Helenium microcephalum var. oöclinium

(A. Gray) Bierner

Sida 5: 47. 1972.

Basionym: Helenium oöclinium A. Gray Proc. Amer. Acad. Arts 9: 202. 1874
Treatment appears in FNA Volume 21. Treatment on page 434.

Plants 25–80 cm. Leaves: proximal and mid-blades serrate to undulate-serrate to occasionally deeply toothed or laciniate, glabrate; distal blades glabrous or sparsely to moderately hairy. Heads 20–100+ per plant. Peduncles 1.5–8 cm, usually projecting terminal heads well beyond foliage. Involucres 8–12 × 8–12 mm. Ray-florets 9–13; corollas usually yellow throughout, sometimes reddish proximally and yellow distally, 2.7–9.1 × 1.5–6.7 mm. Disc-florets 200–400+; corollas 1.7–2.4 mm, lobes 5. Pappi 0.4–0.7 mm. 2n = 26.


Phenology: Flowering (Mar–)Apr–Jun(–Dec).
Habitat: Sandy or clay soils, ditches, washes, around ponds and lakes, along streams
Elevation: 500–1900 m

Distribution

V21-1088-distribution-map.gif

Tex., Mexico (Coahuila), Mexico (Nuevo León), Mexico (Durango), Mexico (San Luis Potosí)

Discussion

Selected References

None.

Lower Taxa

None.
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 +
(A. Gray) Bierner +
decurrent +
Helenium oöclinium +
compound +  and simple +
pinnatifid;lobed;spatulate;ovate;spatulate;ovate;oblong;oblanceolate;linear;lanceolate;elliptic +
winged;ribbed;winged;ribbed +
tuberculate +  and rugose +
barbellulate +  and barbellate +
reddish proximally and yellow +  and yellow +
0.27 cm2.7 mm <br />0.0027 m <br /> (0.91 cm9.1 mm <br />0.0091 m <br />) +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.24 cm2.4 mm <br />0.0024 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.67 cm6.7 mm <br />0.0067 m <br />) +
4-5-angled +  and obpyramidal +
fertile +  and bisexual +
fertile +  and bisexual +
glabrous or +  and sparsely moderately hairy +
Tex. +, Mexico (Coahuila) +, Mexico (Nuevo León) +, Mexico (Durango) +  and Mexico (San Luis Potosí) +
500–1900 m +
gland-dotted +
glabrous or +  and sparsely densely hairy +
pistillate +, staminate +  and neuter +
winged +  and beaked +
dispersed +
Sandy or clay soils, ditches, washes, around ponds and lakes, along streams +
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 /> (1.2 cm12 mm <br />0.012 m <br />) +
0.8 cm8 mm <br />0.008 m <br /> (1.2 cm12 mm <br />0.012 m <br />) +
sessile +  and petiolate +
glabrous or +  and sparsely moderately 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 +
0.04 cm0.4 mm <br />4.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
1.5 cm15 mm <br />0.015 m <br /> (8 cm80 mm <br />0.08 m <br />) +
Flowering (Mar–)Apr–Jun(–Dec). +
9 +  and 34 +
bearing subulate enations +, hairy +  and bristly +
ovoid;hemispheric;ovoid;hemispheric;globose;conic +
0.02 cm0.2 mm <br />2.0e-4 m <br /> (0.03 cm0.3 mm <br />3.0e-4 m <br />) +
5 +  and 12 +
non-aristate +
0.03 cm0.3 mm <br />3.0e-4 m <br /> (0.07 cm0.7 mm <br />7.0e-4 m <br />) +
exalbuminous +
winged +  and branched +
2 (?) +  and 10 (?) +
appendaged +  and truncate +
hirsutulous +  and glabrous +
papillate +
Compositae +
Helenium microcephalum var. oöclinium +
Helenium microcephalum +
variety +
urceolate +  and campanulate +
dilated +
toothed +  and entire +
25 cm250 mm <br />0.25 m <br /> (120 cm1,200 mm <br />1.2 m <br />) +