Poaceae
Jansenella

Jansenella neglecta S.R.Yadav, Chivalkar & Gosavi

First published in Rheedea 20: 39 (2010)
This species is accepted
The native range of this species is India (Maharashtra). It is an annual and grows primarily in the seasonally dry tropical biome.

Descriptions

Morphology General Habit
Annual; caespitose. Culms erect, or geniculately ascending; slender; 10-40 cm long; rooting from lower nodes. Culm-nodes glabrous. Leaf-sheaths 1-2.5 cm long; outer margin hairy. Ligule an eciliate membrane. Leaf-blade base amplexicaul. Leaf-blades lanceolate; 1.5-5 cm long; 3.5-10 mm wide. Leaf-blade margins ciliate; hairy at base. Leaf-blade apex acute.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle open; ovate; dense; 2-3 cm long. Spikelets in pairs. Fertile spikelets pedicelled; 2 in the cluster. Pedicels unequal.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate; laterally compressed; 7-12 mm long; 3-4.2 mm wide; breaking up at maturity; disarticulating below each fertile floret.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets oblong, or ovate; laterally compressed; 7-12 mm long; 3-4.2 mm wide; breaking up at maturity; disarticulating below each fertile floret.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes persistent; similar; with lower wider than upper; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 5-6.5 mm long; 0.6 length of upper glume; membranous; without keels; 3 -veined. Lower glume surface pilose; with tubercle-based hairs. Lower glume apex acute; awned; 1 -awned. Lower glume awn 1.6-2 mm long. Upper glume lanceolate; 8-10 mm long; 1 length of adjacent fertile lemma; membranous; without keels; 3-5 -veined. Upper glume surface pilose; with tubercle-based hairs. Upper glume apex acute; awned; 1 -awned. Upper glume awn 3-3.5 mm long.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets male, or barren; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; lanceolate; 6.5-7.5 mm long; 0.9 length of fertile lemma; membranous; 3 -veined; awned. Awn of lower sterile floret 1.4-2.6 mm long. Palea of lower sterile floret 4-5 mm long; winged on keels (narrowly); pilose; adorned on flanks. Fertile lemma oblong; 7.5-9 mm long; 1.8-2 mm wide; coriaceous; without keel; 3 -veined. Lemma surface pilose; hairy at base; with marginal hair tufts; bearing 2 hair tufts in all. Lemma margins involute; interlocking with palea keels. Lemma hairs white, or tawny. Lemma apex lobed; 2 -fid; awned; 3 -awned. Principal lemma awn from a sinus; geniculate; flat below; 15-18 mm long overall; with twisted column. Lateral lemma awns arising on apex of lobes; 3-4 mm long; shorter than principal. Palea 4.2-4.5 mm long; 2 -veined. Palea keels winged; narrowly winged. Palea surface scabrous. Palea apex dentate; 2 -fid.
Morphology Reproductive morphology Flowers
Anthers 3; 1 mm long. Stigmas 2. Styles 1.2-1.4 mm long.
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp; ellipsoid; dorsally compressed; plano-convex; 2-2.5 mm long. Embryo 0.5 length of caryopsis. Hilum punctiform.
Distribution
Asia-tropical: India.
Reference
Arundinelleae. Yadav et al 2011.
[GB]

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: threatened. Confidence: confident
[AERP]

Sources

  • Angiosperm Extinction Risk Predictions v1

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

  • GrassBase - The Online World Grass Flora

    • Clayton, W.D., Vorontsova, M.S., Harman, K.T. and Williamson, H. (2006 onwards). GrassBase - The Online World Grass Flora.
    • 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 2025. 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 2025. 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