Juncus dudleyi

Juncus dudleyi Wiegand, Bull. Torrey Bot. Club 27: 524. 1900. Type: USA. New York: Truxton, K. M. Wiegand s. n. (holotype CU). Fig. 9 Juncus andreanus Weath., Contr. Gray Herb. 81: 84. 1928. Type: Colombia. Cundinamarca: Facatativa, 2680 m, 16 Jun 1875, E. F. André 624 (holotype GH; isotypes F, K, NY, P, S, US). Juncus platycaulos Kunth, Nov. Gen Sp. (Quarto) 1: 236, 1: 190 (folio). 1816; Juncus tenuis Willd. var. platycaulos (Kunth) Buchenau, Bot. Jahrb. Syst. 12: 194. 1890. Type: Colombia. Tolima-Quindío: Mt. Quindío between Ibague and La Palmilla, A. von Humboldt & A. J. Bonpland s.n. (lectotype P; isolectotype MO, fide H. Balslev Fl. Netrop. Monog. 68: 65. 1996). Perennial cespitose herbs, to 70 cm tall. Rhizome densely branching. Culms usually smooth, sometimes slightly longitudinally ridged; auricles ca. 0.5 mm long, wider than long, rounded, cartilaginous. Leaf blade terete or channeled, when channeled the central part of the cross section 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, flexuose, 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. Las Coloradas above La Baja, 3900 m, 27 Jan 1927, Killip 18483, fr (GH, NY, US). Valle del Cauca: Barragán, río Bugalagrande, Loma de Barragán, La Parilla-La Machuca, 2660- 2750 m, 13 Apr 1946, Cuatrecasas 20644, fr (F, US). Habitat and distribution. J. dudleyi is widely distributed in North America and Mexico, scattered in the Central American highlands. In South America is distributed in the Andes from Venezuela to Ecuador, and disjunctly in central Peru. It grows in wet places, along streams, lakes, and roads, and in meadows and grass lands at elevations of 2600-3900 m above sea level, which is, on the average, higher than Juncus tenuis. In Colombia J. dudleyi has been found in center of the Cordillera Oriental (Boyacá, Cundinamarca and Santander) and Cordillera Central (Valle del Cauca), at elevations of 2600-3650 m. Comments. This species is probably introduced in tropical and temperate South America and was often recognized as J. tenuis var. platycaulos. However, the identity of the South American plants requires further study. Representative specimens. Boyacá: near Soata, 2800 m, 4 Mar 1939, Alston 7394 p.p., fr (F, NY, US); Tunja, 2820 m, 5 Jul 1973, Ballesteros-G. 3, fr (COL); Sierra Nevada del Cocuy, río San Paulino-finca Ritacuba, 3650 m, 4-5 Apr 1959, H. G. Barclay 7320, lf (COL, MO, US). Cundinamarca: Bogotá, 2640 m, André 1369 (K); without data, Brother Idinoel 6 (NY); Bogotá, Universidad Nacional, 2600 m, 28-29 Apr 1986, Fernández-Alonso 6412, fr (COL); Zipaquira, 2600 m, 20-24 Oct 1917, Pennell 2558, fr (GH, MO, NY, US); laguna La Herrera, 2600 m, 19 Jun 1985, Vink 372, fl (COL). Santander: E slope of páramo de

Juncus

Ballesteros 3
Vink 372

Juncaceae