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Nymphoides spongiosa Aston
- Aston, H.I. 1982. New Australian species of Nymphoides Séguier (Menyanthaceae). Muelleria 5:35-51.
| status
| collector
| date
| locality
| deposited
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|---|
| holotype
| Aston 1936
| 17 May 1976
| About 6 km east of the Howard River crossing of the Howard Springs to "Koolpinyah" road, 12°26'S, 131°08'E, Northern Territory.
| MEL
| | isotype
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| CANB
MEL
NT
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Nymphoides spongiosa Aston
- Aston, H.I. 1982. New Australian species of Nymphoides Séguier (Menyanthaceae). Muelleria 5:35-51.
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Plantae annuae. Laminae foliorum ellipticae-oblongae ad late ovatae, integrae, profunde cordatae, (1-)2-5.5 x (0.8-)1.5-4.5 cm, infra spongiosae sed laeves (haud rugosae). Inflorescentia fasciculus pedicellorum densus, ad basin sinus folii ortus. Flores heterostyli, (4)5(6)-partiti. Corolla (7-)10-18(-20) mm diametro, alba, fauce flavo; lobae late ellipticae, alis lateralibus undulatis integris, fimbriaque transversa prosime super basin lobae papillarum tenuium formata, praeditae. Ovarium ± globosum, in stylam abrupte contractum. Capsula latissime ellipsoidea ad ± globosa, 2.25-4 x 1.75-3 mm. Semina (5-)8-14(-25) per capsulam, ± globosa, parce compressa, tuberculis convexis brevissimis dense velata (vel tubercula nonnisi in marginibus seminum) 0.65-1.1 x 0.6-0.97 x 0.35-0.7 mm (longitudo latitudinem aequans, crassitie sesquilongior ad duplolongior), straminea ad pallide cinereo-fusca maturitate; caruncula basalis, circularis, typice crassa conspicuaque.
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Annual plant. Laminae of leaves elliptic-oblong to broadly ovate, entire, deeply cordate, (1-)2-5.5 x (0.8-)1.5-4.5 cm, spongy but smooth (hardly rugose) underneath. Inflorescence a dense fascicle of pedicels, arising at the base of the leaf sinus. Flowers heterostylous, (4)5(6)-parted. Corolla (7-)10-18(-20) mm in diameter, white, throat yellow. Lobes broadly elliptic, with entire, undulating lateral wings, and with a transverse fringe, formed of thin papillae, just above the base of the lobe. Ovary ± globose, abruptly contracted into the style. Capsule very broadly ellipsoid to ± globose, 2.25-4 x 1.75-3 mm. Seeds (5-)8-14(-25) per capsule, ± globose, sparingly compressed, densely covered with very short, convex tubercles (or tubercles only on the margins of seeds), 0.65-1.1 x 0.6-0.97 x 0.35-0.7 mm (length equaling the width, one and a half or two times longer than the thickness), straw-colored to pale dark-ashen. Caruncle basal, circular, typically thick and conspicuous.
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