Juncus validus Coville

Herbs, perennial, rhizomatous, sometimes to nearly cespitose, 4--10 dm. Rhizomes not tuberous, 2 mm diam. Culms erect, terete, 3--5 mm diam., smooth. Cataphylls 0. Leaves: basal 2--3(--6), cauline 1--4; auricles 1--3 mm, apex acute, membranaceous, absent on proximal leaves; blade green, laterally compressed, 9--70 cm x 2--6 mm. Inflorescences terminal panicles of 10--30 heads, 10--30 cm, branches spreading; primary bract erect; heads 20--30-flowered, spheric, (10--)12--15 mm diam. Flowers: tepals green to reddish, lance-subulate, 4--5 mm, apex acuminate; stamens 3, anthers 1/3--1/2 filament length. Capsules exserted, straw-colored, 1-locular, subulate, 4--5,5 mm, tapering to subulate tip, valves separating or not at dehiscence; fertile throughout or only proximal to middle.. Seeds broadly ellipsoid, 0.5--0.6 mm, not tailed; body clear yellow-brown.

Juncus crassifolius Buchenau, Bot. Jahrb. Syst. 12: 326. 1890, not Bosc ex Laharpe (1827)

Juncus validus, the roundhead rush, is a species of flowering plant in the family Juncaceae, native to the central and southeastern United States. It is a somewhat weedy species, found along wet roadsides and in ditches.

Juncus validus là một loài thực vật có hoa trong họ Juncaceae. Loài này được Coville mô tả khoa học đầu tiên năm 1895.