Australian Tropical Rainforest Plants - Online edition
Hypserpa decumbens (R.Br. ex Benth.) Diels
Diels, F.L.E. (1910) Das Pflanzenreich Heft 46: 212.
Hyperpa; Hairy Hypserpa
Vine stem diameters to 14 cm recorded. Concentric growth rings visible in stem transverse sections.
Male flowers: Flowers borne in short dense racemes. Sepals four or five, ovate, about 1-2 mm long, outer surface clothed in hairs. Petals five or six, arranged in two whorls. Petals obovate or spathulate, about 2-3.5 x 1 mm. Stamens 12-15, each about 2-3 mm long. Anthers globose or wider than long. Female flowers: Flowers borne in short racemes. Sepals two to four, triangular, about 1-2 mm long. Petals six to eight, outer petals oblong, about 2-2.5 mm long, inner petals obovate or spathulate, about 1.5 mm long. Ovaries three. Ovules one per ovary.
Fruits +/- globose, sometimes paired, about 6-7 mm diam. Seeds about 5 x 3.5 mm. Embryo circular or U-shaped, about 11-12 mm in total length. Cotyledons up to 6 mm long. Radicle about 3-6 mm long. Radicle and cotyledons of similar widths.
Cotyledons linear, about 10-15 x 1 mm, no midrib or other venation visible. First pair of leaves ovate, apex apiculate, base rounded. At the tenth leaf stage: leaf blade cordate, about 8 x 5 cm, apex apiculate, base cordate, midrib slightly raised on the upper surface. Seed germination time 81 days.