| Dicotyledon | Literature for Amaranthus dubius
Wagner et al., 1990, 1999. |
| Amaranthaceae -- The Amaranth, Goosefoot Family | Bibliography |
| Amaranthus dubius | |
Common name(s): amaranth, pigweed, spleen amaranth |
| General Information | ||
|---|---|---|
| Distribution | Native to the Paleotropics.In the Hawaiian Islands, naturalized on O`ahu. | |
| Habit |
Monoecious, erect annual herbs 4-9(-15) dm tall; stems usually branched, conspicuously striate, pubescent, especially above, the hairs multicellular. |
|
| Leaves |
Leaves ovate to rhombic ovate, blades 1.5-8(-12) cm long, 0.7-5(-8) cm wide, lower surface glabrous to sparsely pilose along the veins, petioles 0.6-5(-8.5) cm long. |
|
| Flowers |
Flowers green, in axillary clusters in the lower part of the plant, in unbranched or rarely branched spikes above, the lower clusters of flowers entirely pistillate, staminate flowers only in the upper 1 cm of the spikes, rarely scattered among pistillate ones, bracts and bracteoles deltate ovate, awn tipped; sepals (4)5, those of staminate flowers broadly lanceolate or lanceolate oblong, apex acuminate, only the midrib green, those of pistillate flowers oblong or spatulate oblong, apex obtuse or sometimes acute, mucronulate; stigmas 3. |
|
| Fruit |
Fruit ovoid, with a short inflated neck below base of style, 1.5-1.8 mm long, dehiscent with a circumscissile lid, the lid rugulose near the line of dehiscence. |
|
| Seeds |
Seeds black, shiny, compressed, 1-1.2 mm long, inconspicuously reticulate. |
|
| Chromosomes |
2n = 64. |
|
