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This species is accepted, and its native range is SE. Brazil (to Paraná).

[KBu]

De Brito, A. (2007). A Taxonomic Revision of the Genus Phymatidium (Orchidaceae: Oncidiinae). Kew Bulletin, 62(4), 529-560. Retrieved from http://www.jstor.org/stable/20443388

Distribution
Brazil: São Paulo, Rio de Janeiro, Minas Gerais and Espírito Santo.
Ecology
Epiphytic on small branches of shrubs and trees in forest. Also found in disturbed areas and orchards. Alt. 0 - 1400 m.
Morphology General Habit
Plant up to c. 35 mm tall, usually forming a intricate clump
Morphology Leaves
Leaves up to c. 30 x 1.5 mm, falcate, somewhat twisted, variable in cross-section in the same specimen and the same leaf, 3-angled, semi-terete, oval to semi-oval, slightly sheathing and shortly decurrent at base, the apex acute
Morphology Reproductive morphology Flowers
Flowers usually resupinate, white with green centre
Morphology Reproductive morphology Flowers Calyx
Lateral sepals 3 - 4 x 0.5 - 1.5 mm, narrowly ovate to somewhat oblong, slightly falcate, strongly reflexed, acute to obtuse, abaxially slightly carinate Dorsal sepal 2.5 - 3.5 x 0.5 - 1.5 mm, oblong-lanceolate, ovate or narrowly ovate, usually somewhat lanceolate and falcate, reflexed, somewhat arching, slightly concave, acute to slightly obtuse, abaxially weakly carinate
Morphology Reproductive morphology Flowers Column
Column 2 3.5 mm long (excluding the tabula infrastigmatica), clearly sigmoid, sulcate underneath; apex of the column somewhat recurved, usually somewhat apiculate, auriculate, the auricles glabrous, somewhat obliquely broadly ovate to slightly semi-lunate when spread, running from approximately the same level as the rostellum and diminishing in breadth towards the apex of the column, the margins of the auricles usually somewhat erose to crenulate; stigmatic cavity small, ovate, placed at the base of the column; rostellum very short, curved forwards; tabula infrastigmatica 0.7 - 1 x 0.6 mm, laterally excavated in side view, with a small, raised, thick, somewhat cordiform-sagittate to broadly lanceolate callus sitting on a shorter, thick, usually semi-globose to ovoid platform; anther 1.5 mm long, narrowly ovate, operculate, distinctly beaked, incurved, with a small tooth on each margin near apex, which is shortly recurved and emarginate; pollinia arranged in two superposed unequal pairs, the superior pair clavate, the inferior somewhat obovoid; stipe c. 1.2 mm long, narrowly spathulate, curved forward at the base, the apex weakly emarginate; viscidium small, somewhat rounded and concave
Morphology Reproductive morphology Flowers Corolla
Lip 3 - 4 x 2 - 4 mm, broadly unguiculate; blade cordiform, acute, deflexed, usually rather convex; margins dentate to erose at middle of the lip, becoming entire towards the base and the apex; base provided with a large, thick, concave, broadly ligulate callus which is glandular within and equals or slightly exceeds the length of the claw of the lip Petal 3 - 4 x 0.6 - 1.2 mm, ovate to narrowly ovate, oblong or lanceolate, usually somewhat oblique with slightly waved margins, convex, slightly reflexed and arching upwards, acute to obtuse, abaxially slightly carinate
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary 0.5 - 1 mm long, slightly three-keeled
Morphology Reproductive morphology Flowers Pedicel
Pedicel 3 - 5.5 mm long, somewhat twisted, slightly angular, inconspicuously papillose on the angles
Morphology Reproductive morphology Fruits
Capsule c. 3 x 2.5 mm, subglobose, obscurely ridged, the pedicel 2.5 - 4.5 min long.
Morphology Reproductive morphology Inflorescences
Inflorescences several, up to c. 100 mm long, racemose, few- to c. 20 flowered; peduncle up to c. 45 mm long, 3-angled in cross-section, flexuous, covered by several, fleshy,  usually somewhat 3-angled in cross-section, falcate, narrowly ovate-lanceolate to linear-subulate sterile bracts, up to c. 10 x 0.5 mm, acute; rachis up to c. 55 mm long, usually slightly zig-zag, 3-angled in cross section; floral bracts similar to the sterile ones, decreasing in size towards the apex of inflorescence
Morphology Roots
Roots several, terete, thick, papillose, somewhat flexuous, usually quite long and forming a cluster of several adnate roots
Morphology Stem
Stem up to c. 15 mm long, usually inconspicuous and branched near the base
Note
Although similar in habit to Phymatidium aquinoi, P. hysteranthum is closely related to P. delicatulum and its allies. The strongly reflexed sepals and arching petals together with column and anther morphology are very distinctive and readily separate it from all other species of Phymatidium. This species was misidentified as P. delicatulum in Senghas (1995). The specific epithet derives from the Latin hysteranthus, meaning leaves produced later than the flowers. However, this phenomenon has not been reported in the genus Phymatidium.
Type
Brazil, Rio de Janeiro, Barbosa Rodrigues s.n. (Lost). Lectotype, here designated: Barbosa Rodrigues' original illustration which appeared in his Iconographie des orchidées du Brésil, vol. 6, plate 315, fig. A (Library of Rio de Janeiro Botanical Garden!), reproduced in Sprunger et al. (1996: 443).

Native to:

Brazil South, Brazil Southeast

Phymatidium hysteranthum Barb.Rodr. appears in other Kew resources:

Date Reference Identified As Barcode Type Status
Warren [93/8], Brazil 74487.000
Toscano de Brito, A. [670], Rio de Janeiro 76114.000
Toscano de Brito, A. [670] 76117.000
Toscano de Brito, A. [678], Brazil 74475.000

First published in Gen. Spec. Orchid. 2: 228 (1882)

Accepted by

  • Govaerts, R. (2003). World Checklist of Monocotyledons Database in ACCESS: 1-71827. The Board of Trustees of the Royal Botanic Gardens, Kew.
  • Royer, C.A., Toscano de Brito, A.L.V. & de Camargo Smidt, E. (2014). O gênero Phymatidium (Orchidaceae: Oncidiinae) no estado do Paraná Rodriguésia; Revista do Instituto de Biologia Vegetal, Jardim Botânico e Estaçao Biologica do Itatiaya 65: 251-260.
  • Toscano de Brito, A.L.V. (2007). A taxonomic revision of the genus Phymatidium (Orchidaceae: Oncidiinae) Kew Bulletin 62: 529-560.

Literature

Kew Bulletin

  • Barbosa Rodrigues, J. (1882). Genera et Species Orchidearum Novarum,Vol. 2. Sebastianopolis, Rio de Janeiro.
  • Bock, I. (1998a). Phymatidium hysteranthum. Orchidee (Hamburg) 49, orchideenkartei: 873 - 874.
  • Cogniaux, A. (1904 - 1906). Orchidaceae. In: C. F. P. Martius, A. G. Eichler & I. Urban, Flora Brasiliensis, Vol. 3, Part 6. Munich & Leipzig.
  • Cogniaux, A. (1907). Notes sur les orchidées du Brésil et des régions voisines. Bull. Soc. Roy. Bot. Belgique 43: 266 - 356.
  • Miller, D. & Warren, R. (1996). Orquídeas do Alto da Serra da Mata Atlántica Pluvial do Sudeste do Brasil. Salamandra Consultoria Editorial Ltda. Rio de Janeiro.
  • Pabst, G. F. J. & Dungs, F. (1977). Orchidaceae Brasilienses, Vol. 2. Brucke-Verlag Kurt Schmersow, Hildesheim.
  • Pabst, G. F. J. (1954). Contribuição para o conheeimento das orquídeas de Santa Catarina e sua dispersão geográfica — II. Sellowia 6 (6): 181 - 197.
  • Senghas, K. (1995). Tribus Oncidieae. subtribus Telipogoninae and subtribus Ornithocephalinae. In: F. G. Brieger, R. Maatsch & K. Senghas (eds.), Schlechtere Die Orchideen 3: 1863 - 1913.

Kew Backbone Distributions

  • Royer, C.A., Toscano de Brito, A.L.V. & de Camargo Smidt, E. (2014). O gênero Phymatidium (Orchidaceae: Oncidiinae) no estado do Paraná Rodriguésia; Revista do Instituto de Biologia Vegetal, Jardim Botânico e Estaçao Biologica do Itatiaya 65: 251-260.
  • Toscano de Brito, A.L.V. (2007). A taxonomic revision of the genus Phymatidium (Orchidaceae: Oncidiinae) Kew Bulletin 62: 529-560.

Herbarium Catalogue Specimens

Kew Backbone Distributions
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0

Kew Bulletin
Kew Bulletin
http://creativecommons.org/licenses/by-nc-sa/3.0

Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0