Poaceae

Hydrothauma C.E.Hubb.

First published in Hooker's Icon. Pl. 35: t. 3458 (1947)
This genus is accepted
The native range of this genus is S. DR Congo to Zambia.

Descriptions

Gramineae, W. D. Clayton. Flora Zambesiaca 10:3. 1989

Morphology Reproductive morphology Inflorescences
Inflorescence a slender spiciform panicle, sometimes reduced to a unilateral raceme with paired spikelets.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets dorsally compressed.
Morphology Reproductive morphology Inflorescences Bracts Glume
Inferior glume 1/2 length of spikelet, hyaline, truncate, the superior equalling spikelet and gibbous.
Morphology Reproductive morphology Inflorescences Bracts Lemma
Superior lemma cartilaginous with flat margins.
[FZ]

nonem

Morphology General Habit
Annual. Culms decumbent, or prostrate; 10-20 cm long; spongy; rooting from lower nodes. Leaf-sheath auricles erect. Ligule an eciliate membrane. Leaf-blade base with a false petiole. Leaf-blades flaccid. Leaf-blade surface with ribs raised into sinuous lamellae.
Morphology Reproductive morphology Inflorescences
Inflorescence a panicle. Panicle spiciform. Spikelets solitary. Fertile spikelets pedicelled. Pedicels linear; tip discoid.
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; gibbous; 1.8-2.5 mm long; falling entire.
Fertile
Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; dorsally compressed; gibbous; 1.8-2.5 mm long; falling entire.
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes reaching apex of florets; thinner than fertile lemma. Lower glume oblate; hyaline; without keels; 0 -veined. Lower glume lateral veins absent. Lower glume apex truncate. Upper glume elliptic; gibbous; membranous; without keels; 7-9 -veined. Upper glume apex entire, or with a unilateral tooth.
Morphology Reproductive morphology Flowers Florets
Basal sterile florets male, or barren; with palea. Lemma of lower sterile floret oblong; membranous; 7 -veined; emarginate. Fertile lemma elliptic; cartilaginous; without keel. Lemma lateral veins obscure. Lemma apex acute. Palea cartilaginous.
Morphology Reproductive morphology Flowers
Anthers 3.
Distribution
Africa.
[GB]

Sources

  • Flora Zambesiaca

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

  • 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

  • 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