Prenanthes altissima Linnaeus (Q6251)

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Prenanthes altissima is a synonym of Nabalus altissimus (Linnaeus) Hooker
Language Label Description Also known as
English
Prenanthes altissima Linnaeus
Prenanthes altissima is a synonym of Nabalus altissimus (Linnaeus) Hooker

    Statements

    taxon/id/Prenanthes altissima Linnaeus
    0 references
    taxon synonym
    Tall rattlesnakeroot (English)
    prenanthe élevée (English)
    Flowering Aug–Nov.
    open deciduous hardwood
    mixed woods
    shaded slopes
    bluffs
    disturbed areas
    Plants 40–250 cm;
    taproots thickened, knotty, tuberous.
    Stems erect, greenish to purplish, glabrous proximally, often tomentulose distally.
    Leaves: proximal present at flowering;
    blades usually ovate or triangular, 4–15 × 2–16 cm, thin, bases truncate to hastate or cordate, margins entire or shallowly dentate, often deeply 3-lobed, faces glabrous or with scattered hairs on veins;
    distal reduced in size and lobing.
    Involucres cylindric, 9–14 × 2–3 mm.
    Calyculi of 4–6, blackish, triangular bractlets 1–4 mm, glabrous.
    Phyllaries (4–) 5 (–6), pale green, often blackish at bases and apices, linear to lanceolate, 10–12 mm, glabrous or sparsely hairy.
    Florets (4–) 5 (–6);
    corollas pale-yellow to greenish yellow, 7–15 mm.
    Cypselae brown to tan, subcylindric, subterete, 4–5 mm, indistinctly 5–10-ribbed;
    pappi usually whitish or pale-yellow, sometimes reddish-brown, 5–6 mm. 2n = 16.