Argyreia ionantha

Nomenclature

Accepted name/Authority/Place of publication: 

Argyreia ionantha (Kerr) Khunwasi & Traiperm, Thai Forest Bull. (Bot.) 33: 42. 2005.

Synonyms: 

Lettsomia ionantha Kerr, Bull. Misc. Inform. Kew 1941: 15. 1941. TYPE.  Thailand. Chiang Mai, Doi Phra Kao, Garrett 738 (isotypes BKF, L, P). 

Description

Habit: 
Woody twiner, densely brown-fulvous tomentose; stems terete, glabrescent.
Leaves: 
Leaves cordate or broadly ovate, 9.0–13.5 by 8.5–14.0 cm, subchartaceous, base broadly cordate, apex shortly and acutely acuminate, upper side appressed hirsute with bulbous-based hairs, underside softly appressed pubescent; lateral veins 7–9 per side; petiole 4–10 cm long.
Inflorescences: 
Inflorescences axillary, capitate-cymose, 3–6-flowered; peduncles 8–16 cm long; bracts oblong-lanceolate, 1.5–2.7 cm long, persistent; pedicels 0–4 mm long.
Flowers: 
Flower sepals unequal, entire, ovate, outer 8–12 by c. 4.5 mm, hirsute outside, glabrous inside, acute to acuminate, inner 7–9 by c. 3 mm, acuminate, less hirsute; corolla campanulate, 4.5–5.0 cm long, whitish purple to pale purple outside, throat reddish pink, limb shallowly lobed, midpetaline bands long hirsute outside, inside glabrous; stamens included, filaments 15–20 mm, bases hairy; pistil included, disk cupular, shallowly 5-lobed; ovary 2-celled, glabrous, style c. 30 mm.
Fruits: 
Berry 5–6 mm diam., dark red.
Seeds: 
Seeds c. 4 mm long, dark brown, glabrous.
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: 

Thailand. Endemic. 

Ecology: 

Often in partly
shaded situations in primary evergreen hill forest, mixed evergreen and pine
forest, secondary regrowth, and bamboo-rich disturbed evergreen forest; on clay
soils over granite bedrock; altitude: 800–1685 m. 

Phenology: 

Flowering: September, October; fruiting: January, February, November, 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: 

It is entirely possible that Agyreia ionantha is conspecific with A. mastersii (Prain) Raizada, from NE India and Myanmar. The descriptions certainly sound similar. A careful comparison of material from across the region, including Prain’s types of the latter species, conserved at Calcutta, is necessary for settling the taxonomic concept to be followed. 

Authorship for webpage

Editor: 
George Staples, Esmond Er
Contributors: 
Classification: 
Argyreia ionantha
Mon, 2011-09-26 02:06 -- Esmond
http://www.gravatar.com/avatar/23fae7ceaa50619ce7ef9c7d4922f7b2.jpg?d=https%3A//convolvulaceae.myspecies.info/sites/all/modules/contrib/gravatar/avatar.png&s=100&r=G

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