Argyreia barnesii

Nomenclature

Accepted name/Authority/Place of publication:

Argyreiabarnesii(Merr.) Ooststr., Blumea 6 (1950) 343.

Synonyms:

Rivea barnesii Merr., Bur. GovtLab. Publ. 17 (1904) 40.

Description

Habit:

Stems twining, terete, young parts densely pubescent to tomentose, adult parts glabrescent.

Leaves:

Leaves ovate-oblong, ovate or broadly ovate, 6-18 by 3½-13 cm, rounded or cordate at the base, shortly to long-acuminate or caudate and mucronulate at the apex, more or less densely and softly pilose to tomentose on both sides, sometimes nearly glabrous above; nerves 7-9(-12) on either side of the midrib; petiole 2-5 cm, densely pubescent.

Inflorescences:

Peduncles axillary, 2- 14 cm long, one to many-flowered, pubescent like the stem. Pedicels much shorter than or nearly as long as the sepals, elongated in fruit. Bracts lanceolate, acuminate, lower ones ca 1-2 cm long, pubescent on both sides.

Flowers:

Sepals nearly equal in length, 7-8 mm long; two outer ones ovate to broadly elliptic, obtuse or mucronulate, pubescent to tomentose outside; sepal 3 broadly elliptic to orbicular, obtuse or truncate, with one glabrous margin; two inner sepals orbicular, emarginate, with two glabrous margins. Corolla 5-parted, lavender; lobes linear, ca 20 by 3-4 mm, densely sericeous outside towards the base, at the apex with 2 triangular glabrous lobules; tube ca 9 mm long, glabrous. Filaments with a tooth above the base, glabrous. Ovary glabrous, 2-celled.

Fruits:

Fruit ellipsoid, up to 1½(-2) cm long, purple, at the base enclosed by the slightly enlarged sepals.

Seeds:

seed 1, ellipsoid, 1 cm long.

Author:

Ooststroom,S.J. van & R.D. Hoogland.

References:

Ooststroom,S.J. van & R.D. Hoogland. 1953. Convolvulaceae In Flora Malesiana 4:388–512.

Biogeography, Ecology and Natural History

Distribution:

Philippines (Luzon, Mindoro, GuimarasIsl., Samar, Leyte, Mindanao).

Ecology:

In forests at low and medium
altitudes forming tangled masses over the tops of trees and larger shrubs.

Author:

Ooststroom,S.J. van & R.D. Hoogland.

References:

Ooststroom,S.J. van & R.D. Hoogland. 1953. Convolvulaceae In Flora Malesiana 4:388–512.

Other information

Common names and uses:

The stems are used for tying purposes. Quahal, guahal, Ig .

General comments:

The density of the indumentum isextremely variable in this species; the leaves are densely tomentose on bothsurfaces or much less pilose to glabrous above and sparsely pilose beneath; thesame is found in the density of the indumentum on stems and inflorescences.