Pleurothallis undulata Poepp. & Endl. 1836 SUBGENUS Pleurothallis SECTION Macrophyllae-Fasciculatae Lindl 1859
Photo by © S Manning and The Swiss Orchid Foundation at the Jany Renz Herbaria Website
Original Drawing by © Padre Pedro Ortiz Conserved at the Herbario de la Universidad Javeriana, Bogota Colombia
Drawing by © Carl Luer
Common Name The Undulate Pleurothallis [refer to the margins of the dried leaf]
Flower Size .6" [1.5cm]
Found in Huanuco, Junin, Loreto, San Martin and Pasco departments of Peru in dense forests at elevations around 600 to 1900 meters as a miniature to small sized, warm to cool growing, caespitose epiphyte or terrestrial on steep embankments with slender, erect ramicauls enveloped by a close, tubular sheath below the middle and 2 others at the base and carrying a single, apical, spreading, horizontal, thickly coriaceous, cordate-ovate, acute, deeply cordate and sessile base leaf that blooms at most any time of the year on a fascile, arising through a spathe, of successive, single flowered inflorescence witha tubular, as long as the pedicel floral bract.
"The relatively small, horizontal leaves of this species are thickly coriaceous, rigid, cordate and acute. Because of the thick texture, the margins sometimes appear minutely undulate after being pressed and dried in Herbariom specimens. The flowers are relatively small and somewhat variable in proportions of length and width of the dorsal sepal and synsepal each usually between .24 to .36" [6 to 9 mm] long, The dorsal sepal is oblong to ovate, acute to subacute and always three veined. On top of the base of the leaf the flowers are borne singly and successively in a fascile, or a few may be bore simultaneously by short pedicels. The colors of the flower parts vary in combinations of yellow, orange, red, brown or purple. The slender, linear, single veined petals are more or less straight as they project laterally from the sides of the flower. They vary somewhat in length but are always less than .04" [1 mm] wide, most often about .02" [.5 mm] wide. The margins vary from entire to microscopically erose with is invisible to the naked eye. The lip is ovate, most often subacute, thin and essentially flat, usually between .12 to .16" [3 to 4 mm] long. The base is shallowly cordate and flattneed on the end to form a short, broad claw beneath the column. A well defined glenion is present on the disc above the base below the rostellum. The remaining surface of the disc is faintly sulcate. The margins are often microscopically erose." Luer 2005
Synonyms Acronia undulata (Poepp. & Endl.) Luer 2005; Humboldtia undulata [Poepp. & Endl.] Kuntze 1891; Pleurothallis junininensis Schlechter 1921; Zosterophyllanthos undulatus [Poepp. & Endl.] Szlach. & Marg. 2001
References W3 Tropicos, Kew Monocot list , IPNI ;
* Nov. Gen. Sp. Pl. 1: 48 Poepp. & Endl. 1836
Bonplandia Rchb.f 1854;
Die Orchideen der Sudamerikanischen Kordillerenstaaten IV Peru Schlechter 1921 as P juninensis;
Orchids of Peru Vol 2 Schweinfurth 1959;
Flora de Venezuela Volumen 15 Parte 2 Foldats 1970;
Venezuelan Orchids Illustrated Vol 4 Dunsterville & Garay 1972 not = P coriacardia;
Venezuelan Orchids Illustrated Vol 6 Dunsterville & Garay 1976 as P cardiantha drawing ok;
Orchids of Venezuela, An Illustrated Field Guide Vol 3 Dunsterville & Garay 1979 not = P coriacardia;
Orchids of Venezuela, An Illustrated Field Guide Vol 3 Dunsterville & Garay 1979 as P cardiantha drawing ok;
Icones Planetarum Tropicarum Plate 266 Dodson 1980 drawing ok;
Icones Pleurothallidinarum Vol III Systematics of Pleurothallis Luer 1986;
Orchids of Venezuela [An illustrated field guide] Vol. 3 Ramiro and Carnevali 2000 drawing ok;
Icones Pleurothallidinarum Vol XXVII Systematics of Dryadella Systematics of Macrophyllae-Fasciculatae Luer 2005 as Acronia undulata
Icones Pleurothallidinarum Vol XXVII Systematics of Dryadella Systematics of Macrophyllae-Fasciculatae Luer 2005 as Acronia undulata drawing ok ;
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