Plants (50-)100-250 cm; rhizomes short. Stems 1-5, densely, evenly villoso-tomentose (hairs white, thin, crisped). Leaves: basal 0; mid and distal cauline lanceolate to narrowly lanceolate, 3-nerved, 50-80(-120) × 5-10(-12) mm, reduced distally to 10-20 mm, margins shallowly crenate or serrate to nearly entire, faces moderately to densely short pilose (hairs somewhat ascending). Heads 80-950, secund, in narrowly pyramidal paniculiform arrays, 3-4 times as long as wide, branches spreading and slightly secund, bracts linear-lanceolate, 3-6 mm. Peduncles moderately to densely villoso-strigillose, rarely sparsely minutely stipitate-glandular; bracteoles 1-2(-4). Involucres narrowly campanulate, 3-4 mm. Phyllaries in 3-4 series, oblong-lanceolate or lanceolate to narrowly elliptic, strongly unequal, margins apically ciliate, glabrous, rarely outer sparsely, minutely stipitate-glandular. Ray florets 7-15; laminae 1-2(-3) × 0.1-0.6 mm. Disc florets 5-9; corollas 2.8-3 mm, lobes 0.4-1.1 mm. Cypselae (narrowly obconic) 1.4-1.6 mm, sparsely strigillose; pappi ca. 3 mm. 2n = 18.

Flowering Feb-Apr and Aug-Oct(-Nov). Wet soils along streams and lake edges, in grasslands, oak and oak-pine woods; 300-1000+[-2200] m; Tex.; Mexico (Chihuahua, Coahuila, Nuevo Leon).

Solidago juliae is found on the Edwards Plateau and in Trans-Pecos Texas and adjacent Mexico. G. L. Nesom (1989e) discussed its nomenclatural history and reasons for treating it as a distinct species.