Dicoma tomentosa Cass.

Species

Angiosperms > Asterales > Asteraceae > Dicoma

Characteristics

Erect often much-branched and bushy rather woody annual herb 5–70 cm tall; stems tinged purple or brown, white-tomentose, glabrescent.. Leaves narrowly to broadly lanceolate, 2–9.5 cm long, 0.2–1.1 cm wide, attenuate at the base, closely shortly apiculate-serrulate, obtuse, aristate-apiculate, discolorous, green and thinly finely tomentose above, white or grey with dense fine tomentum beneath.. Capitula discoid, solitary or few in the leaf axils, subsessile or shortly pedunculate; involucre obconic, becoming campanulate-cylindrical in fruit, 12–17.5 mm long, thinly tomentose, glabrescent; phyllaries ± 35–50, 4-seriate, becoming progressively longer inwards, with the outer spreading or recurving and the innermost erect, narrowly triangular-lanceolate or lanceolate, scarious except for thickened mid-rib, attenuate or acuminate-attenuate into a rather soft scabrid-ciliate spine, pale green then stramineous, often purple-tinged, the longest 11.5–15 mm long.. Florets 5–15, all hermaphrodite; corolla cream, pale yellow or pale mauve, 4–7 mm long, lobes 2.5–3.5 mm long, anthers long-exserted, styles purple.. Achenes turbinate, brown, strongly 10-ribbed, with dense long white ascending apically bifid hairs at the base and between the ribs, 2–3 mm long; pappus of numerous unequal outer strongly barbellate bristles and 10 inner lanceolate acute membranous scales, 4.7–7 mm long.. Fig. 4.
More
Corollas creamy-white, 5–6 mm. long, lobes linear erect straight or recurved at the apex; achenes c. 2.5 mm. long, somewhat compressed turbinate, with c. 10 pronounced ± wing-like ribs, somewhat glutinous, ± densely long hispid-setose between the ribs, the hairs ± equalling achene in length and obscuring the surface, the basal hairs shorter more numerous and ± spreading; pappus copious, dimorphic, the outer series of slender barbellate setae 5–6 mm. long, the inner of c. 10 more robust narrowly scale-like setae 5–6 mm. long and broadly scarious-winged, barbellate near the apex.
Leaves discolorous, subsessile or midrib petiole-like in the lower c. 10 mm., mostly 10–75 x 3–12 mm., linear-elliptic to oblanceolate, often conduplicate, subacute to rounded mucronate or cuspidate at the apex, narrowly cuneate or attenuate below, callose-serrulate on the margins, green and thinly araneose to ± glabrescent on the upper surface, greyish-lanate beneath.
Phyllaries numerous, rigid dry-coriaceous, straight not reflexed, puberulous particularly the outer, usually purple-tinged with a darker purple stripe on either side of the midrib, margins sharply serrulate-ciliolate, from c. 3 mm. long and subulate outside to c. 18 mm. long and very narrowly triangular inside, apex long acuminate finely pungent.
Annual herb, up to 0.6 m high. Leaves oblanceolate or lorate, sometimes conduplicate, greyish lanate below, tapering into pseudopetiole, margin minutely callous-serrate. Heads discoid, axillary. Pappus barbellate, 2-seriate, outer slender, inner undulate-winged towards base. Flowers yellowish or whitish.
A herb. It grows 60 cm tall. It usually grows each year from seed. It has a woody base. The stems have a cottony coating. The leaves are narrow. They are 12-16 cm long by 1-2 cm wide. The flowers are in spiny heads and are pale pink.
Capitula numerous, subsessile or on short shoots, 1–15 arranged along each branch, singly or less often paired, subtended by 1–4 leaves.
Involucres mostly 12–20 mm. long with phyllaries diverging to 15–20 mm. in diam., loosely obconic-campanulate.
An annual weedy herb, usually branched from a woody base, up to 2 ft. high, with cottony stems and leaves
Stems purplish, branched above, leafy, greyish-white lanate to glabrescent.
Greenish-white to pale pink florets in spinose heads 1/2 in. or more long
An erect annual herb, 16–65 cm. tall.
Life form annual
Growth form herb
Growth support free-standing
Foliage retention -
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 0.55 - 0.61
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months -
Fruit color -
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway c3

Environment

Low rainfall areas, on sandy or dry rocky river banks, rocky slopes, grassy floodplains, sand veld or Colophospermum mopane-grassland, at elevations below 800 metres. Also as a weed of old cultivation and disturbed areas.
More
It is a tropical plant. It grows in dry grasslands.
In dry fields.
Light -
Soil humidity -
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 9-12

Usage

Uses food material medicinal
Edible -
Therapeutic use Dental caries (root), Periodontitis (root), Toothache (root), Fever (unspecified), Parturition (unspecified), Sore (unspecified), Antipyretics (unspecified), Wounds and injuries (unspecified), Antipyretics (whole plant), Postnatal care (whole plant), Toothbrush (whole plant), Wounds and injuries (whole plant)
Human toxicity -
Animal toxicity -

Cultivation

Can be grown by seedlings.
Mode seedlings
Germination duration (days) -
Germination temperacture (C°) -
Germination luminosity -
Germination treatment -
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Images

Leaf

Dicoma tomentosa leaf picture by Sylvain Piry (cc-by-sa)

Flower

Dicoma tomentosa flower picture by Sylvain Piry (cc-by-sa)

Fruit

Dicoma tomentosa fruit picture by Sylvain Piry (cc-by-sa)

Distribution

Dicoma tomentosa world distribution map, present in Angola, Benin, Burkina Faso, Botswana, Cameroon, Egypt, Eritrea, Ethiopia, Kenya, Mali, Myanmar, Mozambique, Mauritania, Malawi, Namibia, Niger, Nigeria, Pakistan, Saudi Arabia, Sudan, Senegal, Somalia, South Sudan, Chad, Togo, Tanzania, United Republic of, Uganda, Yemen, South Africa, Zambia, and Zimbabwe

Identifiers

LSID urn:lsid:ipni.org:names:201373-1
WFO ID wfo-0000004304
COL ID 35QJP
BDTFX ID -
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Acilepis lanata Xeropappus lanuginosus Schaffnera carduoides Dicoma lanuginosa Onopordum lanatum Dicoma gnaphaloides Dicoma tomentosa