Helenium microcephalum var. microcephalum
Treatment appears in FNA Volume 21. Treatment on page 434.
Plants 30–120 cm. Leaves: proximal and mid-blades serrate to undulate-serrate, glabrous or sparsely hairy; distal blades glabrous or sparsely hairy. Heads 20–150 (–300+) per plant. Peduncles 1–3.5 cm, projecting terminal heads barely beyond foliage. Involucres 4–8 × 4–8 mm. Ray-florets 7–13; corollas yellow, 2.6–4.8 × 1.6–3.9 mm. Disc-florets 120–300+; corollas 1.2–1.6 mm, lobes (4–) 5. Pappi (0.2–) 0.3–0.4 (–0.5) mm. 2n = 26.
Phenology: Flowering (Feb–)Jun–Jul(–Nov).
Habitat: Sandy or clay soils, ditches, washes, around ponds and lakes, along streams
Elevation: 0–1500 m
Distribution
Ariz., N.Mex., Okla., Tex., Mexico (Coahuila), Mexico (Nuevo León), Mexico (and Tamaulipas)
Discussion
Selected References
None.
Lower Taxa
None.
... more about "Helenium microcephalum var. microcephalum"
introrse +
connate +
herbaceous +
scarious +
absent +
hirsute +
papillate +
paniculiform +
continuous +
decurrent +
pinnatifid;lobed;spatulate;ovate;spatulate;ovate;oblong;oblanceolate;linear;lanceolate;elliptic +
winged;ribbed;winged;ribbed +
1;15 +
stigmatic +
35;150 +
absent +
zygomorphic +
yellow +
monomorphic +
dimorphic +
hairy +
0.7mm;1.4mm +
staminate +
staminate +
narrowly elliptic;narrowly oblongelliptic serrate +
straight +
gland-dotted +
distinct +
proximal +
1;5 +
bisexual +
dispersed +
corymbiform +
singly +
singly +
indeterminate +
20;150 +
surrounding +
ovoid +
alternate +
cauline +
deltate +
2-carpellate +
inferior +
attached +
anatropous +
persistent +
falling +
hairy +
tough +
thick +
absent +
connate +
persistent +
distinct +
falling +
hairy +
unequal +
in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. +
1836 +
pistillate +
absent +
fertile +
epaleate +
pitted +
ovoid;hemispheric;ovoid;hemispheric;globose;conic +
fibrous +
absent +
non-aristate +
exalbuminous +
modifed +
alternate +
erect +
2-branched +
papillate +
Helenium microcephalum var. microcephalum +
Helenium microcephalum +
variety +
projecting +
shorter +
dilated +
equaling +
annual +