Flora of the Hawaiian Islands
Dicotyledon Literature for Cardiospermum halicacabum
Wagner et al., 1990, 1999; Lorence & Wagner, 2020.
   Sapindaceae -- The Soapberry Family Bibliography
      Cardiospermum halicacabum

Common name(s): balloon vine, heartseed, `inalua, haleakai`a (Ni`ihau), pohuehue uka, poniu
General Information
DistributionWidespread in tropical and subtropical parts of the world, but probably native only to the southern United States and Neotropics.In the Hawaiian Islands, naturalized on Ni`ihau, Kaua`i, O`ahu, Moloka`i, Maui, Hawai`i.

Annual or perennial vine; stems ribbed, many branched, sparsely pilose to glabrate.
Leaves usually biternate; leaflets narrowly to broadly lanceolate or rhombic-lanceolate, 1.5‒6 cm long, terminal one of each primary leaf division larger than those of lateral pair, short-hirsute, primarily along the veins, margins, and petiolules, margin coarsely and irregularly lobed.
Inflorescences on peduncle 3.5‒12 cm long. Flowers with outer sepals obovate, ca. 1‒1.5 mm long, inner pair suborbicular, 1.5‒3 mm long, ciliate; corolla white, obovate, ca. 2‒3 mm long, 1 pair with small crests.
Fruit globose to obovoid, membranous, strongly inflated, 3-angled, 2‒3.5 cm long, short-hirsute.
Seeds black, globose, 3.5‒5 mm in diameter, heart-shaped aril conspicuous.
2n = 22.
Nancy Khan