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Rudbeckia grandiflora
Rudbeckia grandiflora
Gmel. ex DC.
Family:
Asteraceae
Flora of North America
Resources
Lowell E. Urbatsch, Patricia B. Cox in Flora of North America (vol. 21)
Perennials,
to 120 cm (roots fibrous, caudices often woody).
Stems
proximally glabrous or sparsely hairy (hairs spreading), distally strigose (hairs ascending).
Leaves:
blades elliptic, lanceolate, or ovate (± conduplicate, not lobed), bases cuneate to rounded, margins entire or remotely serrate, apices acute, faces strigose, abaxially gland-dotted; basal petiolate, 10-35 × 2-11 cm; cauline petiolate (proximal) to nearly sessile (distal), 4-30 × 1.5-9 cm.
Heads
mostly borne singly.
Phyllaries
to 15 mm (strigose and gland-dotted).
Receptacles
hemispheric to ovoid; paleae 5-6.5 mm, (apical margins glabrous) acuminate-cuspidate, awn-tipped, abaxial tips sparsely strigose.
Ray florets
12-25; laminae elliptic to obovate (reflexed), 20-50 × 5-10 mm, abaxially hairy and gland-dotted.
Discs
10-30 × 15-25 mm.
Disc florets
200-800+; corollas greenish yellow basally and in lobes, otherwise maroon, 3.5-5 mm; style branches ca. 1.8 mm, apices obtuse.
Cypselae
2-3 mm;
pappi
coroniform, to 0.5 mm.
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