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Plants of Taiwan

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    台灣植物誌 第二版  Flora of Taiwan, 2nd edition    Vol. 4

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    台灣植物誌第二版  Flora of Taiwan, 2nd edition  4: 344

    There are about 25 species of Calystegia, mostly temperate but sparingly extending to the tropics; a single widespread seacoast species occurs in Taiwan.

    1. Calystegia soldanella (L.) R. Br., Prodr. 483. 1810; Chang, Fl. Taiwan 4: 349, pl. 1033. 1978.
    ر۪ Pl. 153, Photo 201

    Convolvulus soldanellus L., Sp. Pl. 159. 1753.

    Stems prostrate or ascending, glabrous. Leaves oblong to triangular, glabrous, thick-coriaceous, lustrous, 2-3 cm long, 3-5 cm wide, apex rounded or emarginate, base cordate or sagittate. Inflorescences axillary, 1-flowered or few-flowered cymes; pedicel 6-8 cm long, axillary, bracts widely ovate, 7-10 mm long; sepals linear-ovate, glabrous, apex obtuse, 6-8 mm long; corolla pink or purplish, ca. 2 cm long, funnelform; ovary l-locular, stigma ellipsoid, complanate. Capsule partly enclosed by persistent and thickened calyx, 1.2 cm across; seeds thick, black, ca. 7 mm long.

    Widely distributed in temperate coastal strand on all continents. Taiwan, found along sandy seashores in the north.

    TAIPEI: Sanchih, C. I. Peng 10363; Yehlin, Chung 2095.


    3. CUSCUTA L. 鵷l

    Herbs, parasitic, yellow or reddish, glabrous. Stems twining, filiform, obtaining nourishment from hosts by means of haustoria. Leaves reduced to minute scales. Flowers sessile or shortly pedicellate, mostly in globular, spicate, racemose, or cymose clusters, 4- or 5-merous; bracts minute or absent. Calyx gamosepalous, deeply lobed, or consisting of free sepals. Corolla white, pinkish, or cream-colored, urceolate, tubular, globose or campanulate, inside with fimbriate or crenulate, membranous, infrastaminal scales at base of tube. Stamens as many as corolla lobes, inserted on corolla above scales, alternating with corolla lobes. Pollen globose or ellipsoid, 3- or 4-colpate, not spiny. Ovary 2-loculed; each locule with 2 ovules; styles 1 or 2; stigmas 2, nearly globose or elongated, sometimes united. Capsule ovoid or globose, dry or sometimes fleshy, circumscissile or opening irregularly. Seeds 1-4, glabrous; embryo acotyledonous, filiform spiral-curved.

    Approximately 170 species, distributed mainly in North and South America, with a few species in Asia and Europe; three species occur in Taiwan. The genus is considered by some systematists to belong to a separate, monogeneric family, Cuscutaceae Dumortier.


    KEY TO SPECIES

    1. Flowers 4-7 mm long; corolla cylindrical; style 1 .................................. 3. C. japonica var. formosana
    1. Flowers ca. 2 mm; corolla short campanulate; styles 2.
    2. Infrastaminal scales deeply bifid; fruit not circumscissile ........................................ 1. C. australis
    2. Infrastaminal scales not deeply bifid; fruit circumscissile ....................................... 2. C. chinensis

    1. Cuscuta australis R. Br., Prodr. 491. 1810; Chang, Fl. Taiwan 4: 351, pl. 1034. 1978.
    鵷l Pl. 154, Photo 202

    Cucsuta obtusiflora Kunth var. australis Engelm., Trans. Acad. Sci. St. Louis 1: 492. 1859.
    Cuscuta kawakamii Hayata, Icon. Pl. Formosan. 5: 125. 1915.