Amaranthus muricatus

(Moquin-Tandon) Hieronymus

Pl. Diaph. Fl. Argent., 227. 1882.

Common names: Muricate amaranth “African amaranth”
Introduced
Basionym: Euxolus muricatus Moquin-Tandon in A. P. de Candolle and A. L. P. P. de Candolle, Prodr. 13(2): 276. 1849
Treatment appears in FNA Volume 4. Treatment on page 431. Mentioned on page 414, 430.

Plants annual or short-lived perennial, glabrous or slightly pubescent near tips. Stems ascending or prostrate, much-branched from stout rootstock, 0.1–0.4 m. Leaves: petiole to 1/2 as long as blade; blade linear to narrowly lanceolate, 1.5–8 × 0.2–0.5 (–1) mm, base tapering, margins entire, plane to undulate, apex obtuse and often emarginate. Inflorescences terminal, compact pyramidal panicles and axillary glomerules, erect or reflexed, green, leafless at least distally. Bracts of pistillate flowers linear, 0.7–1.2 mm, 1/2–2/3 as long as tepals. Pistillate flowers: tepals 5, narrowly oblanceolate, not clawed, equal, 1.5–2 mm, apex obtuse or subacute; style-branches erect; stigmas 3. Staminate flowers intermixed with pistillate or at tips of inflorescences; tepals 5; stamens 5. Utricles compressed, subglobose, 1.7–2 mm, ± equaling or slightly exceeding tepals, muricate, indehiscent. Seeds black, lenticular, 1–1.2 mm diam., semiglossy.


Phenology: Flowering summer–fall.
Habitat: Waste places, on ballast
Elevation: 0 m

Distribution

Introduced; Ala., s South America (Argentina), s South America (Paraguay), s South America (Uruguay), in s Europe, s Africa, Australia, and other regions

Discussion

The vernacular name “African amaranth” is sometimes used for this species; it is a misnomer; the species is native to South America and naturalized in Africa.

Selected References

None.

Lower Taxa

None.
... more about "Amaranthus muricatus"
Sergei L. Mosyakin +  and Kenneth R. Robertson +
(Moquin-Tandon) Hieronymus +
reflexed +  and erect +
tapering +
Euxolus muricatus +
0.05 cm0.5 mm <br />5.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.8 cm8 mm <br />0.008 m <br />) +
linear +  and narrowly lanceolate +
0.2mm;0.5mm +
persistent +
1/2 (?) +  and 2/3 (?) +
triangular +, deltate +, subulate +, linear +, lanceolate +  and ovate +
Muricate amaranth +  and “African amaranth” +
Ala. +, s South America (Argentina) +, s South America (Paraguay) +, s South America (Uruguay) +, in s Europe +, s Africa +, Australia +  and and other regions +
peripheral +
staminate +  and pistillate +
hypogynous +
minute +  and small +
not +  and dehiscent +
Waste places, on ballast +
reduced +
plane +  and undulate +
scarious +  and membranaceous +
reflexed +  and erect +
pyramidal +
0 +  and 1/2 +
Flowering summer–fall. +
rudimentary +
Pl. Diaph. Fl. Argent., +
0.1 cm1 mm <br />0.001 m <br /> (0.12 cm1.2 mm <br />0.0012 m <br />) +
lenticular +
Introduced +
much-branched +
prostrate +  and decumbent +
prostrate +  and ascending +
10 cm100 mm <br />0.1 m <br /> (40 cm400 mm <br />0.4 m <br />) +
not fleshy +
slender +
0.01 cm0.1 mm <br />1.0e-4 m <br /> (0.1 cm1 mm <br />0.001 m <br />) +
Acanthochiton +, Acnida +, Albersia +, Amblogyna +, Euxolus +, Mengea +, Sarratia +  and Scleropus +
Amaranthus muricatus +
Amaranthus subg. Albersia +
species +
distinct +
not clawed +  and oblanceolate +
subequal +
0.15 cm1.5 mm <br />0.0015 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
indurate +, membranaceous +, chartaceous +  and scarious +
walled +  and 3(-5)-veined +
subglobose +  and compressed +
0.17 cm1.7 mm <br />0.0017 m <br /> (0.2 cm2 mm <br />0.002 m <br />) +
membranaceous +
slightly exceeding tepals +  and equaling +
perennial +, short-lived +  and annual +
pubescent +  and glabrous +