Nymphoides macrosperma Vasudevan
- Vasudevan, R. 1968. A new species of Nymphoides (Menyanthaceae) from south India. Kew Bulletin 22: 101.
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| India: Kerala.
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Nymphoides macrosperma Vasudevan
- Vasudevan, R. 1968. A new species of Nymphoides (Menyanthaceae) from south India. Kew Bulletin 22: 101.
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A ceteris speciebus indicis floribus dioecis, seminibus (tantum 2-6) duplo majoribus magis asymmetricis magis muriculatia, hilo majore obliquo differt.
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Differs from other Indian species in dioecious flowers, seeds (only 2-6) twice as large, more asymmetrical, more muricate, with a larger, oblique hilum.
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Planta dioica aquatica, rhizomate perennante, ramis natantibus. Folia simplicia, orbicularia, cordata, natantia. Flores in ramis natantibus aggregati albi, unisexuales, bracteati, pedicellati, actinomorphi, hypogyni. Flores masculi: Calyx gamosepalus, in lacinias 5 spiraliter curvatas raro imbricatas 1.5 x 3 mm. alte divisus; corolla gamopetala, rotata, alba, in lacinias 5 oblongas acutas induplicatao-valvatas 2 x 6 mm. alte divisa, marginibus fimbriatis, superficie superiore vix pilosa; stamina 5, epipetala; filamentis albis, filiformibus, 2 mm. longis; antheris 1 mm. longis, 4-lobatis bilocularibus introrsis; polline luteolo, subsphaerico laevi parietibus tenuibus; pistillodio eminente simili pistillo fertili sed angustiore, ovulis abortivis, pilis stigmaticis brevibus. Flores feminei: calyx et corolla ut in flore masculo; staminodiis 5 forma et positione stamini similibus sed minutissimis albis; gynoecium ca. 4 mm., superius, bicarpellare, uniloculare, glandulis 5 basi aurantiacis ornatum; stylo brevi; stigmate bifido; lobis distincte fimbriatis; ovulis in utraque placenta 1-3 lenticularibus anatropis. Fructus ca. 6 x 8 mm., subglobosus, fusco-brunneus, muriculatus, endospermio carnoso, embryone recto paulum compresso.
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Dioecious aquatic plant, with perennating rhizome, floating branches. Leaves simple, orbicular, cordate, floating. Flowers aggregated on floating branches, white, unisexual, bracteate, pedicellate, actinomorphic, hypogynous. Masculine flowers: Calyx gamosepalous, divided into five spirally-curved, rarely imbricate lobes, 1.5 x 3 mm deep. Corolla gamopetalous, rotate, white, divided into five oblong, acute, induplicate-valvate lobes, 2 x 6 mm deep, with fimbriate margins, upper surface scarcely pilose. Stamens five, epipetalous; filaments white, filiform, 2 mm long; anthers 1 mm long, four-lobed, bilocular, introrse; pollen yellow, sub-spherical, smooth, with thin walls. Pistillode emanating like a fertile pistil but more narrow, with abortive ovules, short stigmatic hairs. Feminine flowers: Calyx and corolla as in masculine flowers. Staminodes five, in form and position similar to stamens, but very small, white. Gynoecium around 4 mm, superior, two-carpellate, unilocular, adorned with five orange glandules at the base; style short; stigma bifid; lobes distinctly fimbriate; ovules in each placenta 1-3, lenticular, anatropous. Fruit around 6 x 8 mm, sub-globose, dark-brown, finely muricate, with fleshy endosperm, with a straight, somewhat compressed embryo.
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