Argyreia maymyensis

Nomenclature

Accepted name/Authority/Place of publication:

Argyreia maymyensis (Lace) Raizada, Ind. Forester 94: 434. 1968.

Synonyms:

Ipomoea maymyensis Lace, Bull. Misc. Inform. Kew 1914. 380. 1914.

Lettsomia maymyensis (Lace) Kerr, Fl. Siam. 3(2): 33. 1954.

Description

Habit:

Herbaceous twiner; stems slender, axial parts setose.

Leaves:

Leaves ovate-lanceolate, 7–11.5 cm by 2.5–4.3 cm, base rounded or rarely cuneate, apex acute, chartaceous-membranous, often covered with whitish, subrigid pilose hairs with a swollen base; lateral veins 6–8 per side; petiole up to 2.5 cm long.

Inflorescences:

Inflorescences axillary, 1–3-flowered; peduncle 1.8–2.5 cm long; bracts linear, up to 2 cm long, covered in long, pale brownish hairs.

Flowers:

Flower sepals subequal, 25–28 mm long, c. 4 mm broad at the oblong base, from below midpoint narrowing abruptly into caudate-acuminate acumen c. 10–12 mm long, outside brownish hirsute with long spreading hairs, inside glabrous; corolla campanulate, whitish or pale yellowish, c. 4 cm long, glabrous outside, limb subentire; stamens included, filaments 10–12 mm long, bases pilose, anthers 5.5 mm long; pistil included, ovary glabrous, style filiform 23 mm long, glabrous.

Fruits:

Berry not seen.

Author:

Staples, G. & P. Traiperm.

References:

Staples, G. & P. Traiperm. 2010. Argyreia in Convolvulaceae. Fl. Thailand 10(3): 337–371.

Biogeography, Ecology and Natural History

Distribution Map:

Distribution:

Myanmar, Thailand.

Phenology:

Fruiting: December.

Author:

Staples, G. & P. Traiperm.

References:

Staples, G. & P. Traiperm. 2010. Argyreia in Convolvulaceae. Fl. Thailand 10(3): 337–371.

Other information

General comments:

Put 4489 was cited as A. maymyensis by Kerr (in Fl. Siam. Enum. 3(2): 33. 1954) and a sterile duplicate of that collection, seen in Paris, agrees well with the type from Myanmar. Argyreia maymyensis is provisionally maintained here as distinct. However, it is necessary to compare Argyreia maymyensis with another Burmese species with an older name: A. barbata (Wall.) Raizada. The few specimens are very similar in vegetative and floral morphology, but Wallich’s plate illustrating A. barbata shows the sepals obtuse or rounded, whereas A. maymyensis has sepals with a caudate-acuminate apex, the narrow tip almost as long as the broad basal part of the sepal. Type material for A. barbata has to be located and checked to verify that the Wallich plate is drawn accurately before any taxonomic rearrangements are made.