Euthamia leptocephala
Euthamia graminifolia
bushy goldentop, Mississippi Valley goldentop
common goldentop, common grass-leaf-goldenrod, flat-top goldentop, fragrant goldenrod, grass-leaf goldenrod, grass-leaf goldentop, verge d'or à feuilles de graminées
(erect, striate-angled) glabrous, not glaucous.
(commonly branched in distal 1/4) glabrous or densely spreading-hirtellous, not glaucous.
ascending to spreading-ascending;
blades 3- or -5-nerved, lanceolate to narrowly lanceolate, 40–80 × 3–6(–9) mm, lengths 8–18 times widths, abruptly reduced distally, firm-herbaceous, margins scabrous, apices mostly acute, faces glabrous, little and obscurely gland-dotted (9–29 dots per mm²), sometimes pustulate.
spreading to ascending;
blades 3- or 5-nerved, linear to lanceolate, 37–130 × (2.1–)3–12 mm, lengths 7–20 times widths, abruptly to gradually reduced distally, herbaceous to firm-herbaceous, margins scabro-ciliate, apices obtuse to acuminate, faces usually little and obscurely gland-dotted (26–47 dots per mm²), barely viscid (more so on exposed shores), glabrous or densely spreading-hirtellous.
obconic, 4–6 mm.
broadly campanulate to campanulate, 3–5.3 mm.
usually 7–14.
(7–)17–22(–35).
3–6;
corollas 3.3–4.4 mm.
(3–)5–7(–13);
corollas 2.6–3.4 mm.
yellowish at bases, usually green-tipped, outer narrowly ovate, inner nearly linear, apices rounded to subacute (sometimes slightly resinous).
often ± yellow basally, outer (at least) usually green-tipped, outer ovate, inner oblong, apices obtuse or broadly acute.
glomerate or pedunculate, in compact, usually round-topped arrays 6–35% of plant heights.
glomerulate, usually in flat-topped arrays (1.5–28 cm diam.), 10–28% of plant heights (branches unequal, giving irregular, broken appearance).
= 18.
= 18.
Euthamia leptocephala
Euthamia graminifolia
I have seen no specimens of Euthamia leptocephala from Kentucky; it is to be expected there.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Plants with densely hairy leaves and stems have been called var. nuttallii. Though extremes are distinct, the plants cannot be reliably separated rangewide from typical Euthamia graminifolia. Plants called var. major have been distinguished primarily on the basis of leaf dimensions (lengths 8–11 times widths in var. major versus 11–20 in typical E. graminifolia). Overlap is extensive; no discrete boundaries can be drawn.
Euthamia hirtipes was described as a putative hybrid involving a hairy E. graminifolia and a small-headed E. caroliniana (M. L. Fernald 1946d). It combines broad, hairy leaf blades with few-flowered heads, a condition that is not intermediate between the putative parents. D. J. Sieren and J. F. Merrit (1980) and C. E. Taylor (1975) reviewed the plants. Until evidence can be supplied to the contrary, E. hirtipes should be considered a synonym of E. graminifolia.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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