Juncus species

Jung, Ming-Jer, 2013, Juncus kuohii (Juncaceae), a new species from Taiwan, Phytotaxa 81 (2), pp. 49-54 : 53

Key to the Juncus species in Taiwan (*alien and naturalized species)

1. Leaf blades absent or extremely reduced; leaves all basal .......................................................................................... 2

- Leaf blades present and obvious; leaves basal and/or cauline...................................................................................... 3

2. Culms thicker than 2 mm; cymes with 100–150 florets .............................. J. decipiens (Buchenau) Nakai (1928: 35)

- Culms narrower than 1 mm, cymes with 10–30 florets............................................ J. tobdeniorum Noltie (1998: 42)

3. Basal and cauline leaf blades laterally compressed .................................... J. leschenaultii Gay ex Laharpe (1825: 49)

- Basal and cauline leaf blades flat, terete or filiform .................................................................................................... 4

4. Basal and/or cauline leaf blades conspicuously flat .................................................................................................... 5

- Basal and/or cauline leaf blades terete or filiform........................................................................................................ 7

5. Inflorescence cymose................................................................................................................................. * J. bufonius

- Inflorescence racemose................................................................................................................................................ 6

6. Outer tepals ovate, shorter than 5 mm, outer and inner tepals similar, apex acuminate; capsule globular .................... .................................................................................................................................. * J. marginatus Rostk. (1801: 38)

- Outer tepals lanceolate to narrowly ovate, longer than 5 mm, outer tepals with apex mucronate, inner with apex obtuse; capsule ellipsoid ................................................................................................................................... J. kuohii

7. Leaf blades cylindrical, septate, not grooved on adaxial surface... J. wallichianus J. Gay ex Laharpe (1827: 139)

- Leaf blades terete or filiform, not septate, with a single groove on adaxial surface .................................................... 8

8. Culms shorter than 10 cm; tepals longer than 5 mm ........................................ J. maximowiczii Buchenau (1890: 394)

- Culms taller than 15 cm; tepals shorter than 4 mm ..................................................................................................... 9

9. Leaf blades canaliculate to nearly terete near the apex; capsule exceeding tepals; margins of leaf sheaths hyaline ..... ................................................................................................................................ * J. imbricatus Laharpe (1825: 61)

- Leaf blades flat; capsule shorter than tepals; margins of leaf sheaths herbaceous ............. J. tenuis Willd. (1799: 214)