Argyreia sumbawana

Nomenclature

Accepted name/Authority/Place of publication:

ArgyreiasumbawanaOoststr., Blumea 5 (1943) 362.

Synonyms:

Rivea sumbawana Hallier f. in Elbert, Sunda-Exp. 2 (1912) 281, nom.nud.

Description

Habit:

Stems twining, young parts densely appressed-pubescent to farinose, pale fulvous, adult parts farinose to glabrous.

Leaves:

Leaves ovate, 6- 13 by 3-8½ cm; base slightly emarginate to truncate or shortly attenuate into the petiole, apex shortly acuminate, acute, and mucronulate; upper surface densely appressed-sericeous, lower surface densely and shortly sericeo-tomentose, pale fulvous; midrib and 9- 14 lateral nerves on either side prominent beneath, slightly impressed above; petiole 2½-6 cm, densely and shortly pilose.

Inflorescences:

Peduncle slender, exceeding the petiole, 3-11 cm, umbellately cymose at the apex, densely pubescent to farinose as are its branches and the pedicels. Pedicels 4-8 mm. Bracts minute, ovate-lanceolate, acute, densely pubescent outside, subglabrous inside, caduceus.

Flowers:

Sepals equal or the inner ones slightly shorter, outside densely pubescent, inside sparsely so to glabrous, two outer ones ovate-triangular, ovate-oblong, or oblong, obtuse, 5½-6½ mm long; sepal 3 narrowly elliptic to oblong, slightly oblique, 5½-6½ mm long; two inner sepals ovate to ovate-triangular, attenuate towards the obtuse apex, 5-6 mm long. Corolla tubular to funnel-shaped, ca 2½ cm long, pink to pale reddish purple; limb shallowly lobed, soon refiexed; midpetaline bands and upper portion of tube sericeous. Stamens and style exserted. Filaments densely pilose at the base. Ovary glabrous, 4-celled.

Fruits:

Fruit unknown.

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:

Lesser Sunda Islands (Sumbawa).

Ecology:

The species has been collected in
dry thickets at 50 m and in open places at 500 m.

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

General comments:

The shape of the sepals appearsto be rather variable. In the type specimen they are ovate-triangular toovate-oblong, in other collectionsthey are narrower.