Sicyos angulatus L. (Synonym : Sicyos acutus Raf.)

Family : Cucurbitaceae [Naturalized plant]

Sida rhombifolia L. (Synonym : Napaea rhombifolia (L.) Moench)

Family : Malvaceae [Naturalized plant]

Sida spinosa L. (Synonym : Sida subdistans A.St.-Hil. & Naudin)

Family : Malvaceae [Naturalized plant]

Sigesbeckia glabrescens (Makino) Makino (Synonym : Sigesbeckia glabrescens (Makino) Makino var. leucoclada Nakai)

Family : Asteraceae

Sigesbeckia orientalis L. (Synonym : Sigesbeckia orientalis L. f. angustifolia Makino)

Family : Asteraceae

Sigesbeckia orientalis L. subsp. pubescens (Makino) H.Koyama (Synonym : Sigesbeckia orientalis L. var. pubescens (Makino) Makino)

Family : Asteraceae

Silene antirrhina L. (Synonym : Silene antirrhina L. var. confinis Fernald)

Family : Caryophyllaceae [Naturalized plant]

Silene aprica Turcz. ex Fisch. & C.A.Mey. (Synonym : Silene taquetii H.Lév.)

Family : Caryophyllaceae

Silene aprica Turcz. ex Fisch. & C.A.Mey. var. oldhamiana (Miq.) C.Y.Wu (Synonym : Silene aprica Turcz. ex Fisch. & C.A.Mey. subsp. oldhamiana (Miq.) C.Y.Wu)

Family : Caryophyllaceae

Silene armeria L. (Synonym : Lychnis armoraria Scop.)

Family : Caryophyllaceae