Plants photographed on Kyffhäuser
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Amaranthus dinteri Schinz

Amaranthus dinteri

Leaves and clustered flowers

Family: Amaranthaceae
Full name: Amaranthus dinteri Schinz
Location: Kyffhäuser (2416AD + 2416CB)
ID status: Fairly certain
Afrikaans common name(s): -
English common name(s): Pigweed
Synonym(s): Amaranthus dinteri Schinz subsp. dinteri
Status: Native
Description: Annual herb; main stems decumbent, sometimes erect, 10-40 cm, branched especially at their base, subglabrous or with short straight or papiliform hairs when young. Leaves with 5-20 mm petiole, glabrous or barely pubescent, obovate or obovate-elliptic blade, wavy, 5-25(-30) X 3-14 mm, attenuate at the base, obtuse at the apex, rounded or retusa, often with a mucron of 0.1-0.5 mm. Axillary inflorescences, in greenish glomeruli, 5-8 mm in diameter, which approach and converge towards the apex of the stems; bracts and bracteoles lanceolate, 1-2.5 mm, shorter than the sepals, membranous, with the midvein green and excurrent, curved and reflected at the apex. Flowers of both sexes on the same inflorescence. Staminate flowers with 3 sepals lanceolate to elliptic, 1-2.2 mm, shortly acuminate, 3 stamens. Pistillate flowers with 3 ovate to oblong sepals, 1.5-3.5 mm, unequal, with a whitish area and a green midvein, unbranched, sometimes conspicuously reflexed, usually acute at the apex with an apicle 0.1-0.5(- 0.75)mm; stigmas 3, straight or slightly reflexed, 0.5-0.75 mm. Dehiscent fruits, with a rough operculum, smooth urn, shorter or almost equal to the sepals; seeds blackish or brown, 1.1-1.4 mm diam, shiny in the central area, semi-shiny and finely reticulated in the marginal area. (from REVISIÓN TAXONÓMICA DE LAS ESPECIES MONOICAS DE AMARANTHUS, ND Bayon, Annals of the Missouri Botanical Garden, Vol. 101, No. 2 (December 2015), pp. 261-383)

Stems glabrous (sometimes puberulous above especially about the nodes), without elongate crisped hairs, frequently papillose-scabrid; female perianth-segments with a short, 0.1–0.5 (0.75) erect or divergent mucro. (from Kew eFloras website / Flora Zambesiaca)

Annual herb, decumbent or ascending with numerous stems from the base (the stems rather sparingly branched below), or erect and branched, chiefly in the lower half, glabrous or sometimes puberulous when young, mainly about the nodes; stem and branches more or less sulcate and angled, almost smooth to considerably papillose-scabrid. Main leaves of stem and branches glabrous, c. 10–45 x 3–13 (18) mm including the slender petiole, which varies from slightly shorter to considerably longer than the broadly obovate or less commonly elliptic lamina, rounded-obtuse to slightly emarginate, shortly and feebly mucronate, with or without a purplish black blotch. Flowers green, in dense axillary clusters 4–8 mm in diam., extending almost to the base of the plant, clusters becoming more approximate above but the superior leaves only gradually and never considerably reduced; male and female flowers intermixed, the males more numerous above. Bracts lanceolate, 1–1.5 mm long, pale membranous, the arista somewhat shorter than the lamina; bracteoles c. 1.25–3 mm long, lanceolate-ovate to lanceolate, green along the midrib above, usually more shortly aristate than the bracts, outwardly-curving, shorter than the perianth. Male flowers with 3 elliptic, shortly aristate tepals, c. 1.5–2 mm long, pale-membranous with a greenish or brownish midrib. Female flowers with 3 tepals, tepals ovate to oblong, (1.5) 2–3 mm long, frequently broadly greenish above with branched or anastomosing nervation towards the usually more or less outwardly curved apices, acute to somewhat obtuse, shortly but distinctly aristate. Stigmas 3, c. 0.5–0.75 mm long, somewhat expanded below. Fruit ovoid to shortly obpyriform, shorter than or sometimes subequalling the perianth, circumcissile, strongly rugose, dark when ripe. Seeds compressed, lenticular, 1–1.5 mm across, finely reticulate over the entire surface, less shining than in many species of the genus. (from JSTOR Global Plants website / Flora Zambesiaca)

Partial inflorescences all axillary. The perianth of the female flowers is longer than the preceding leaves, without awn, at most with 0.2-0.8 now long prickly tips. Female flowers with 3 ovate-lanceolate, sharply pointed hull leaves with a 0.3-0.8 mm long spike tip. Pre-leaves only a little shorter than the floral envelope. Leaves inverted egg-shaped-spatulate to almost rounded, suddenly narrowed into the petiole. (from Prodromus einer Flora of SWA)
Link(s) African Plant Database
JSTOR Plant Science
Kew Herbarium Catalogue
BGBM Berlin-Dahlem - Virtual Herbarium
Züricher Herbarien
iNaturalist (Namibia / Alex Dreyer)
iNaturalist (Namibia)
iNaturalist (southern Africa)
Flora of Zimbabwe
Fleurs de notre Terre - Galerie Namibie
Tree Atlas of Namibia
Photographer: AA Dreyer
Date of photograph: 20 Dec 2008
Camera make: Canon
Camera model: PowerShot A700
Lens aperture: f/4.0
Shutter speed: 1/200 s
ISO speed: -
Content last updated: 18 Apr 2024

Note: The identification of some of the plants on this website is not 100% certain. Any comments will be highly appreciated. I would also be willing to supply higher resolution images upon request. Please contact me at the e-mail address given below.

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Last updated 18 Apr 2024

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