Ipomoea sagittifolia

Nomenclature

Accepted name/Authority/Place of publication: 

Ipomoea sagittifolia Burm. f., Fl. Indica p 50. plate 18, fig. 2. 1768. 

Synonyms: 

Convolvulus marginatus Desr. in Lam., Encycl. 3: 558. 1791.

C. verrucosus (Blume) D. Dietrich

Ipomoea sepiaria Koenig ex Roxb., Fl. Ind. 2: 90. 1824. 

I. subtrilobans Miquel

I. verrucosa Blume

Ipomoea marginata (Desr.) Manitz, Feddes Repert. 85: 638. 1974; Verdc., Kew Bull. 42: 658. 1987, superfluous combination. 

Misapplied name: Ipomoea maxima authors not (L.f.) G.Don: e.g., Ooststr., Blumea 3: 525. 1940; Fl. Males. I, 4: 472. 1953; Kerr, Fl. Siam. 3(2): 14. 1954. 

Description

Habit: 
Herbs perennial, with a stout root and spreading hirsute or glabrous axial parts. Stems twining or prostrate, 1–3 m.
Leaves: 
Petiole 1–3 cm, sometimes minutely tuberculate; leaf blade often purple or purple spotted, elliptic-ovate or reniform to circular, apical leaves sometimes sagittate or hastate, 2–6 × 2–5 cm, glabrous, ciliolate marginally, base deeply cordate or hastate, margin entire or minutely undulate, apex attenuate or ± abruptly acuminate.
Inflorescences: 
Inflorescences few to several flowered; peduncle 2–8 cm, thick, often applanate, verruculose distally; bracts persistent, ovate or oblong, ca. 2 mm. Pedicel 5–6 mm, sparsely verruculose.
Flowers: 
Sepals ovate or elliptic-oblong, equal or inner sepals longer, 4–7 mm, glabrous, apex obtuse; outer 2 sepals verruculose, margin thinner. Corolla white or purple, with a darker center, ± salverform, 2.5–4 cm; lobes 5, apiculate. Stamens included. Pistil included; ovary glabrous; stigma 2-lobed.
Fruits: 
Capsule depressed-globose, 6–7 mm, glabrous.
Seeds: 
Seeds pale grayish-white tomentellous, margin often with longer cobwebby hairs.
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 (Hainan, Taiwan), India, Indonesia, Laos, Malaysia, Myanmar, New Guinea, ?Pakistan, Sri Lanka, Thailand, Vietnam; Africa, N Australia, Pacific Islands.

Ecology: 

China: Often coastal or on
saline soils, in thickets, grasslands, fields and waste areas. 

Thailand: Weedy in vacant lots,
roadsides, waste ground and disturbed areas, often in damp to wet soils; altitude:
sea level to 25 m. 

Phenology: 

Flowering: July–December; fruiting: 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. 

Other information

Common names and uses: 
mao jing shu (Chinese). Sa uek (Smitinand 2001).
General comments: 

This ubiquitous weedy Asian species has often been misidentified in the literature and in the herbarium as Ipomoea maxima (L. f.) Sweet, a distinct species. Staples & Jacquemoud (in Candollea 60: 451. 2005) resolved that status of the oldest available name, which had long been ambiguous because the type specimen was missing. 

Authorship for webpage

Editor: 
George Staples, Esmond Er
Contributors: 
Classification: 
Ipomoea sagittifolia
Wed, 2011-09-21 07:32 -- Esmond
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