Juncus subg. Genuini

Buchenau

Abhandlungen herausgegeben vom naturwissenschaftlichen Vereine zu Bremen 4: 406. 1875.

Synonyms: Juncus sect. Genuini (Buchenau) Dumortier Juncus sect. Juncotypus Dumortier Juncus subg. Juncotypus (Dumortier) Kreczetowicz & Gontscharow
Treatment appears in FNA Volume 22.

Herbs, perennial, rhizomatous. Culms terete. Leaves basal; blade usually absent, rarely present (J. hallii and J. parryi), if present terete, channeled, not septate. Inflorescences lateral cymes, sympodial; bracts erect, terete, appearing to continuation of culms; bracteoles 2, at base of perianth. Flowers borne singly, not in heads. Capsules 3-locular. Seeds usually not tailed.

Discussion

Species ca. 25 (11 in the flora).

Key

1 Flowers 1–3(–5); seeds tailed. > 2
1 Flowers more than 5. > 4
2 Leaf blade reduced to bristle Juncus drummondii
2 Leaf blade well developed. > 3
3 Perianth 6–9 mm; capsules oblong, acute Juncus parryi
3 Perianth 4–5 mm; capsules ovoid, retuse Juncus hallii
4 Culms well spaced along sparingly branched creeping rhizomes. > 5
4 Culms tufted on short, densely branching rhizomes. > 8
5 Anthers shorter than filaments; tepals greenish; capsules green to light brown Juncus filiformis
5 Anthers equal to or longer than filaments. > 6
6 Fruits acute. > 7
6 Fruits obtuse Juncus textilis
7 Perianth usually 3–6 mm Juncus arcticus
7 Perianth (5–)6–8 mm Juncus lesueurii
8 Stamens 3 Juncus effusus
8 Stamens 6. > 9
9 Plants cespitose, stooling; capsules 3–4 mm Juncus inflexus
9 Plants cespitose, not stooling; capsules less than 3 mm. > 10
10 Perianth much shorter than capsule; seeds 0.7–1 mm Juncus gymnocarpus
10 Perianth equal to or exceeding capsule; seeds 0.4–0.5 mm Juncus patens
... more about "Juncus subg. Genuini"
persistent +
Ralph E. Brooks* +  and Steven E. Clemants* +
Buchenau +
channeled;terete +
Worldwide +
arranged +  and cluster +
headlike +
pseudoaxillary +  and terminal +
3 +  and 1 +
green;brown or purplish black +
persistent +
parietal +  and axile +
Abhandlungen herausgegeben vom naturwissenschaftlichen Vereine zu Bremen +
ahti1980b +, fernald1910b +  and stace1970a +
green;brown or purplish black +
persistent +
3 +  and 6 +
generally longer +
Juncus sect. Genuini +, Juncus sect. Juncotypus +  and Juncus subg. Juncotypus +
Juncus subg. Genuini +
subgenus +