Southern Goldenrod

Solidago confinis is similar to S. spectabilis and was treated by A. Cronquist (1994) as a variety of that species.

Plants 30–210 cm; caudices branching, thick, woody. Stems 1–10+, ascending-erect, glabrous, often short fascicles of leaves present at nodes in axes of distal cauline leaves. Leaves: rosettes present at flowering; basal and proximal cauline tapering to elongate, winged petioles, bases nearly sheathing stems, blades linear-lanceolate, 50–260 (including petiole) × 5–45 mm, somewhat fleshy (fresh), margins entire, faces glabrous; mid and distal cauline crowded (robust plants), sessile, blades linear-lanceolate to lanceolate, 20–130 × 5–10(–25) mm, reduced distally, margins entire, apices acute to attenuate, glabrous. Heads 70–320, usually not secund, in thyrsiform-paniculiform arrays, sometimes apically secund, 5–25(–50) × 2–14 cm; branches ascending to arching. Peduncles 2–8 mm, glabrous or sparsely strigose; bracteoles 1–3, distally grading into phyllaries . Involucres campanulate, 2.5–4 mm. Phyllaries in 3–4 series, linear-triangular, unequal, margins involute near tip, sharply acute, the outer ¹ / 3 – ² / 3 length of inner (1–3 × 0.4–0.9 mm), midribs usually enlarged and translucent. Ray florets 8–12; laminae 1–2.5 × 1 mm. Disc florets 10–20; corollas 3–4 mm, lobes 1–1.5 mm. Cypselae (narrowly obconic) 2 mm (5–7 broad ribs lighter than body), sparsely to moderately strigose; pappi 2–3 mm. 2n = 18.

Solidago confinis var. luxurians (H. M. Hall) Jepson; S. spectabilis A. Gray var. confinis (A. Gray) Cronquist

Solidago confinis, commonly called southern goldenrod, is a North American species of flowering plants in the family Asteraceae. It is native to California, southern Nevada, and Baja California.

Solidago confinis is a perennial herb sometimes as much as 200 cm (80 inches) tall, with a thick, woody underground caudex. One plant can produce up to 320 small yellow flower heads in a showy, branching array at the top of the stem.

Solidago confinis là một loài thực vật có hoa trong họ Cúc. Loài này được A.Gray miêu tả khoa học đầu tiên năm 1882.