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Project Name Data (Last Modified On 4/2/2013)

Flora Data (Last Modified On 4/2/2013)
Species Nymphoides humboldtianum (H.B.K.) 0. Kuntze
PlaceOfPublication Rev. Gen. PI. 2: 429, 1891. (as Nymphodes).-Fig. 1.
Synonym Villarsia humboldtianum H.B.K., Nov. Gen. Sp. PI. 3: 187, 1819. Limnanthemum humboldtianum (H.B.K.) Griseb., Gen. Sp. Gent. 347, 1839.
Description Herbs aquatic, from submerged rhizomes; stems 8-150 cm long, to 6 mm in diam, ascending, green, glandular (?) dotted near the apex, succulent, weak, vertically septate with several continuous air spaces, the stems with a single terminal leaf or usually branching near the apex to give rise to an inflorescence and additional leaves. Leaves orbicular to subovate, cordate at the base, often deeply so, obtuse at the apex, often becoming emarginate-on the larger leaves, 2-18 cm in diam, succulent, green above, dark reddish-violet beneath, coriaceous. Inflorescences of many fascicled flowers, appearing umbellate, axillary. Flowers white, 1-8 cm long, pedicellate, the pedicels (mature) 3-7 cm long, succulent, glandular (?) dotted, erect to suberect; calyx-lobes lanceolate, acute to short apiculate at the apex, the margins scarious, 4.5-8 mm long; corolla 1-1.8 cm long, the lobes ovate to ovate-oblong, acute at the apex, very membranous, + transparent when dried, 8-12 mm long, conspicuously fimbriate, the hairs 1-3 mm long, the lobes fused near the base; stamens introrse, 5-7 mm long, the filaments ca 3-5 mm long, ? flattened, the anthers 2 mm long, sagittate and spreading at the base; pistil 9-12 mm long, the ovary ellipsoid, sessile, 3-5 mm long, the style cylindrical, the stigma lobes to 1 mm long, flattened. Capsules indehiscent and eventually rupturing irreguarly, ellipsoid, 4--6 mm long, ca 10-18-seeded the persistent style rostrate; seeds orbicular, slightly flattened dorsiventrally, 1-1.2 mm long, shiny.
Habit Herbs
Specimen CANAL ZONE: Barro Colorado I, shore line, quiet water, Croat 8215 (MO); Rio Chagres, Fairchild 2045 (MO); Madden Lake, Woodson & Schery 958 (MO). COCLE: El Valle de Anton & vic, in bogs, Seibert 440 (MO); betw Las Margaritas & El Valle de Anton, in bog, Woodson et al. 1753 (MO). PANAMA: along rd betw Panama & Chepo, in pools in savannas, Dodge et al. 16711 (MO); Sabanas, nr Chepo, in shallow pond, Hunter &S Allen 66 (MO), Hunter & Steyermark s.n. (MO); wet savanna E of Pacora, in lake, depth 1 m, Woodson et al. 752 (MO).
Distribution A common aquatic herb in the West Indies and Central and South America,
Note N. humboldtianum appears to be restricted to quiet and non-running waters. When growing in shallow bogs or marshes, the stems are considerably shortened. The length of the stem is apparently determined by the depth of the water in which it is growing. In marsh habitats in Panama the stems are ca 8-1 5 cm long (Seibert 440, Woodson et al. 1 753), while those growing in lakes have been ob- served to be as long as 1.5 m (Croat 8215). In addition to shorter stems, the marsh or bog plants of this species have smaller leaves than those plants which are found in lakes. The small-leaved populations were given varietal status (var. parvifolium) by Grisebach (Gen. Sp. Gent. 347, 1 839). Ornduff, in a treatment of the Meso-American and West Indian species of Nymphoides, suggests that N. humboldtiana is conspecific with the Old-World N. indica (L.) 0. Kuntze. He makes his case very strongly, but I prefer to hold to the later name until the taxonomy of the N. indica complex is completely worked out.
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