Jacquemontia tomentella

Nomenclature

Accepted name/Authority/Place of publication: 

Jacquemontia tomentella (Miquel) Hallier f., Versl. ‘s Lands Pl.-tuin Btzg. 1895 (1896) 126.

Synonyms: 

Lettsomia tomentella Miquel, Fl. Ind. Bat. Suppl. (1861) 560.

Description

Habit: 
A large, woody twiner to 12 m high. Stems terete, angular upwards, the younger parts densely puberulent with minute stellate (7–13-rayed) pale yellowish brown hairs, making the impression of being farinose, adult parts glabrescent, fistulose.
Leaves: 
Leaves ovate, 6–14 by 4–10 cm, rounded or slightly cordate at the base, acuminate at the apex, stellately puberulent like the stems, paler beneath than above, glabrescent above; lateral nerves 6-7 on either side of the midrib, prominent beneath; secondary nerves parallel; petiole 2-4½ cm, puberulent like the stems, longitudinally grooved above.
Inflorescences: 
Peduncles axillary, puberulent like the stems, shorter or longer than the leaves, corymbosely branched above; flowers in dense umbelliform inflorescences, forming large, more or less unilateral panicles at the end of the branches. Pedicels 3- 6 mm. Lower bracts sometimes foliaceous, upper ones much smaller.
Flowers: 
Sepals about equal in length, 5- 6 mm; two outer ones ovate, obtuse, three inner ones broad-ovate to orbicular, concave, all puberulent outside and with minute glandular dots, glabrous inside. Corolla funnel-shaped, 14-15 mm long or more, pink or white, with 5 densely pilose midpetaline bands. Filaments with dilated, pilose base. Ovary pilose; style pilose near the base; stigmatic lobes thick, nearly globular, wrinkled.
Fruits: 
Capsular, more or less cupped by the enclosing calyx, dark brown, 8-11 mm long, glabrous or hairy on the apical part, valves 4-8 or more.
Author: 
S.J. van Ooststroom
References: 

Ooststroom, S.J. van & R.D.Hoogland. 1953. Convolvulaceae in FloraMalesiana 4: 434.

Biogeography, Ecology and Natural History

Distribution: 

Borneo (Brunei, Sabah, Sarawak, Kalimantan), Sumatra (W and C parts); a literature report for Vietnam requires confirmation.

Other information

Common names and uses: 
Akar kumiet (Sumatra, W. Coast), lehu-lehu (Sumatra, Djambi).
General comments: 

All parts of the plant are covered with a dense pubescence consisting of very small scale-like stellate hairs, with 7-13 short rays.

Phylogeny and infrageneric relationships: 

KEY TO THE VARIETIES

 1. Sepals 5-6 mm long. Corolla ca
15 mm long. Hairs minute, with 7–13 rays.      var. tomentella

1. Sepals 3–4 mm long. Corolla 8–10 mm long.

2. Hairs of two kinds, for the
greater part with 7–13 rays like in var. tomentella, the others with 8–10
rays, one of which is much longer and erect                                                               var. heteroradiata

2. All hairs of the same kind.

3. Hairs with 7–13 rays                                                                        var. micrantha

3. Hairs with 3–4(–5) rays                                                                    var.
tomentosa

Authorship for webpage

Editor: 
G. Staples
Contributors: 
Classification: 
Jacquemontia tomentella

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