Pleurothallis deregularis (Barb. Rodr.) Luer 1978 SUBGENUS Psuedostelis [Schltr.] Luer 1998

Another AnglePhotos by Luis Filipe Varella and his Flickr Orchid Photo Website

Type Drawing Drawing by Martius, Eichler and Urban: "Flora Brasiliensis" vol. 3 pt. 4 tab. 78.


Common Name The Irregular Pleurothallis

Flower Size

Found from Belize, Honduras, Costa Rica, Panama and then Ecuador, Peru and Brazil as a small to medium sized, densly caespitose, hot to warm growing epiphytic herb that occurs in lowland forests at elevations of 100 to 1900 meters with clustered ramicauls enveloped basally by 2 to 4 tubular sheaths and carrying a single, apical, coriaceous to subcoriaceous, erect to patent, variable, lanceolate, oblong, elliptic, oblanceolate-ligulate, to ovate, obtuse to rounded apically, from almost sessile to cuneate to longly attenuate and petiolate base leaf that blooms on 1 to several apical, distichous to subsecund, densly and simultaneously many tiny flowered racemes that are much longer than the leaf, that occurs in the summer and fall. This species superficially resembles a Stelis

Synonyms Physosiphon deregularis (Barb. Rodr.) Cogn. 1896; Physosiphon minutiflorus Ames & C. Schweinf. 1925; Physosiphon spiralis Lindl. 1830; Pleurothallis clausa A. Rich. ex Rchb. f. 1857; Pseudostelis bradei Schltr. 1922; Pseudostelis deregularis (Barb. Rodr.) Schltr. 1922; Pseudostelis schweinforthiana L.O. Williams ; Pseudostelis spiralis (Lindl.) Schltr. 1922; *Stelis deregularis Barb. Rodr. 1882;

References W3 Tropicos, Kew Monocot list , IPNI ; Symbolae Antillanae Vol VI Orchidaceae Urban 1909 as P crassipes; Symbolae Antillanae Vol VI Orchidaceae Urban 1909 as P velaticaulis; Die Orchideen Schlechter 1915 as Physosiphon deregularis; The Orchids of Panama L.O. Williams & P Allen 1946 as Physosiphon minutiflorus drawing good; Venezuelan Orchids Vol 2 Dunsterville & Garay 1961 as P velaticaulis; Encyclopedia of Cultivated Orchids Hawkes 1965 as Pseudostelis bradei; Encyclopedia of Cultivated Orchids Hawkes 1965 as Pseudostelis derregularis; Flora de Venezuela Foldats Volumen XV Part 2 1969 as Pleurothallis velaticaulis; Icones Planetarum Tropicarum plate 139 Dodson 1980 as Physosiphon spiralis drawing ok; Icones Planetarum Tropicarum plate 224 Dodson 1980 drawing fide; Systematics of Pleurothallis Vol 3 Luer 1986; Systematics of Pleurothallis Vol 3 Luer 1986 as P pichinchae; Systematics of Pleurothallis Vol 3 Luer 1986 as P velaticaulis; Icones Pleurothallidinarum Vol XVIII Systematics of Pleurothallis subsection Antenniferae, Longiracemosae, Macrophyllae-racemosae and Subgenera Pseudsostelis and Acuminata Luer 1999 drawing fide; Lindleyana Vol 16 No 4 2001 as Stelis velaticaulis; Orchidees du Bresil As Orquideas da Serra do Castelo [Espirito Santo Brazil] Chiron & Bolsanello Vol 2 2013 as S deregularis drawing fide/photo good