A prostrate or decumbent, perennial herb; stems angular, pubescent. Leaves opposite, ovate to rhomboid-ovate, 2-3 cm long, 1-1.5 cm wide, the upper surface dark green, the under surface pale, without pellucid dots, obtuse or acute at apex, attenuate at base, the margins entire; petioles 10 mm long. Flowers yellow axillary, the pedicels 5-10 mm long, pubescent; sepals 5, lanceolate, acuminate, 7-12 mm long pubescent. Corolla deeply 5- parted, the lobes obovate, 8 mm long, 506 mm wide, rounded at apex, the margins denticulate. Capsules brown, globose, pubescent, shorter thean the calyx, longitudinally dehiscent. Flowers: Mar.- Jun.

TAIPEI: Kungliao, Peng 14956; Pitou, Peng 10864. KEELUNG: Hopingdao, Peng 4822. ILAN: Wushihpi, Peng 10816. HSINCHU: Chutung, Peng 13718; Shanchiao, Peng 10381. MIAOLI: Chunan to Fouten, Hsu 4344; Hsihu, Peng 13959.

Distributed in SE China. Taiwan, along coastal hills and fields in the northern and central part of the island.

Phenology: perennial

Life form: herb

Root: rooting at node or not: rooting at node

Stem: present

Stem: type: decumbent, prostrate at base

Stem: shape: terete

Stem: indumentum: hairy

Leaf: position: cauline

Phyllotaxy: opposite

Leaf: petiole: petiolate

Leaf: petiole length (mm): 5-10

Leaf: blade shape: ovate, rhomboid

Leaf: blade apex: obtuse, acute

Leaf: blade base: attenuate

Leaf: blade margin: entire

Leaf: blade surface: glabrous

Leaf: blade texture: herbaceous

Leaf: blade length (mm): 15-30

Leaf: blade width (mm): 8-16

Inflorescence: solitary

Inflorescence: position: axillary

Scape: absent

Peduncle: length (mm): 5-15

Bract: absent

Calyx: shape: 5-parted

Sepal: shape: lanceolate

Sepal: margin: entire

Sepal: length (mm): 4-8

Sepal: width (mm): 1-1.3

Corolla: color: yellow

Corolla: shape: rotate

Lobe: margin: entire

Lobe: length (mm): 6-8

Lobe: width (mm): 3-6

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

Filament inserted position: base of corolla lobe

Filament: indumentum: glabrous

Filament and anther relative length: filament obviously shorter than anther

Stamens protruding from corolla or not: Stamens protuding from corolla

Capsule: dehiscence type: longitudinal

Distribution: seashores