Habenaria amoena Summerh.

First published in Kew Bull. 11: 218 (1956)
This species is accepted
The native range of this species is Tanzania to N. Namibia. It is a tuberous geophyte and grows primarily in the seasonally dry tropical biome.

Descriptions

Orchidaceae, I. la Croix and P.J. Cribb. Flora Zambesiaca 11:1. 1995

Morphology General Habit
Terrestrial herb 25–55 cm high with globose tubers c. 15 mm in diameter, sometimes with additional tubers produced at the end of c. 13 cm long rhizomes.
Morphology Stem
Stem leafy thoughout, the lowermost foliage leaf c. 8 cm from base.
Morphology Leaves
Leaves 9–13, the lowermost 2–4 sheath-like, the largest leaves in the middle, 7.5–12.5 × 1–3.5 cm, oblanceolate (rarely almost linear), narrowing at the base, suberect or spreading, light green.
Morphology Reproductive morphology Inflorescences
Inflorescence 5–21 × 2.5–4.5 cm, rather laxly many-flowered; bracts 9–15 mm long, lanceolate, acuminate.
Morphology Reproductive morphology Flowers
Flowers yellow-green, spreading, sometimes described as fragrant.
Morphology Reproductive morphology Flowers Pedicel and Ovary
Ovary and pedicel arched, 12–18 mm long.
Morphology Reproductive morphology Flowers Calyx
Dorsal sepal 4–5.5 × 2.5–4 mm, ovate, erect, convex; lateral sepals 5–7 × 2–3.5 mm, obliquely curved-lanceolate, deflexed.
Morphology Reproductive morphology Flowers Corolla
Petals 2-lobed ± to base; posterior (upper) lobe 4–5.5 × c. 1 mm, ± adnate to dorsal sepal; anterior (lower) lobe 5–9.5 × c. 0.5 mm, curving upwards.
Morphology Reproductive morphology Flowers Labellum
Lip 3-lobed almost to base; mid-lobe 5.5–9 × 1 mm, linear; side lobes 7–12 mmlong, c. 0.5 mm wide, curving up like lower petal lobes; spur 17–22 mm long, slender, parallel to ovary.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anther c. 2 mm high; canals very short, c. 0.5 mm long.
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigmas 1.5–2.5 mm long, clavate, ± appressed to base of lip.
[FZ]

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

Morphology General Habit
A terrestrial herb 3–8 dm. high, glabrous except for the roots.
Vegetative Multiplication Tubers
Tubers ovoid or nearly spherical, 1–2 cm. long, 0.8–2 cm. in diameter, densely tomentose.
Morphology Stem
Stem erect, rather slender, leafy along nearly its whole length.
Morphology Leaves
Leaves 9–13, suberect or ± spreading, the lowermost 2–4 sheath-like, the middle ones lanceolate or oblanceolate, acuminate, the largest 7.5–13.5 cm. long and 1.5–3.5 cm. broad, the uppermost 2 or 3 smaller, lanceolate.
Morphology Reproductive morphology Inflorescences
Inflorescence 10–25 cm. long, 3–4.5 cm. in diameter, rather laxly many-flowered.
Morphology Reproductive morphology Inflorescences Bracts
Bracts lanceolate, acuminate, 1–2 cm. long, shorter than the flowers.
Morphology Reproductive morphology Flowers
Flowers spreading, often nearly horizontally, green or yellowish-green, fragrant; pedicel with ovary curved, 15–20 mm. long.
Morphology Reproductive morphology Flowers Calyx
Dorsal sepal erect, elliptical-ovate, rounded at apex, convex, 4.5–6 mm. long, 3–4 mm. broad; laterals deflexed, obliquely curved-lanceolate, subacute, 6–8 mm. long, 2.7–3.5 mm. broad.
Morphology Reproductive morphology Flowers Corolla
Petals bipartite nearly to the base; posterior (upper) lobe erect, ± adherent to the dorsal sepal, linear, curved, 4.5–5.5 mm. long, i 1 mm. broad; anterior lobe much narrower, curved upwards, 7.5–9.5 mm. long.
Morphology Reproductive morphology Flowers Labellum
Lip decurved, tripartite from an undivided base 1.5- 2 mm. long; middle lobe broadly linear, 5.5–8 mm. long and 1 mm. broad; side lobes linear, 7–10 mm. long, half as broad as the middle lobe.
Morphology Reproductive morphology Flowers Spur
Spur ± parallel to ovary, only slightly swollen in the apical half, 17–22 mm. long.
Morphology Reproductive morphology Flowers Androecium Stamens Anthers
Anther ± 2 mm. high, rounded at apex, loculi parallel, ± reclinate, canals porrect, very short, ± 0.5 mm. long.
Morphology Reproductive morphology Flowers Gynoecium Stigma
Stigmas ± adpressed to base of lip, thinly club-shaped, 1.5–2.5 mm. long.
Morphology Reproductive morphology Flowers Rostellum
Rostellum triangular, short and broad.
Habitat
Open woodland and scrub; 1800 m.
Distribution
T7
[FTEA]

Sources

  • Flora Zambesiaca

    • Flora Zambesiaca
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • 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/
  • 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