Flora of North America species comparison

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Euthamia gymnospermoides

Great Plains goldentop, Texas goldentop, viscid grass-leaf goldenrod
Habit Perennials or subshrubs, 40–150 cm.
Stems

(simple or branched) glabrous or with scabrous lines, not glaucous.
Leaves

usually ascending;

blades (1–)3- or -5-nerved, linear to lanceolate, 40–100(–120) × 1.4–4(–8) mm, lengths 12–49 time widths, gradually reduced distally, firm-herbaceous, margins scabrous, apices acuminate, faces abundantly and prominently gland-dotted (29–49 dots per mm²), glabrous or midveins with hairs.
Involucres

obconic, (4–)4.5–6.2 mm.
Ray florets

9–13(–16).
Disc florets

3–9;

corollas (3–)3.3–4.8 mm.
Phyllaries

usually green-tipped, outer ovate, inner linear-oblong, apices obtuse to acute (± strongly resinous).
Heads

(some or all) pedunculate (rarely all glomerate), usually in flat-topped to slightly rounded, arrays (25–)35–60% of plant heights.
2n

= 36, 54.

Euthamia gymnospermoides
Phenology Flowering Aug–Sep.
Habitat Open, dry to moist, sandy areas
Elevation 0–200 m (0–700 ft)
Distribution
from FNA
AR; CO; DE; FL; IA; IL; IN; KS; LA; MN; MO; NC; NE; OK; SC; SD; TX; VA; WI; ON
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Discussion

Some plants from the southern Great Lakes area with tendencies to shorter involucres and narrower leaves, called Euthamia gymnospermoides by H. A. Gleason and A. Cronquist (1991) and D. J. Sieren (1981), are better included in E. caroliniana.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 99.
Parent taxa Asteraceae > tribe Astereae > Euthamia
Sibling taxa
E. caroliniana, E. graminifolia, E. leptocephala, E. occidentalis
Synonyms E. camporum, E. chrysothamnoides, E. glutinosa, E. pulverulenta, Solidago gymnospermoides var. callosa, Solidago texensis
Name authority Greene: Pittonia 5: 75. (1902)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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