Rudbeckia triloba
brown-eyed susan, thin-leaf coneflower, three-leaf coneflower, three-lobed coneflower
glabrate to hirsute or strigose (hairs 1–2 mm, basal retrorse, others spreading).
blades ovate to subcordate or elliptic (not lobed), margins serrate, apices acute to acuminate, faces hirsute to strigose;
basal petiolate, 10–30 × 2–8 cm, bases truncate or rounded to cordate;
cauline petiolate or sessile, ovate to elliptic, proximal usually 3–5-lobed, 2–20 × 1.5–8 cm (smaller, fewer lobed distally), bases rounded to attenuate, sometimes clasping.
conic to subhemispheric;
paleae 5–6.5 mm, apices cuspidate (tips awnlike, 1.5+ mm), glabrous.
8–15;
laminae (corollas yellow to yellow-orange with basal maroon splotches) linear to oblanceolate, 8–30 × 3–8 mm, abaxially sparsely strigose.
150–300+;
corollas yellowish green basally, otherwise brown-purple, 3–4 mm;
style branches ca. 1.2 mm, apices obtuse to rounded.
to 1.5 cm (faces moderately hirsute).
(10–30) in paniculiform arrays.
1.9–2.8 mm;
pappi coroniform, to 0.2 mm.
8–15 × 10–20 mm.
Rudbeckia triloba
Varieties 3 (3 in the flora).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Cauline leaves (at least some) 5–7-lobed (Florida, Kentucky, North Carolina, Virginia) | var. pinnatiloba |
1. Cauline leaves (at least some) 3-lobed | → 2 |
2. Ray laminae 8–17 mm; discs 10–15 mm diam. (20–100 m; relatively widespread) | var. triloba |
2. Ray laminae 18–30 mm; discs 15–20 mm diam. (100–1200 m; Iowa, Kentucky, North Carolina, Tennessee) | var. rupestris |
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