Merremia hederacea

Nomenclature

Accepted name/Authority/Place of publication: 

Merremia hederacea (Burm. f.) Hallier f., Bot. Jahrb. Syst. 18: 118. 1894.

Synonyms: 

Evolvulus hederaceus Burm. f., Fl. Ind. 77. plate 30, fig. 2. 1768. TYPE. Indonesia. Java, D. Pryon s.n. (G-Burman).

Convolvulus acetosellifolius Desr.

Convolvulus  chryseides (Ker Gawler) Spreng.

Convolvulus  dentatus Vahl

Convolvulus  flavus Willd.

Convolvulus  lapathifolius Spreng.

Ipomoea acetosellifolia (Desr.) Choisy

Ipomoea  subtriflora Zoll. & Moritzi

Lepistemon glaber Handel-Mazzetti

Lepistemon  muricatum Spanoghe

Merremia chryseides (Ker Gawler) Hallier f., Bot. Jahrb. Syst. 16: 552. 1893.

Merremia convolvulacea Dennst. ex Hallier f., Schlüss. Hort. Malab. 12, 23, 34. 1818.

Ipomoea chryseides Ker Gawler, Bot. Reg. t. 270. 1818.

Description

Habit: 
Herbs, twining or prostrate; axial parts often minutely tuberculate. Stems glabrous or sparsely hirsute, rooting at nodes.
Leaves: 
Petiole 5–50 mm, glabrous or pubescent; leaf blade cordate-ovate, 1.5–7.5 × 1–5 cm, nearly glabrous to sparsely puberulous, base cordate or broadly cordate, margin entire, irregularly crenate, or 3-lobed.
Inflorescences: 
Inflorescences (1–) few to many flowered, umbelliform, cymose in fruit; peduncle (3–)8–50 mm, thicker than petiole; bracts early deciduous, narrowly obovate. Pedicel 2–5 mm.
Flowers: 
Sepals broadly obovate to spatulate or oblong, reflexed in fruit, unequal, outer 2 sepals 3.5–4 mm, inner 3 sepals ca. 5 mm, glabrous, apex emarginate and distinctly mucronate, mucro directed outward. Corolla yellow, campanulate, 6–10 mm, outside glabrous, inside villous basally. Stamens ca. as long as corolla; filaments sparsely villous basally. Ovary globose, glabrous; stigma globose.
Fruits: 
Capsule depressed globose or broadly conical, 5–6 mm, reticulately (but not coarsely) wrinkled.
Seeds: 
Seeds trigonous-globose, 2.5–3.5 mm, puberulent to glabrous or woolly along angles and at hilum.
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.  

Cytology

Chromosome number: 
30
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.  

Biogeography, Ecology and Natural History

Distribution Map: 
Distribution: 

China (Fujian, Guangdong, Guangxi, Hainan, Jiangxi, Taiwan, Yunnan), ?Bangladesh, Cambodia, India, Indonesia, Japan (Ryukyu Islands, Ogasawara), Laos, Malaysia, Myanmar, Nepal, New Guinea, Pakistan, Philippines, Sri Lanka, Thailand, Vietnam; Africa, Australia(Western Australia, Northern Territory, Queensland), Pacific Islands. Introduced and naturalized in the American tropics as well (Colombia, Cuba, Guadeloupe, Martinique, Trinidad and Tobago).

Ecology: 

China: Scrub,
grassy roadsides in tropical areas; 100–800 m. 

Thailand: Often
in disturbed areas, ruderal land, vacant lots, roadsides, or dry deciduous
forest on limestone; altitude: 10–700 m. 

Phenology: 

Flowering: February, October, November, December; fruiting: January–March, October–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. 2010. Convolvulaceae. Fl. Thailand 10(3): 330–468.

Johnson, R. W. Austrobaileya 8: 55–63. 2009

Other information

Common names and uses: 
li lan wang (Chinese). Used medicinally for treating acute tonsillitis. Cha uek, ma uek, thao sa uek, sa uk da lueng (Thai).

Authorship for webpage

Editor: 
George Staples, Esmond Er
Contributors: 
Classification: 
Merremia hederacea
Fri, 2011-09-16 08:51 -- Esmond
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