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Hemigraphis royenii

Family

Acanthaceae

Botanical Name

Hemigraphis royenii Bremek.

Bremekamp, C.E.B. (1957) Nova Guinea 8: 132. Type: van Royen 4770, between Wam River and Lake Wam, alt. 60 m, Merauke District.

Stem

Decumbent herb. Stems ca. prostrate, rooting at the nodes, 4-angled and grooved, hairy.

Leaves

Petioles 5-15 mm long, hairy.Leaf blade elliptic, 5.5-10 x 2-3.5 cm; attenuate at base; acuminate to acute at apex; lateral veins 5-7 on each side of the midrib and forming loops inside the blade; glabrous with numerous embedded cigar-shaped glands visible on the upper surface of the leaf blade, glands visible with a lens.Margin shallowly crenate.

Flowers

Inflorescence a terminal spike. Bracts leaf-like with short hars. Calyx lobes linear, 7-8 x 0.8-0.9 mm, with short hairs. Corolla white, veined purple, 13-15 mm long, tube and throat 10-11 mm long. Stamens with upper filaments1.5-1.8 mm long, hairy, lower filaments 0.8-0.9 mm long with short hairs. Ovary hairy in upper half, 4 ovules per cell. Seeds 1-4 per capsule, with seed-bearing hooks. Seed clothed in hairs, orbicular, flattened, ca.1.5-2 mm diam.

Fruit

Fruit a cigar-shaped capsule, 8-9 x 2.5 mm, hairy in upper half, enclosed in the persistent calyx.

Seedlings

Cotyledons orbicular, radicle straight, about 0.5 mm long.

Distribution and Ecology

A native species from the Iron Range area of Cape York Peninsula. Grows in undergrowth of gallery rainforest also in semi evergreen and notophyll vine forest on alluvial soil.

CYP

X

Herb (herbaceous or woody, under 1 m tall)

X

RFK Code

4131