生活型

herb

形態特徵

• Rhizome with numerous branching scars and scale leaves, sending out stolons which develop new plantlets. Fertile branches many, petiole-like, highly variable in length. Petiole short, to 2 cm long.
• Leaves blade ovate-orbicular, rounded, deeply cordate at base with narrow sinuses, to ca. 12 cm across, abaxially densely glandular dotted.
• Flowers bisexual, 1.2-1.5 cm in diameter, 6-10 clustered at nodes, 4-5-merous. Pedicels 3-5 cm long. Calyx deeply 4-5-lobed to near base; lobes ca. 3 mm long, ovate-lanceolate, apex obtuse, margins hyaline. Corolla white with a yellow throat; lobes 4-5, oblong-lanceolate, up to 7 mm long, surface and margins densely fimbriate, with multicellular, cotton-like outgrowths. Stamens as many as corolla lobes, inserted in the throat of the corolla, each with a small tufts of glandular hairs. Pistil bottle-shaped; style 4-grooved; hypogynous disc glands as many as stamens, orbicular, cililolate at tips with papillose hairs.
• Capsules lacking.
• Chromosome number 2n = 3x = 27. <li><i>Nymphoides lungtanensis</i> is most closely related to <i>N. indica</i> which is also distributed in Taoyuan County. Both have a white corolla with a yellow throat and densely fimbriate petal with multicellular, cotton-like outgrowths. However, this new species can be distinguished from <i>N. indica</i> by its smaller leaves (up to 12 cm across), smaller flower (1.2-1.5 cm across), 4-grooved stigma, and chromosome number being 2n = 3x = 27. On the Other hand, <i>Nymphoides indica</i> of the Old World has bigger leaves (up to 20 cm across), bigger flowers (2.5 cm across), bilobed stigma, capsules and seeds present, and chromosome number 211 = 2x =18.</li> <li><i>Nymphoides lungtanellsis</i> is sterile and can only reproduce vegetatively, forming large, uniform colonies. Because habitat was destroyed, this new species is very rare now.</li>

引證標本

Taoyuan Hsien: Lungtan Hsiang, Lungmei Road, C. C. Lin 170 (Holotype: TAIF).

引用文獻

• Sung-Po Li, Tsung-Hsin Hsieh and Chun-Chi Lin, Taiwania 47(4): 246-258. 2002.