Flora of the Hawaiian Islands
Dicotyledon Literature for Alternanthera sessilis
Wagner et al., 1990, 1999; Lorence & Wagner, 2020.
   Amaranthaceae -- The Amaranth, Goosefoot Family Bibliography
      Alternanthera sessilis

Common name(s): chaff flower, sessile joyweed
General Information
DistributionWidespread in tropical and subtropical areas.In the Hawaiian Islands, naturalized on Kaua`i, O`ahu, Moloka`i, Lana`i, Maui, Hawai`i.

Amaranthaceae - Alternanthera sessilis Amaranthaceae - Alternanthera sessilis

Perennial herb; stems prostrate, rarely ascending, often rooting at the nodes, 10‒100 cm long, villous in lines and transversely at the nodes.
Leaves short-petiolate; blade obovate to broadly elliptic, occasionally linear-lanceolate, 1‒15 cm long, 0.3‒3 cm wide, glabrous to sparsely villous; petiole 1‒5 mm long.
Inflorescences a sessile spike, bract and bracteoles shiny white, 0.7‒1.5 mm long, glabrous. Flowers with sepals equal, 2.5‒3 mm long, outer ones 1-nerved or indistinctly 3-nerved toward base; stamens 5, 2 sterile.
Fruit a utricle 2‒2.3 mm long, exceeding the sepals.
2n = 34, 36, 40, 96.
Nancy Khan