Flora of North America species comparison

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Oreochrysum

goldenrod
Habit Perennials 15–60(–100) cm; rhizomes long, slender, scale-leaved, thickening, becoming woody.
Stems

erect, usually simple, minutely puberulous or hirtellous, stipitate-glandular.
Leaves

basal and cauline (basal and proximal cauline persistent); alternate;

petiolate to subpetiolate;

basal and proximal cauline blades 1-nerved, spatulate-oblanceolate, mid and distal elliptic to broadly ovate-lanceolate or oblanceolate, margins entire (apices acute to obtuse or rounded), minutely, short-stipitate-glandular or gland-dotted, viscid.
Involucres

campanulate to hemispheric, 10–11 × 6–8 mm.
Receptacles

flat, pitted, epaleate.
Ray florets

12–20, pistillate, fertile;

corollas yellow.
Disc florets

25–37, bisexual, fertile;

corollas yellow, tubes shorter than narrowly tubular-funnelform throats, lobes 5, erect to spreading, triangular;

style-branch appendages linear.
Phyllaries

15–24 in 3–4 series, mostly appressed, 1-nerved (rarely with lateral pair; convex proximally, flat beyond), outer lanceolate to ovate, inner broadly lanceolate-oblong, strongly unequal to subequal, herbaceous, slender (apices green-tipped and erect to reflexing), glabrous or hirtellous, minutely stipitate-glandular, non-resinous.
Heads

radiate, in distinctly flat-topped, tightly corymbiform arrays.
Cypselae

fusiform, plump but distinctly compressed, nerves 12–16 (whitish, raised), glabrous;

pappi persistent, of 40–60, equal, barbellate, apically attenuate bristles in 2(–3) series.
x

= 9.

Oreochrysum
Distribution
from USDA
w North America; n Mexico
[BONAP county map]
Discussion

Species 1.

Oreochrysum often has been treated as Solidago parryi; J. C. Semple et al. (1999) placed Oreochrysum at subgeneric rank within Solidago. Oreochrysum is separated from Solidago on the basis of its stipitate-glandular vestiture, large heads in strongly corymbiform arrays, herbaceous phyllaries, prominent rays, narrow disc corollas with relatively short lobes, linear-lanceolate style-branch appendages, and large cypselae. It has no apparent close relatives within Solidago.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 20, p. 166. Treatment author: Guy L. Nesom.
Parent taxa Asteraceae > tribe Astereae
Subordinate taxa
O. parryi
Synonyms Haplopappus section O., Solidago subg. O.
Name authority Rydberg: Bull. Torrey Bot. Club 33: 152. (1906)
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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