Gomphostemma microdon Dunn 1913
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 microdon

description: <b>25. Gomphostemma microdon</b> <i>Dunn</i> (1913: 150); ? oan (1936: 1031); Li &amp; Hedge (1992: 51); Phuong (2000: 100). Type: China, Yunnan, Szemao [22.5665°, 101.0833°], forest west, 1330 m, <i>Henry</i> 12301 (holotype K [K000928850]; isotypes A n.v., K [K000928851], NY [00000511]). <i>Gomphostemma deltodon</i> C.Y. Wu (1963: 123). Type: Ch ina, Yunn an, Ji ngh ong, Ch e-l i Hsien [21.9833°, 100.8165°], 930 m, Aug. 1936, <i>Wang</i> 53323 (holotype PE; isotype A n.v.). Erect herb up to 1 m tall. <i>Stems</i> robust, obtusely quadrangular, with dense stellate hairs; internodes straight. <i>Leaoes</i> petiolate, spreading, chartaceous; blades elliptic, elliptic-ovate or obovate, 13 – 23 × 3 – 9 cm, apex acute, margin serrate, base cuneate, upper side dark green with sessile stellate hairs, lower side pale green tomentose with dense stellate hairs and dendroid hairs confined on midrib and veins; petioles 20 – 33 mm long. <i>Inflorescence</i> axillary, raceme-like, elongated, lax with axis visible between cymes, unbranched, 30 – 80 mm long with opposite cymes reduced, inserted at the upper nodes at which leaves are usually present; verticils 1 – 2-flowered, subtended by the upper leaves; peduncles 20 – 50 mm long, with dense stellate hairs; bracts exceeding calyx, elliptic or broadly ovate, 13 – 20 × 6 – 9 mm, apex acute, margin shallowly serrate, base cuneate, with stellate hairs on both sides; bracteoles obovate, 5 – 10 × 1 – 2 mm, with dense stellate hairs on both sides. <i>Flowering calyx</i> greyish-light green, infundibular, 3 – 8 mm long, 10- ridges; tube 2 – 6 mm long, outside with dense stellate hairs, inside glabrous; lobes short triangular, 1 – 2 mm long, apex acute, margin marginate, outside with dense stellate hairs, inside with adpressed simple hairs. <i>Fruiting calyx</i> infundibular, 3 – 5 mm long; tube 2 – 6 mm long; lobes triangular, c. 1 mm long, apex acute, margin marginate. <i>Corolla</i> yellow or reddish-yellow, (13 –) 20 – 23 (– 33) mm long, throat inflated, abruptly dilated near the throat, outside with stellate hairs, inside with an annulus of simple hairs; tubes slender, slightly incurved, 20 – 23 mm long; posterior lip semi-circular, 2 – 3 mm long; anterior lip 3-lobed, spreading; median lobe broadly ovate, 5 – 10 × 3 – 10 mm, slightly undulate; lateral lobes ovate, apex round. <i>Staminal filaments</i> slightly fleshy. <i>Style</i> slender, glabrous with apex unequally lobed. <i>Nutlets</i> 1 – 2, elliptic-ovate, 2 – 3 mm long, tomentose. <b>DISTRIBUTION.</b> China (Yunnan), Vietnam, Thailand, Laos. Map 5. <b> SPECIMENS EXAMINED. CHINA. Yunnan. Menglun, Mengla [21.2665°, 101.3833°], 15 Sept. 1983, <i>Sino-American Expedition to Yunnan</i> 191 (KUN 2 sheets);</b> Che-li Hsien, 930 m, Aug. 1936, <i>Wang</i> 53323 (holotype of <i>Gomphostemma deltodon</i>, PE); Szemao, W Forest, 1330 m [2300 ft], <i>Henry</i> 12301 (holotype of <i>G. microdon</i>, K; isotypes K, NY). <b>VIETNAM.</b> Hoa Binh. Mai Chau, Hang Kia [20.665°, 103°], 3 Oct. 2000, <i>Phuong</i> 3319 (HN 3 sheets); Son La. Phu Yen?istr. [21.1995°, 102.5883°], 9 Aug. 2009, <i>Cuong &amp; Cuong</i> 2093 (HN 2 sheets); Moc Chau [21.833°, 102.53°], 13 April 1988, <i>Phuong</i> 29 (HN 2 sheets); <b>UNLOCALISED</b>. <i>Lemarie</i> s.n. (P 2 sheets); <i>3alansa</i> s.n. (P). <b>LAOS.</b> Sayabouly. Pak Lai [18.2°, 101.2165°], 1866 – 1868, <i>Thorel</i> 3362 (P 2 sheets); <b>UNLOCALISED</b>. <i>Counillon</i> s.n. (P). <b>THAILAND.</b> Chiang Mai. Jawm Tong [Chom Thong], Mae Soi Subdistr. [18.2565°, 98.6356°], Mae Soi Valley, 223 m, 11 Nov. 1990, <i>Maxwell</i> 90-1238 (AAU, L); Nan. Phu Ka [19.1992°, 101.0569°], 200 m, 28 Aug. 1938, <i>Somkid</i> 151 (BKF). <b>HABITAT.</b> In disturbed deciduous forest, limestone area, 200 – 1330 m. <b>CONSERVATION STATUS.</b> <i>Gomphostemma microdon</i> has been regularly collected from the field. However, an AOO of 22 km 2 falls under EN and the EOO of 236,582.12 km 2 under LC. The Least Concern (LC) category is applied. <b>PHENOLOGY</b>. Flowering and fruiting April – November. <b>NOTES.</b> <i>Gomphostemma microdon</i> is a remarkable species recognised by having short calyx lobes, 1 – 2 mm long, and spreading inflorescence with bracts exceeding calyx. It is morphologically similar to <i>G. dolichobotrys</i> and <i>G. repentum</i> by having an unbranched, racemelike inflorescence. Wu circumscribed <i>G. deltodon</i> on the basis of its slightly larger calyx (Wu 1963). However, calyx length is variable throughout the distribution of this species.
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 74-75, DOI: 10.1007/s12225-021-09991-y, http://zenodo.org/record/7615581
description: {"references": ["? oan, T. (1936). Labiatae. In: H. Lecomte (ed.), Flore Generale de L' Indo-Chine 2: 913 - 1026. Masson, Paris.", "Li, X. W. &amp; Hedge, I. C. (1992). Lamiaceae. In: Z. Y. Wu &amp; P. H. Raven (eds), Flora of China 15: 30 - 299. Science Press, Beicing.", "Phuong, V. X. (2000). Lamiaceae (Labiatae). In: N. T. Ban, T.?. Ly, T. C. Khanh, P. K. Loc, N. N. Thin, N. V. Tien &amp; N. K. Khoi (eds), Flora of Vietnam 2: 1 - 258. Science &amp; Technics Publishing House, Hanoi.", "Wu, C. Y. (1963). Gomphostemma. In: C. Y. Wu, H. W. Li, S. J. Hsuan &amp; Y. C. Huang, Materiae ad floram labiatarum sinensium (1). Acta Phytotax. Sin. 10: 123 - 166."]}