Porpax angustifolia (Mansf.) Schuit., Y.P.Ng & H.A.Pedersen

First published in Bot. J. Linn. Soc. 186: 199 (2018)
This species is accepted
The native range of this species is Tanzania (NW. Uluguru Mountains). It is a pseudobulbous epiphyte and grows primarily in the seasonally dry tropical biome.

Descriptions

IUCN Red List of Threatened Species https://www.iucnredlist.org/species/179853/1592172

Conservation
EN - endangered
[IUCN]

Orchidaceae, V. S. Summerhayes. Flora of Tropical East Africa. 1968

Morphology General Habit
A dwarf, creeping epiphytic herb to 6.5 cm. high.
Vegetative Multiplication Pseudobulbs
Pseudobulbs closely spaced, forming mats, closely appressed to the substrate, ovoid, dorsiventrally compressed, to 0.8 cm. long, 0.7 cm. wide, 2-leaved at apex, buff-coloured.
Morphology Leaves
Leaves oblong-ligulate, to 4 cm. long, 0.4 cm. wide, shortly apiculate, articulated to a short leaf-base 0.4–1 cm. long.
Morphology Reproductive morphology Inflorescences
Inflorescence 2–4-flowered, 2.5–6 cm. long; peduncle slender, terete; bracts triangular-lanceolate, 0.4 cm. long.
Morphology Reproductive morphology Flowers
Flowers dull yellow, with deep dull purple suffusion on mentum and a dark purple lip.
Morphology Reproductive morphology Flowers Calyx
Dorsal sepal lanceolate, fleshy, 1 cm. long, 0.35 cm. wide, acuminate; lateral sepals joined for basal quarter, 1 cm. long, 0.45 cm. wide, acuminate, forming a sac-like mentum at base with column-foot.
Morphology Reproductive morphology Flowers Corolla
Petals linear-lanceolate, 0.8 cm. long, 0.1 cm. wide, acute.
Morphology Reproductive morphology Flowers Labellum
Lip ± ovate when spread, V-shaped, canaliculate in cross-section, 0.4 cm. long, 0.25 cm. wide, subacute, margins in front somewhat undulate-erose; disc with 2 diverging verruculose ridges in basal third.
Morphology Reproductive morphology Flowers Column
Column very short, truncate, fleshy, 0.05 cm. long; anther-cap bluntly conical, verrucose; rostellum flap-like, broad; stigma oval; column-foot curved, 0.3 cm. long.
Habitat
Epiphytic among mosses and lichens on small branches of trees in mist forest; 1850–2000 m.
Distribution
T6 known only from NW. Uluguru Mts.
[FTEA]

Sources

  • Flora of Tropical East Africa

    • Flora of Tropical East Africa
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Herbarium Catalogue Specimens

    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/
  • IUCN Categories

    • IUCN Red List of Threatened Species
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0