Helenium virginicum

S. F. Blake

Claytonia 3: 13. 1936.

Common names: Virginia sneezeweed
EndemicConservation concern
Treatment appears in FNA Volume 21. Treatment on page 431. Mentioned on page 428.

Perennials, 30–130 cm. Stems 1 (–2), branched distally, strongly winged, glabrous or sparsely to moderately hairy proximally, glabrous or sparsely hairy distally. Leaves glabrous or sparsely to densely hairy; basal blades oblanceolate, weakly to strongly lobed; proximal and mid-blades oblanceolate to lanceolate, usually entire, sometimes dentate; distal blades usually lanceolate, entire. Heads 2–25+ per plant, in paniculiform arrays. Peduncles 2–8 cm, sparsely to moderately hairy. Involucres globoid, 8–15 × 10–16 mm. Phyllaries (connate proximally) sparsely to moderately hairy. Ray-florets 8–13, pistillate, fertile; corollas yellow, 10–15 × 4–10 mm. Disc-florets 200–400+; corollas yellow proximally, yellow to yellowbrown distally, 2.5–3.5 mm, lobes 5. Cypselae 1.8–2.3 mm, moderately hairy; pappi of 5–6 entire, aristate scales 1.3–2 mm.


Phenology: Flowering Jul–Sep.
Habitat: Around ponds, lakes, and bogs, swampy meadows
Elevation: 300–500 m

Discussion

Of conservation concern.

M. C. Simurda and J. S. Knox (2000) presented ITS sequence data that placed a population of Helenium virginicum from the Ozark highlands of southern Missouri in a monophyletic group with six populations of H. virginicum from the Shenandoah Valley of Virginia. R. L. Rimer and J. W. Summers (Missouri Department of Conservation, pers. comm.) located 42 H. virginicum populations in six counties in the Ozark highlands of Missouri. G. A. Yatskievych (Missouri Botanical Garden, pers. comm. to editors) has stated, “. . . the existence of this taxon in Missouri is no longer a matter of a single odd population, but probably rather another case of a taxon with two disjunct centers following dissection of a range during the Pleistocene glaciation.”

Helenium virginicum is in the Center for Plant Conservation’s National Collection of Endangered Plants.

Lower Taxa

None.
... more about "Helenium virginicum"
not tailed +, rounded +  and obtuse +
connate +  and distinct +
subequal +
scarious +
usually ovate +  and lanceolate +
usually deltate +  and lanceolate +
paniculiform +
indeterminate +  and determinate +
Mark W. Bierner +
S. F. Blake +
lobed +  and oblanceolate +
decurrent +
compound +  and simple +
pinnatifid;lobed;spatulate;ovate;spatulate;ovate;oblong;oblanceolate;linear;lanceolate;elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
Virginia sneezeweed +
yellow +  and yellowbrown +
1 cm10 mm <br />0.01 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
0.25 cm2.5 mm <br />0.0025 m <br /> (0.35 cm3.5 mm <br />0.0035 m <br />) +
0.4 cm4 mm <br />0.004 m <br /> (1 cm10 mm <br />0.01 m <br />) +
4-5-angled +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
Mo. +  and Va. +
300–500 m +
gland-dotted +
glabrous or +  and sparsely densely hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Around ponds, lakes, and bogs, swampy meadows +
discoid +  and radiate +
indeterminate +
homogamous +  and heterogamous +
each +  and sessile +
0.4 cm4 mm <br />0.004 m <br /> (3.4 cm34 mm <br />0.034 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.5 cm15 mm <br />0.015 m <br />) +
ovoid;obconic;ovoid;obconic;hemispheric;globose +
1 cm10 mm <br />0.01 m <br /> (1.6 cm16 mm <br />0.016 m <br />) +
sessile +  and petiolate +
glabrous or +  and sparsely densely hairy +
deltate +
dentate to pinnatifid or palmatifid +  and entire +
connate +  and distinct +
ovate +, oblong +, oblanceolate +, linear +, lanceolate +  and elliptic +
unequal +  and subequal +
2-carpellate +
persistent +
2 cm20 mm <br />0.02 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Flowering Jul–Sep. +
9 +  and 34 +
bearing subulate enations +, hairy +  and bristly +
ovoid;hemispheric;ovoid;hemispheric;globose;conic +
simurda2000a +
5 +  and 6 +
aristate +
0.13 cm1.3 mm <br />0.0013 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
exalbuminous +
Endemic +  and Conservation concern +
winged +  and branched +
1 (?) +  and 2 (?) +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Helenium virginicum +
Helenium +
species +
urceolate +  and campanulate +
dilated +
toothed +  and entire +
30 cm300 mm <br />0.3 m <br /> (130 cm1,300 mm <br />1.3 m <br />) +
shrub +  and subshrub +