Brittonia 30: 493. 1978.
Biennials (rarely perennials), 30–100 (–200) cm; taprooted (rarely perennating by production of basal rosettes). Stems erect (often reddish purple), usually simple, glabrous. Leaves: basal blades oblanceolate to linear, 15–70 × 1–7 mm, faces glabrous or densely woolly; proximal cauline often becoming black and twisted; cauline blades linear or linear-lanceolate to oblong, flat, slightly undulate, or twisted, bases tapering to rounded, margins entire, eciliate, occasionally undulate, apices acute, faces glabrous. Heads (4–) 20–100 in subumbelliform to compact, paniculiform or loosely open corymbiform arrays. Peduncles 2–8 cm, glabrous; bracteoles 1–3, linear, glabrous. Involucres campanulate, 6–10 (–12) mm. Phyllaries in 4–5 series, erect, linear-lanceolate, unequal, 0.6–1.1 mm wide, apices, acute-appressed, acuminate to long-acuminate, faces glabrous, bases of outer sparsely stipitate-glandular. Ray-florets 10–30; laminae 9–12 mm. Disc-florets 35–60; corollas 5–6 mm, lobes 0.5–1 mm. Cypselae (stramineous) 2–2.5 mm, 2–6-ridged (ridges golden yellow to redbrown, translucent, clavate), weakly ribbed, faces sparsely strigose to sometimes only proximally so; pappi in 3 series, outer of linear to narrowly triangular scales 0.5–1 mm, inner of 20–35 bristles 4–6 mm, inner moderately clavate. 2n = 10.
Subspecies 2 (2 in the flora).
Chrysopsis linearifolia is disjunct between the central and western panhandle and the central peninsula.
|1||Heads 20–100, in compact subumbelliform to paniculiform arrays; stems often dark purple, 30–200 cm; leaves numerous (to 200 on tall plants), linear to narrowly linear (lengths more than 10 times widths), flat or slightly undulate or twisted; panhandle Florida 9a. Chrysopsis linearifolia subsp. linearifolia||> 1|
|1||Heads 4–30(–50) in open corymbiform arrays; stems 30–80 cm, green to dark purple; leaves less numerous (to 100 on tall plants), linear to linear-lanceolate or elliptic, sometimes undulate, strongly twisted; c, w peninsular Florida||Chrysopsis linearifolia subsp. dressii|
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