Gomphostemma flexuosum 3 ongch.
Creators: name: Bongcheewin, Bhanubong
name: Ingrouille, Martin J.
name: Paton, Alan J.
Publisher: name: Zenodo
Year: 2022
Subjects: Biodiversity
Taxonomy
Plantae
Tracheophyta
Magnoliopsida
Lamiales
Lamiaceae
Gomphostemma
Gomphostemma flexuosum

description: <b> 12. Gomphostemma flexuosum <i>3ongch.</i></b> <b>sp. nop.</b> Type: Thailand, Chaiyaphum, Phu Khiew Wildlife Sanctuary, 10 km from Headquarters to main road, 800 m, 11 Oct. 1998, <i>Suddee et al.</i> 933 (holotype K [K001081922]; isotypes BKF, TC?). http://www.ipni.org/urn:lsid:ipni.org:names:55221332-1 Sprawling herb. <i>Stems</i> slender, scrambling, obtusely quadrangular with shallowly longitudinal grooves, tomentose with stellate hairs; internodes of leafy and flowering shoots appearing wavy, always twisting. <i>Leaoes</i> petiolate or subsessile, spreading, chartaceous; blades elliptic, elliptic-ovate or oblanceolate, 3 – 13 × 2.3 – 8 cm, apex acute, margin serrate to subentire, base cuneate or attenuate, upper side scabrid with stiff hairs, lower side pale green tomentose with stellate hairs with a 1-celled stalk; petiole 3 – 20 mm long. <i>Inflorescence</i> axillary with opposite cymes sessile, unbranched then congested with axis not visible between flowers; verticils 2 – 10-flowered, inserted at the upper nodes at which leaves are usually present; bracts oblanceolate, 6 – 13 × 2 – 3 mm, with dense stellate hairs on both sides; bracteoles linear or sometimes falcate. <i>Flowering calyx</i> infundibular, 5 – 10 mm long, 10-ridged, outside with dense stellate hairs with a 1- celled stalk and dendroid hairs, inside with simple hairs; tube 3 – 2 mm long; lobes narrowly triangular, 2 – 6 mm long, apex acuminate. <i>Fruiting calyx</i> infundibular, 10 – 12 mm long; tube 2 – 3 mm long; lobes triangular, 6 – 5 mm long. <i>Corolla</i> white, 13 – 20 (– 23) mm long, throat inflated, abruptly dilated near the throat, outside with sessile stellate hairs, inside glabrous; tube slightly incurved, 12 – 15 mm long; posterior lobe shorter than anterior lobes, outside with sessile stellate hairs and glandular-like simple hairs, inside sparsely tomentose near throat; anterior lobes spreading; median lobes broadly ovate, 2 – 3 mm long, apex slightly emarginate; lateral lobes ovate. <i>Staminal filaments</i> fleshy, glabrescent. <i>Disk</i> lobed, slightly tumescent behind. <i>Style</i> slender with subequally lobed apex. <i>Nutlets</i> solitary, immature seen. Fig. 2. <b>RECOGNITION</b>. <i>Gomphostemma flexuosum</i> is recognised by having sprawling habit, flowering shoots appearing wavy with curving internodes, calyx lobes longer than the tube, short corolla, 13 – 20 (– 23) mm long and found in open and dry areas. It is morphologically similar to <i>G. melissifolium</i> by having an incurved corolla tube, coarse indumentum on the upper side of leaves and inflated corolla throat. <b>DISTRIBUTION.</b> Vietnam, Laos, Thailand. Map 3. <b> SPECIMENS EXAMINED. VIETNAM.?ong Nai: Langahn [Long Khanh], Station de Langanh,?u Haut?anai, 1000 – 1200 m, 3 Oct. 1932, <i>Poilane</i> 21030 (P).</b> <b>LAOS.</b> Champasak: Mekong, Se?on, 1866 – 1868, <i>Thorel</i> 2221 (P 6 sheets). <b>THAILAND.</b> Sakon Nakhon: Phu Phan National Park, 15°03&amp;N 103°38&amp;E, 220 m, 20 Oct. 1998, <i>Suddee et al.</i> 1012 (K); ibid., <i>Chantaranothai et al.</i> 528 (BKF); Chaiyaphum: Phu Khiew Wildlife Sanctuary, 10 km from Headquarters to main road, 800 m, 11 Oct. 1998, <i>Suddee et al.</i> 933 (holotype K; isotypes BKF, TC?); Nakhon Ratchasima: Pak Thong Chai, Sakaerat Forest Research Station, along Huai Krae Stream, 12°23&amp;N 102°E, 200 m, 1 Nov. 1969, <i>oan 3eusekom &amp; Charoenpol</i> 1992 (AAU, BKF, L); Ban Kaeng Khlo, 200 m, 15 Sept. 1951, <i>Vidal</i> 3118 (AAU, P); Buri Ram: Khao Phanom Rung, 12°32&amp;N 102°36&amp;E, 3 Oct. 1982, <i>Murata et al.</i> T-35323 (BKF); Saraburi: Muang, Sahm Lahn Forest, 130 m, 13?ec. 1953, <i>Maxwell</i> 53-533 (AAU, BK); Ban Nawng Bua [12.3880°, 100.5632°], 2 Oct. 1925, <i>Put</i> 1136 (BK, BM, GH, L, SING). <b>HABITAT.</b> In dry dipterocarp, fire-influenced open forest; alt. 130 – 1200 m. <b>CONSERVATION STATUS.</b> This species has been collected from several conservation areas in Thailand. Least Concern (LC). <b>PHENOLOGY.</b> Flowering September –?ecember. <b>NOTES.</b> The epithet <i>flexuosum</i> [<i>flexuosum</i>, zigzag] refers to its wavy stem.
description: Published as part of <i>Bongcheewin, Bhanubong, Ingrouille, Martin J. &amp; Paton, Alan J., 2022, A revision of Gomphostemma (Lamiaceae), pp. 27-92 in Kew Bulletin 77 (1)</i> on pages 53-54, DOI: 10.1007/s12225-021-09991-y, http://zenodo.org/record/7615581