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Dictyoneura obtusa

Family

Sapindaceae

Botanical Name

Dictyoneura obtusa Blume

Blume, C.L. von (1847) Rumphia 3: 165. Type: New Guinea, Lobo, 1828, Zippelius s.n.; holo: L; iso: K.

Synonyms

Dictyoneura microcarpa Radlk., Botanische Jahrbucher: 293(1921), Type: Westl. Neu-Guinea: Beim Dorfe Kabatiel (BRANDERHORST n. 202! fruchtend im Dez. 1907). Dictyoneura bamleri K.Schum. & Lauterb., Fl. Schutzgeb. Sudsee: 421(1900), Type: New Guinea, Sattelberg, 5-1-1899, Bamler 29; holo: B (lost); iso M.

Stem

Seldom exceeding 30 cm dbh.

Leaves

Leaflet stalk short. Leaflet blades about 2.7-10.5 x 1-3.5 cm. Midrib raised on the upper surface; marginal teeth few and sparse or absent. Domatia, if present, are tufts of hairs. Terminal buds clothed with brown or golden hairs. Younger leafy twigs longitudinally grooved. Compound leaf rhachis with a median ridge and two grooves on the upper surface.

Flowers

Male and female flowers produced in the same inflorescence. Male flowers: Flowers about 4 mm diam. Perianth about 2.5 mm long. Stamens five, anthers +/- reniform, wider than long, filaments about 2 mm long, clothed in long white hairs. Disk swollen, hairy. Female flowers: Flowers about 4 mm diam. Perianth about 2.5 mm long, mainly glabrous, margins ciliate. Staminodes resemble stamens, filaments about 1-5 mm long, hairy. Disk swollen, hairy. Ovary hairy.

Fruit

Fruit orange-yellow, about 7-10 mm long. Calyx persistent at the base. Seeds about 7 x 5 mm. Testa shiny. Aril covering the seed from the base to about 1/2 to 3/4 of the total length of the seed usually with a slit or sinus on one side. Embryo about 7 x 5 mm, cotyledons thick and fleshy, radicle about 1 mm long.

Seedlings

First pair of leaves compound with 4-6 leaflets, leaflet margins serrate, rhachis winged, petiole less so. At the tenth leaf stage: leaflet blades ovate-elliptic, unequal-sided at the base, midrib raised on the upper surface, teeth +/- confined to the apical half of the leaflet blade, glabrous; rhachis narrowly winged, the petiole less so; terminal bud clothed in dark brown hairs.

Distribution and Ecology

Occurs in CYP and NEQ. Altitudinal range from sea level to 100 m. Grows in gallery forest. Also occurs in New Guinea.

CYP

X

NEQ

X

Tree

X

RFK Code

723