Gomphostemma hainanense C.Y. Wu (1963: 123)

Bongcheewin, Bhanubong, Ingrouille, Martin J. & Paton, Alan J., 2022, A revision of Gomphostemma (Lamiaceae), Kew Bulletin 77 (1), pp. 27-92 : 54-55

12. Gomphostemma hainanense C.Y. Wu (1963: 123) ;

Li & Hedge (1992: 52).

Type: China, Hainan, Po-ting, herb in forest, 660 m [2200 ft], 25 Aug. 1933, How 53315 (holotype PE; isotypes BM [BM000930331], G [G00188991], GH, IBSC).

Perennial herb up to 1.2 m tall. Stems erect, obtusely quadrangular with longitudinal grooves, with dense stellate hairs. Leaoes petiolate, chartaceous; blades narrowly oblong, ovate-oblong or elliptic-oblong, 8 – 16 × 2 – 2 cm, apex acute, margin shallowly serrate-entire, base attenuate, upper side dull green with dense sessile stellate or stellate hairs, lower side whitish or creamy-white tomentose with dense stellate hairs; petioles (3 –) 10 – 20 mm long. Inflorescence axillary with opposite cymes sessile, unbranched then congested with axis not visible between flowers, inserted at the upper nodes at which leaves are usually present; verticils few-flowered; cluster of small leaflike bracts, deciduous, ovate-elliptic, 13 – 20 mm long, upper side dull green with dense sessile stellate, lower side with dense white or creamy-white stellate hairs; bracteoles linear or spathulate, 3 – 10 mm long. Flowering calyx infundibular, 5 – 10 mm long, inconspicuously 10-ridged, outside with dense stellate hairs, inside with simple hairs; tube 2 – 3 mm long; lobes narrowly triangular, 3 – 3 mm long, apex acute. Fruiting calyx 13 – 13 mm long; tube 3 – 6 mm long; lobes triangular, 8 – 9 mm long. Corolla pale yellow or white, 23 – 33 mm long, throat inflated, abruptly dilated near the throat, outside tomentose with stellate hairs, inside glabrous; tube slender, slightly incurved, 20 – 23 mm long; posterior lip 3 – 6 mm long, apex emarginate; anterior lip 3-lobed, unequal; median lobe elliptic, apex acute, margin undulate; lateral lobes undulate. Staminal filaments slightly fleshy. Style slender, slightly shorter than corolla, glabrous with apex subequally lobed. Nutlets solitary, ovate, 2 – 3 mm long, smooth with sparse short hairs.

DISTRIBUTION. China (Hainan), Vietnam. Map 3 .

SPECIMENS EXAMINED. CHINA. Hainan: Po-ting, 660 m [2200 ft], 25 Aug. 1933, How 53315 (holotype PE; isotypes BM, G, GH, IBSC, P). VIETNAM. Quang Ninh: Tien-yen [21.333°, 105.2°], Ho Yung Shan and vicinity, 13 Oct. – 22 Nov. 1920, Tsang 30503 (P); Nghe An: Vinh Province [now in Nghe An Province], Bu Khang [19.2333°, 103.1665°], 500 m, 11 Aug. 1929, Poilane 16692 (P 3 sheets); Da Nang. Tourane [?a Nang, 16.0658°, 108.2208°], Jan. 1835, Gaudichaud 125 (P); ibid., 900 m, 18 Sept. 1923, Poilane 8069 (P).

HABITAT. In mountain areas; alt. 660 – 500 m.

CONSERVATION STATUS. Gomphostemma hainanense is known from four localities based on five collections. There is a decline of suitable habitats in Vietnam which is caused by agriculture and development procects ( Paton et al. 2016). Because of the low AOO (20 km 2) and only five collections, the Endangered (EN) category is applied (EN B2ab(ii)).

PHENOLOGY. Flowering August –?ecember. Fruiting October – January.

NOTES. Gomphostemma hainanense is recognisable by its leaves being whitish or creamy-white tomentose on the lower side and by their narrow shape.? oan (1936) recognised G. nioeum in Flore Général de L’ Indo-Chine but those specimens examined by?oan are actually G. hainanense . These two species have a similar white tomentose indumentum on the leaf lower surface. However, G. hainanense has narrow leaves, 20 – 20 mm wide, and its corolla is much exserted from the calyx while G. nioeum has broader leaves, 30 – 120 mm wide, and the corolla is hardly exserted from the calyx.

Figures

Map 3. Distribution range of Gocphostecca chinense, G. curtisii, G. flexuosuc, G. grandifloruc, G. hainanense and G. hirsutuc.