Plants mostly monoecious, rarely with bisexual flowers. Stem much branched, 100-250 cm, densely leafy in upper part, sparsely light green warty; internodes ca. 3 cm. Submerged leaves 4- or 5-whorled, pectinate, broadly ovate in outline, 3-3.5 × 1-2.5 cm; segments in 13-16 pairs, filiform, 1-1.5 cm. Inflorescence a terminal spike of 4-whorled flowers, 6-10 cm; bracts reniform or suborbicular, shorter than flowers, broader than long. Male flowers: bracteoles rhombic to elongate, margin entire; calyx broadly campanulate, 0.5-1 mm, 4-parted nearly to middle; petals 4(or 5), pale pink, elliptic, 1.5-2.5 mm; stamens 8, without androphore. Female flowers: bracteoles pectinate, lanceolate in outline; calyx tubiform, 0.7-1 mm, margin shortly lobed; petals absent or minute and caducous. Fruit 4-loculed, subcylindric, ca. 2 × 1.5 mm; mericarps abaxially rounded, smooth or sparsely verrucose along margins. Fl. and fr. Apr-Sep.
"Much like no. 9 [Myriophyllum sibiricum Kom.]; stem thickened below the infl to almost double its width farther down, curved to lie parallel with the water-surface, usually branching freely near the water-level; shoot-tip more tassel-like, with internodes mostly 1–3 cm; no turions; lvs with more numerous (mostly 12–20) long, straight segments per side; lower bracts often pectinate and often somewhat exceeding the frs; mericarps 2–3 mm; 2n=42. European sp., widely intr. in N. Amer., tolerant of nitrogenous pollution."
Submerged perennial. Stems thick, 30-150 cm long, branched, glabrous, rhizome rooting. Leaves 10-25 mm long, pectinate, with 20-26 segments. Spikes terminal, 50-70 mm long, with flowers in whorls of 4 in the axils of bracts; the upper flowers male, the lower female. Bracts 1.5-3 mm long, the upper obovate, entire; the lower: pinnatifid or with a deeply cleft margin. Male flower : sepals 0.5-1 mm long, triangular, obtuse; petals 2 mm long, oblong, cucullate, reddish. Stamens 8, filaments short; anthers 1-1.5 mm long. Female flower: calyx c. 1.5 mm long; petals minute. Ovary c. 1.5 mm long, subglobose; styles short, stigmas plumose. Fruit 2 mm long, subglobose.
Stamens (?2)8; anthers c. 2 mm. long; filaments c. 2 mm. long.
Fruit subglobose, c. 3 mm. in diameter, 4-sulcate, usually with 8 longitudinal verrucose ridges or rarely smooth.
Aquatic herb, usually submerged, occasionally creeping on to muddy banks; rhizome rooted; stems up to 2 m. long, usually branched.
Flowers unisexual or bisexual in terminal emergent spikes up to 10 cm. long; spikes interrupted with whorls c. 1·5 cm. apart along a 4-angled rhachis; whorls of 4 obovate entire bracts (except the lowest which are pinnatisect or dentate); upper bracts shorter than the flowers; bracteoles broadly ovate to triangular, entire.
Submerged leaves pinnatisect, in alternating whorls of (3)4(5), glabrous, ± equalling intemodes; leaf-segments 7–11 on each side, filiform, usually obtuse at apex; stipule-like outgrowths absent or inconspicuous.
Ähnlich wie M. verticillatum, aber untergetauchte Blattquirle meist mit nur 4 Blättern, Blüten meist zu 4 quirlständig, Tragblätter wenigstens im oberen Teil des Blütenstandes ungeteilt und kürzer als die Blüten.
Monoecious or polygamous, rhizomatous, submerged, aquatic perennial to 2 m. Leaves whorled, feathery pinnatisect, lobes filiform. Flowers in terminal, emergent spikes, yellow.
Aquatic herb, usually submerged, occasionally creeping on to muddy banks; rhizome rooted; stems up to 2 m long, usually branched. Submerged leaves pinnatisect, in alternating whorls of (3)4(5), glabrous, ± equalling internodes; leaf-segments 7-11 on each side, filiform, usually obtuse at apex; stipule-like outgrowths absent or inconspicuous. Flowers unisexual or bisexual in terminal emergent spikes up to 10 cm long; spikes interrupted with whorls c. 1.5 cm apart along a 4-angled rhachis; whorls of 4 obovate entire bracts (except the lowest which are pinnatisect or dentate); upper bracts shorter than the flowers; bracteoles broadly ovate to triangular, entire. Petals 4, c. 3 mm long. Stamens (?2)8; anthers c. 2 mm long; filaments c. 2 mm long. Stigmas 4, spreading, papillose. Fruit subglobose, c. 3 mm in diameter, 4-sulcate, usually with 8 longitudinal verrucose ridges or rarely smooth.
Submerged hydrophyte. Leaf segments finely divided, not glandular, apex not mucronulate, stipule-like outgrowths absent or inconspicuous. Flowers: in terminal emergent spikes, 50100 mm long; corolla cream-coloured; Mar.-May. Fruit a nut, ± 3 mm in diameter.
Still, shallow waters near banks of rivers, lakes and ponds.
Velddrif to Montagu, and throughout Africa and Europe.
Botswana, Malawi, Zambia, Zimbabwe. Almost ubiquitous in the northern hemisphere; frequent in northern and southern Africa but rare in the tropics (Cameroon, Ethiopia, Tanzania, Malaysia, Philippines).
|Millefoglio d'acqua comune||Italian||CH|
|Myriophylle en épi||French||CH|