Juncus tenuis var. platycaulos (Kunth) Buchenau
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Authority
Balslev, Henrik. 1996. Juncaceae. Fl. Neotrop. Monogr. 68: 1-167. (Published by NYBG Press)
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Family
Juncaceae
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Scientific Name
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Type
Type. Colombia. Tolima/Quindio: Mt. Quindio between Ibagué and La Palmilla, Humboldt & Bonpland s.n. (lectotype, P!, here selected, photo AAU!; isotype, MO!).
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Synonyms
Juncus platycaulos Kunth, Juncus coarctatus (Engelm.) Buchenau, Juncus andreanus Weath., Juncus pallidus R.Br.
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Description
Variety Description - Perennial cespitose herbs, to 70 cm tall. Rhizome densely branching. Culms smooth or sometimes slightly longitudinally ridged. Auricles ca. 0.5 mm long, wider than long, rounded, cartilaginous. Leaf blade terete or channelled, when channelled the central part of the x.s. is thicker than the edges, adaxial side with a narrow band of hyaline cells occupying less than 1/3 of the width. Inflorescence composed of several few- to many-flowered unilateral cymes, congested into one more or less dense head. Lower inflorescence bract usually filiform, flexible, obviously longer than the distal ones. Tepals not or only slightly recurving. Capsule thin walled, usually clearly shorter than the tepals when mature, valves not recurved along the seams and the capsule therefore not 3-keeled.
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Discussion
Distribution and Ecology: Juncus tenuis var. platycaulos occurs scattered in the Central American highlands, in the Andes from Venezuela to Ecuador, and apparently somewhat disjunctly in C Peru, but perhaps it is undercollected in N Peru. It grows in wet places, along streams, lakes, and roads, and in meadows and grasslands. In South America it has been collected at elevations of 2600-3600 m, which is, on the average, higher than those of Juncus tenuis var. tenuis.
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Distribution
Mexico North America| Chiapas Mexico North America| Distrito Federal Mexico North America| Durango Mexico North America| Hidalgo Mexico North America| Jalisco Mexico North America| México Mexico North America| Oaxaca Mexico North America| San Luis Potosí Mexico North America| Tlaxcala Mexico North America| Veracruz Mexico North America| Zacatecas Mexico North America| Guatemala Central America| Huehuetenango Guatemala Central America| El Salvador Central America| Santa Ana El Salvador Central America| Colombia South America| Boyacá Colombia South America| Cundinamarca Colombia South America| Santander Colombia South America| Valle Colombia South America| Venezuela South America| Mérida Venezuela South America| Ecuador South America| Pichincha Ecuador South America| Loja Ecuador South America| Sucumbíos Ecuador South America| Zamora-Chinchipe Ecuador South America| Peru South America| Ancash Peru South America| Huánuco Peru South America| Junín Peru South America| La Libertad Peru South America|