Helianthus maximiliani
hélianthe de maximilien, Maximilian sunflower, Maximilian's sunflower
erect, 5–30 dm, scabrous to scabro-hispidulous.
cauline; mostly alternate;
petioles 0–2 cm;
blades (light green to gray-green, 1-nerved, conduplicate) lanceolate, 10–30 × 2–5.5 cm, bases cuneate, margins usually entire, sometimes serrulate, abaxial faces scabrous to scabro-hispid, gland-dotted.
1–11 cm.
hemispheric, 13–28 mm diam.
10–25;
laminae (15–)25–40 mm.
75+;
corollas 5–7 mm, lobes yellow;
anthers dark brown or black;
appendages usually yellow, sometimes partly dark.
30–40, lanceolate, 14–20 × 2–3 mm, (margins ciliate) apices acute to attenuate, abaxial faces canescent, gland-dotted.
(1–)3–15 (often in racemiform to spiciform arrays).
3–4 mm, glabrate;
pappi of 2 aristate scales 3–4.1 mm.
7–11 mm, entire or 3-toothed (apices greenish, mucronate, hairy).
= 34.
Helianthus maximiliani
Helianthus maximiliani is introduced in eastern Ontario and in Quebec. It appears to be native to midcontinental prairie regions and has spread along railroads and highways into all areas of North America. Its wide dispersal may be aided by cultivation for its attractive, showy floral displays. In addition to the usually conduplicate, single-nerved leaves and spikelike arrangement of the heads, it is distinguished by the whitish-canescent indument of the leaves and stems and the long-attenuate phyllaries.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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