EcoFlora - Rudbeckia triloba

Rudbeckia triloba L.
Family: Asteraceae Brown-Eyed-Susan, more...browneyed Susan Paul Rothrock	FNA Gleason & Cronquist Resources Lowell E. Urbatsch, Patricia B. Cox in Flora of North America (vol. 21) Perennials, to 150 cm (rhizomatous). Stems glabrate to hirsute or strigose (hairs 1-2 mm, basal retrorse, others spreading). Leaves: 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. Heads (10-30) in paniculiform arrays. Phyllaries to 1.5 cm (faces moderately hirsute). Receptacles conic to subhemispheric; paleae 5-6.5 mm, apices cuspidate (tips awnlike, 1.5+ mm), glabrous. Ray florets 8-15; laminae (corollas yellow to yellow-orange with basal maroon splotches) linear to oblanceolate, 8-30 × 3-8 mm, abaxially sparsely strigose. Discs 8-15 × 10-20 mm. Disc florets 150-300+; corollas yellowish green basally, otherwise brown-purple, 3-4 mm; style branches ca. 1.2 mm, apices obtuse to rounded. Cypselae 1.9-2.8 mm; pappi coroniform, to 0.2 mm. Vascular plants of NE US and adjacent Canada Biennial or short-lived perennial 5-15 dm, moderately hirsute or strigose to subglabrous; lvs thin, sharply toothed to subentire, the basal ones broadly ovate or subcordate and long-petiolate, the cauline mostly narrower and shorter-petiolate or sessile, usually some of the larger ones deeply trilobed or seldom even pinnatifid; rays 6-13, yellow or orange, 1-2(-2.5) cm; disk dark purple or brown, hemispheric or ovoid, 8-15 mm wide; receptacular bracts glabrous, abruptly narrowed to a short but distinct awn-tip often shortly surpassing the disk-cors; pappus a minute crown; 2n=38, 57, the triploid more northeastern. Woods and moist soil; Conn. to Mich., Io., and Nebr., s. to Fla. and Tex. June- Oct. Most of our plants belong to the widespread var. triloba, with the lvs often (not always) well over 5 cm, some of them generally trilobed with the lobes generally acute, rarely any of them pinnately lobed. The var. pinnatiloba Torr. & A. Gray occurs on the Gulf coast of w. Fla. and disjunct in the Blue Ridge of N.C. and sw. Va. (where it has been called R. beadlei Small). It is a smaller and more delicate plant, with the lvs to 5(-8) cm, some of them generally pinnately few-lobed, the lobes often obtuse. Gleason, Henry A. & Cronquist, Arthur J. 1991. Manual of vascular plants of northeastern United States and adjacent Canada. lxxv + 910 pp. ©The New York Botanical Garden. All rights reserved. Used by permission.
Open Interactive Map Paul Rothrock Paul Rothrock John Hilty USDA-NRCS PLANTS Database / Britton, N.L., and A. Brown. 1913. An illustrated flora of the northern John Hilty William S. Justice @ USDA-NRCS PLANTS Database Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Richard Hull Click to Display 100 Initial Media - - - - - View All Media