Juncus secundus Beauv. ex Poir.

Herbs, short-lived perennial, cespitose, 1.5--7 dm. Culms 1--30. Leaves basal, (1--)2--3; auricles 0.2--0.4(--0.6) mm, scarious; blade flat, 10--30 cm x 0.5--1 mm, margins entire. Inflorescences 5--15(--30)-flowered, usually somewhat loose, 1--5 cm; primary bract usually shorter than inflorescence. Flowers: chiefly along inner side of branches; bracteoles 2; tepals greenish, lanceolate, 3.3--4.4 mm; outer and inner series equal, apex acuminate; stamens 6, filaments 0.5--0.9 mm, anthers 0.4--0.8 mm; style 0.1--0.2 mm. Capsules tan or light brown, 3-locular, ellipsoid, (3.3--)3.8--4.7 mm, nearly equal to tepals. Seeds tan, ellipsoid to lunate, 0.5--0.6(--0.7) mm, not tailed. 2n = ca. 80.

Flowering and fruiting spring. Exposed sites, usually with well-drained sandy soil, often associated with shallow bedrock; N.S., Ont.; Ala., Ark., Conn., Del., Ga., Ill., Ind., Ky., La., Maine, Md., Mass., Mo., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., Tenn., Vt., Va., W.Va.

Juncus secundus, the lopsided rush, one-sided rush, or second rush, is a species of flowering plant in the family Juncaceae, native to eastern North America and introduced to Primorsky Krai in Russia. It is typically found in serpentine, granite, and other barrens.

Juncus secundus là một loài thực vật có hoa trong họ Juncaceae. Loài này được P.Beauv. ex Poir. mô tả khoa học đầu tiên năm 1813.