Lentibulariaceae
Utricularia

Utricularia arenaria A.DC.

First published in A.P.de Candolle, Prodr. 8: 20 (1844)
This species is accepted
The native range of this species is Tropical & S. Africa, Madagascar, Central India. It is an annual and grows primarily in the seasonally dry tropical biome.

Descriptions

Lentibulariaceae, P. Taylor. Flora of Tropical East Africa. 1973

Morphology General Habit
Terrestrial herb.
Morphology General Rhizoids
Rhizoids and stolons capillary, numerous from the base of the scape.
Morphology Leaves
Leaves usually numerous at anthesis, scattered on the stolons, linear-oblanceolate to obovate-spathulate, 2–15 mm. long, 0.3–2 mm. wide, 1-nerved.
Morphology General Traps
Traps numerous, ovoid, stalked, 0.6–1.0 mm. long; mouth terminal; upper lip projecting ± twice as much as the lower, both provided with radiating rows of glandular hairs.
Morphology Reproductive morphology Inflorescences
Inflorescence erect, 2–16 cm. high; flowers 1–5(–8), distant; scape filiform, smooth above, usually papillose at the base; scales few, similar to the bracts; bracts basifixed, ovate-lanceolate, acute, ± 1 mm. long; bracteoles similar but narrower; pedicels 0.5–1 mm. long.
Morphology Reproductive morphology Flowers Calyx
Calyx-lobes subequal, the upper slightly larger, broadly ovate, acute, lower ovate-oblong, rounded or truncate.
Morphology Reproductive morphology Flowers Corolla
Corolla white or lilac with a yellow spot on the palate, 3–7 mm. long; upper lip narrowly oblong, ±1.5 times as long as the upper calyx-lobe, apex rounded, truncate or emarginate; lower lip orbicular; palate raised, double-crested, the crests smooth or transversely tuberculate; spur conical-subulate, ± twice as long as the lower lip.
Morphology Reproductive morphology Flowers Androecium Stamens
Filaments filiform; anther-thecae subdistinct.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary ovoid; style very short; stigma lower lip semi-orbicular, upper much smaller, deltoid.
Morphology Reproductive morphology Fruits
Capsule globose, 1.5–2.5 mm. in diameter, dehiscing by longitudinal ab- and adaxial slits with thickened margins.
Morphology Reproductive morphology Seeds
Seeds numerous, ± 0.2 mm. long, truncate-conical, angular; testa smooth, cells indistinct, oblong.
Habitat
Boggy grassland, damp open sandy ground and rock pavements; sea-level to 2650 m.
Distribution
K3 K4 K5 K7 P T1 T2 T3 T6 T7 T8 U1 U3 U4 Senegal to Ethiopia and south to South West Africa and South Africa (Natal), Madagascar and India
[FTEA]

Lentibulariaceae, P. Taylor. Flora Zambesiaca 8:3. 1988

Morphology General Habit
Terrestrial herb.
Morphology General Rhizoids and Stolons
Rhizoids and stolons capillary, numerous from the base of the peduncle.
Morphology Leaves
Leaves usually numerous at anthesis, scattered on the stolons, linear-oblanceolate to obovate-spathulate, 2–15 mm. long, 0.3–2 mm. wide, 1-nerved.
Morphology General Traps
Traps numerous, ovoid, stalked, 0.6–1.0 mm. long; mouth terminal provided with dorsal and ventral radiating rows of glandular hairs.
Morphology Reproductive morphology Inflorescences
Inflorescence erect, 2–16 cm. high; flowers 1–5(8), distant; scape filiform, smooth above, usually papillose at the base; scales few, similar to the bracts; bracts basifixed, ovate-lanceolate, acute, more or less 1 mm. long; bracteoles similar but narrower; pedicels 0.5–1 mm. long.
Morphology Reproductive morphology Flowers Calyx
Calyx lobes subequal, the upper slightly larger, broadly ovate, acute, lower ovate-oblong, rounded or truncate.
Morphology Reproductive morphology Flowers Corolla
Corolla white or lilac with a yellow spot on the palate, 3–7 mm. long; superior lip narrowly oblong, more or less 1.5 times as long as the upper calyx lobe, with apex rounded, truncate or emarginate; inferior lip circular; palate raised, double-crested, the crest smooth or transversely tuberculate; spur conical-subulate, more or less twice as long as the inferior lip.
Morphology Reproductive morphology Flowers Androecium Stamens
Filaments filiform; anther-thecae subdistinct.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary ovoid; style very short; inferior lip of stigma semi-circular, the superior deltoid, much smaller.
Morphology Reproductive morphology Fruits
Capsule globose, 1.5–2.5 mm. in diam., dehisceing by longitidinal dorsal and ventral slits with thickened margins.
Morphology Reproductive morphology Seeds
Seeds numerous, more or less 0.2 mm. long, truncate-conical, angular; testa smooth, cells indistinct, oblong.
[FZ]

Lentibulariaceae, P. Taylor. Flora of West Tropical Africa 2. 1963

Morphology General Habit
Erect, delicate herb 2-6 ins. tall
Morphology Reproductive morphology Flowers
Bearing 2-4 white or mauve flowers
Morphology Leaves
Leaves oblanceolate-spathulate.
[FWTA]

Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E. https://nph.onlinelibrary.wiley.com/doi/full/10.1111/nph.19592

Conservation
Predicted extinction risk: not threatened. Confidence: confident
[AERP]

Sources

  • Angiosperm Extinction Risk Predictions v1

    • Angiosperm Threat Predictions
    • http://creativecommons.org/licenses/by/4.0

  • 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

  • Flora of West Tropical Africa

    • Flora of West Tropical Africa
    • http://creativecommons.org/licenses/by-nc-sa/3.0

  • Herbarium Catalogue Specimens

    • 'The Herbarium Catalogue, Royal Botanic Gardens, Kew. Published on the Internet http://www.kew.org/herbcat [accessed on Day Month Year]'. Please enter the date on which you consulted the system.
    • 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