rhizomes and short stolons. Leaves subabruptly
narrowing to acute tip. Basal leaves usually up to 4 mm wide. Stem usually 0.3–0.5 mm in
diam. Lower bract membranous-brownish, usually 3–8 (–15) mm long. Inflorescence
corymbose, composed of 3–17 few-flowered glomerules usually as long as wide or wider;
peduncles with secondary branches, capillary, usually c. 0.2 mm in diam., arcuate or
nodding. Stamens 6. Seeds narrowly ellipsoidal; appendage absent or up to 0.15 mm long;
base fibrillate.
Arctic regions of Europe; the Arctic and mountains of N Asia; N America from Washington
and British Columbia northwards; Japan, Korea and, probably, China. Rocky or gravelly
places. Two subspecies are recognized.
Basal leaves up to 2 mm wide; seed appendage lacking
Basal leaves more than 3 mm wide; seed appendage developed,
47a. subsp. arcuata
to 0.15 mm long 47b. subsp. unalaschkensis
47a. Luzula arcuata (Wahlenb.) Sw. subsp. arcuata
Luzula arcuata f. capillaris Laest., Bot. Not. 1858: 144 (1858). T: Sweden, Pite Lappmark, "Njepusurte i
Piteå Lappmark", L.L.Laestadius; syn: n.v.; [Norway, Finnmark] Koutokeino, L.L.Laestadius; syn: n.v.
Illustration: J.Lid, Norsk & Svensk Fl. 203, fig. 100a (1963).
Perennials up to 15 cm long, sparsely hairy to glabrescent, loosely caespitose, with branched
creeping or ascending thin rhizome and ascending stolons. Basal leaves canaliculate, up to
5–7 cm long, up to 1.5–2.0 mm wide, subabruptly narrowing to acute tip; plant base brownish
to purplish, slightly lustrous; cauline leaves 1 (–2), usually 1.5–2.0 (–3.0) cm long, to 1.2 mm
wide; stem thin, usually less than 0.5 mm in diam. below inflorescence. Lower bract
membranous, often suffused brownish, 3–5 mm long, ciliate above. Inflorescence lax,
corymbose, composed of (3–) 5–15 small glomerules; peduncles smooth, thin, c. 0.2 mm long,
arcuate and nodding, up to 1.5–2 cm long, often branched (secondary branches usually 1–3);
glomerules c. 4 × 3.5–6 mm, usually (1–) 2–5 (–8)-flowered, often with some flowers with
visible peduncles. Bracteoles 1.0–1.2 mm long, ovate, brownish below, scarious and fimbriateciliolate
above. Tepals ±equal; outer tepals acuminate; inner tepals ±mucronate or acute, deep
brown, usually 2.0–2.2 mm long. Stamens 6; anthers 0.4–0.6 mm long; filaments c. 0.3 mm
long; style 0.4–0.5 mm long; stigma 1.1–1.3 mm long. Capsule ovoid to ellipsoidal, slightly