Argyreia osyrensis

Nomenclature

Accepted name/Authority/Place of publication: 

Argyreia osyrensis (Roth) Choisy in A. de Candolle, Prodr. 9: 334. 1845.

Synonyms: 

Ipomoea osyrensis Roth, Nov. Pl. Sp. 117. 1821

Argyreia aggregata (Roxb.) Choisy, Mém. Soc. Phys. Genève 6: 427. 1834. 

Lettsomia aggregata Roxb., Fl. Ind. 2: 76. 1824. 


Lettsomia aggregata Roxb. var. osyrensis C.B.Clarke in Hook.f., Fl. Brit. Ind. 4: 192. 1883. 


Argyreia aggregata var. osyrensis (C.B.Clarke) Gagnep. & Courchet in Lecomte, Fl. Indo-Chine 4: 280. 1915. 

Argyreia brachypoda (Kerr) Ooststr., Blumea 7: 178. 1952. 

Lettsomia brachypoda Kerr, Bull. Misc. Inform. Kew 1941: 13. 1941.

Argyreia osyrensis var. cinerea Hand.-Mazz., Oesterr. Bot. Z. 87: 124. 1938. 

Description

Habit: 
Shrubs, scandent. Stems terete; axial parts densely whitish, gray, or yellowish tomentose.
Leaves: 
Petiole 2–5 cm; leaf blade ovate or broadly ovate to nearly circular, 4–12 × 4–10 cm, abaxial surface densely gray tomentose, woolly or villous, adaxial surface ± strigose-villous or glabrescent, base cordate, apex acute or obtuse; lateral veins 7–11 pairs.
Inflorescences: 
Cymes capitate; peduncle 2.5–6 cm; bracts ± persistent, broadly obovate, spatulate, or circular, 8–12 mm, tomentose abaxially, apex obtuse or truncate.
Flowers: 
Flowers sessile or nearly sessile. Sepals unequal, tomentose abaxially; outer 2 sepals obovate or spatulate, 9–10 mm, apex obtuse; inner sepals oblong, 5.5–8 mm, apex obtuse, glabrous adaxially, apex obtuse. Fruiting sepals enlarged, red, concave. Corolla pink, tubular-campanulate, 1.2–1.5 cm; limb deeply 5-lobed; lobes narrowly ovate, emarginate, midpetaline bands pubescent. Stamens and pistil exserted; filaments pubescent basally. Ovary glabrous, 2-loculed.
Fruits: 
Berry enclosed by calyx, red, globose, 6–8 mm in diam.
Seeds: 
Seeds 1 or 2, ± globose, nearly glabrous.
Author: 
Fang R.C. & G. Staples
References: 

Fang R.C., G. Staples, et al. 1995. Convolvulaceae in P. Raven & C.Y. Wu (eds.) Flora of China 16: 271–325.  

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

Biogeography, Ecology and Natural History

Distribution Map: 
Distribution: 

China (SW Guangxi, Hainan, S Yunnan), ?Bangladesh, ?Cambodia, India, Indonesia, Laos, ?Malaysia, Myanmar, Sri Lanka, Thailand, Vietnam.

Ecology: 

Open
forests, thickets; near sea level to 1600 m. Often in dry habitats
in dipterocarp forest and scrub, secondary regrowth, hill evergreen forest, on
sandy, silt, muddy clay, silica, and granite soils; altitude: 200–1400 m. 

Phenology: 

Flowering: January, February, August, September, October, November, December; fruiting: February, December.

Author: 
Fang R.C. & G. Staples
References: 

Fang R.C., G. Staples, et al. 1995. Convolvulaceae in P. Raven & C.Y. Wu (eds.) Flora of China 16: 271–325.  

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

Other information

Common names and uses: 
ju hua bai he teng, hui mao bai he teng (Chinese). The roots and leaves are used medicinally. Hun, thao ma kwang, kamlang mu thuean, bi la bat (Thai).
Infraspecific Characters: 

Chinese floras recognize two weakly separable varieties based on indumentum density; there is considerable intergradation between them and they hardly seem worthy of taxonomic recognition.

Specimens of the typical variety, described from the Deccan region in India, have adaxially glabrous leaves. Specimens from east Asia, including China, have a uniform, sparse distribution of hairs on the adaxial surface.

Authorship for webpage

Editor: 
George Staples, Esmond Er
Contributors: 
Classification: 
Thu, 2011-09-22 07:48 -- Esmond
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