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Flora of Taiwan | Family List | Primulaceae | Lysimachia

Lysimachia japonica Thunb., Fl. Jap. 83. 1784; Kao & DeVol, Fl. Taiwan 4: 77. pl. 921. 1978; Chen et al., Fl. Reip. Pop. Sin. 59(1): 65. 1989; Hu & Kelso, Fl. China 15: 60. 1996.


Lysimachia japonica

Credit: HAST

Lysimachia japonica Thunb. var. formosana (Honda) S. S. Ying, Colour. Illustr. Pl. Taiwan, Pt. 4; Colour. Illustr. Herbac. Pl. Taiwan, Vol. 1: 152. 1980.

A prostrate or decumbent, perennial herb; stems angular, pubescent. Leaves opposite, ovate to nearly reniform, with pellucid dots, 1-3 cm long, 1-1.5 cm wide, rounded or acute at apex, rounded or cuneate at base, the petioles 4-8 mm long. Flowers axillary, yellow, 5-7 mm across; pedicels 3-8 mm long, pubescent; sepals 5, linear-lanceolate, pubescent; corolla lobes obovate, 5-7 mm long, without black dots on corolla-lobes, but with pellucid dots. Capsules brown, globose, pubescent, shorter than calyx, longitudinally dehiscent; seeds black.

TAIPEI: Yangmingshan, Liu 222, Nankang, Peng 9353. KEELUNG: Wutu, Peng 12986; Hoping Island, Wang 925. HSINCHU: Shihtoushan, Peng 14841. NANTOU: Lushan, Kao 7954; Sun Moon Lake, Kuo 8853.

Distributed in Japan, the Ryukyus, Malaysia, and SE China. Taiwan in field and roadside in lowlands to medium altitudes, in the central and northern parts. Flowering mostly in February to April.

Phenology: perennial

Life form: herb

Root: rooting at node or not: rooting at node

Stem: present

Stem: type: decumbent, prostrate at base

Stem: shape: angled

Stem: indumentum: hairy

Leaf: position: cauline

Phyllotaxy: opposite

Leaf: petiole: petiolate

Leaf: petiole length (mm): 3-8

Leaf: blade shape: ovate, reniform

Leaf: blade apex: acute, rounded

Leaf: blade base: rounded, cuneate

Leaf: blade margin: entire

Leaf: blade surface: dotted

Leaf: blade texture: herbaceous

Leaf: blade length (mm): 10-15

Leaf: blade width (mm): 10-15

Inflorescence: solitary

Inflorescence: position: axillary

Scape: absent

Peduncle: length (mm): 3-8

Bract: absent

Calyx: shape: 5-parted

Sepal: shape: linear, lanceolate

Sepal: margin: entire

Sepal: length (mm): 4-8

Sepal: width (mm): 1-2.5

Corolla: color: yellow

Corolla: shape: rotate

Lobe: margin: entire

Lobe: length (mm): 3-7

Lobe: width (mm): 2-3

Filament fused into a ring or not: filament fuse to a ring

Filament and anther relative length: filament about equal to anther

Stamens protruding from corolla or not: Stamens protuding from corolla

Capsule: dehiscence type: longitudinal

Distribution: low elevation cultivated field, mid elevation


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