Juncus articulatus L. [Familia Juncaceae]

Descripción y datos generales

Publicación original

L. (1753). Sp. Pl., 1, 327.

Status

Naturalizada

Hábito

Hierba

Ciclo de vida

Perenne

Descripción morfológica

Herbs, perennial, usually caespitose, 10?55 cm tall. Rhizome short, short-creeping, rarely with nodes elongated, 2–3 mm diam., not swollen. Stems usually erect, sometimes decumbent, submerged or growing in moving sand and rooting at nodes, terete, 1–3.5 mm diam., smooth. Cataphylls usually 1, rarely 2, maroon to straw-coloured, apex acute to obtuse. Cauline leaves 2–6, usually 3; leaf sheath auricles well developed, free part 0.5–2 mm, membranous, apex rounded, scarious; leaf blade green to straw-coloured, terete, 3–17 cm long, 0.5–2 mm wide, subacute, unitubulose, with perfect septa that are conspicuous externally. Inflorescences decompound, 2–12 long, 1.5–6 cm wide, terminal panicles of 6–55, obpyramidal to hemispheric, 4–10-flowered heads, each head 3–4 mm long, 3–9 mm wide; branches spreading, erectopatent; primary bract erect, shorter than the inflorescence, 1.5–4 cm long. Tepals maroon or straw-coloured, completely brown or with a green central band, ovate to lanceolate, usually equal, 2.5–3 mm long, 0.7–1.1 mm wide; outer tepals sometimes slightly longer, carinate, more or less narrowly bordered, varying in colour from green dorsally with darker lateral bands and apex dark brown or castaneous-coloured, acute or rarely subobtuse and mucronate; inner tepals obtuse to acute, mucronate, with distinct scarious margins. Stamens 6, anthers ca. 1 mm long, equalling filaments, rarely slightly longer or shorter. Style 0.3–0.7 mm long, stigmas to 1.5 mm long. Capsule exserted 0.5–1.5 mm beyond perianth, trigonous, ellipsoid or ovoid, imperfectly 3-locular, 3.8–4.2 mm long, castaneous to dark brown, glossy, apex acute proximal to beak, valves separating and apex slightly reflexed at dehiscence; rostrum ca. 0.3–0.5 mm long. Seeds obovoid, 0.5–0.7 mm long, reticulate, not tailed, yellowish, one of the ends dark brown coloured.

Material tipo

Herb. A. van Royen, L N 904.145–409 (lectotipo, L 0221767 [foto!], designado por P. P. Ferrer-Gallego, Taxon 68: 142-151. 2019).

Distribución

Distribución por país

Referencias bibliográficas por País

Vouchers — Ejemplares examinados

Colecciones de referencia

Registros de herbario determinados actualmente con este nombre.

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Estado de conservación