Heterotheca sessiliflora (Nutt.) Shinners

Sessileflower false goldenaster (en)

Species

Angiosperms > Asterales > Asteraceae > Heterotheca

Characteristics

Perennials, (10–)20–70(–110) cm; taprooted. Stems 1–40+, decumbent to ascending or erect (sometimes ± brittle, sometimes reddish brown), moderately to densely hispido-strigose (long-spreading hairs often broken off), sometimes moderately hairy and densely stipitate-glandular distally (axillary leaf fascicles sometimes present). Leaves: margins flat to strongly undulate; basal and proximal usually withering by flowering; proximal cauline subsessile, blades oblanceolate, (8–)15–40(–60) × (2.4–)4–8(–11) mm, bases cuneate, margins entire, strigoso-ciliate (proximal hairs longer, spreading), apices acute, faces moderately to densely hispido-strigose; distal sessile, blades usually narrowly to broadly lanceolate, sometimes oblanceolate, 6.5–40 × 1.5–8 mm, usually reduced distally, bases rounded, faces sparsely to densely hispido-strigose or short-strigose (5–245 hairs/mm 2 ), sparsely to densely glandular (0–50 glands/mm 2 ). Heads (1–)17–36(–126) in corymbiform or paniculiform arrays, branches ascending. Peduncles 2–100 mm, densely hispid, strigose, or glandular; bracts 2–5+, proximal lanceolate, leaflike, distal reduced, phyllary-like, (2–)2.5–8.5(–13) × (0.3–)0.5–1.8(–4) mm, sometimes a few, large, leafy bracts proximal to heads. Involucres cylindric, turbinate, or campanulate (campanulate upon drying), (6–)7.5–11(–15) mm. Phyllaries in 4–6 series, mid narrowly triangular, unequal (outer lengths 1 / 5 – 1 / 4 inner), margins hyaline, fimbriate-ciliate apically, faces very sparsely to moderately strigose, very sparsely to moderately stipitate-glandular. Ray florets (4–)7–15(–24); laminae (3.5–)4.5–10.5(–18.5) × (0.7–)1–1.7(–2.4) mm. Disc florets (9–)20–50(–81); corollas ± ampliate, (4–)5.5–7(–9.5) mm, glabrous to glabrate, lobes 0.4–1 mm, sparsely pilose (hairs 0.1–1 mm, osteolate-celled ones often fragile). Cypselae monomorphic, obconic, compressed, (1.3–)2–3(–4.5) mm, ribs 6–10, faces sparsely to moderately strigose; pappi off-white, outer of linear scales 0.25–0.5 mm, inner of 25–45 bristles 5–8(–10) mm, longest attenuate to weakly clavate. 2n = 18, 36.
Life form perennial
Growth form herb
Growth support free-standing
Foliage retention -
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.2 - 0.7
Root system tap-root
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months
JanFebMar
AprMayJun
JulAugSep
OctNovDec
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

Light 7-9
Soil humidity 1-5
Soil texture 3-6
Soil acidity -
Soil nutriment -
Hardiness (USDA) -

Usage

Uses -
Edible -
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Mode -
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Heterotheca sessiliflora unspecified picture

Distribution

Heterotheca sessiliflora world distribution map, present in Mexico and United States of America

Identifiers

LSID urn:lsid:ipni.org:names:121476-2
WFO ID wfo-0000044560
COL ID 6M5LH
BDTFX ID -
INPN ID -
Wikipedia (EN) Link
Wikipedia (FR)

Synonyms

Heterotheca sessiliflora Chrysopsis sessiliflora var. sessiliflora Heterotheca sessiliflora var. sessiliflora

Lower taxons

Heterotheca sessiliflora subsp. fastigiata Heterotheca sessiliflora subsp. bolanderi Heterotheca sessiliflora var. thiniicola Heterotheca sessiliflora subsp. echioides Heterotheca sessiliflora subsp. sessiliflora