Gomphostemma leptodon Dunn (1913: 150)

Bongcheewin, Bhanubong, Ingrouille, Martin J. & Paton, Alan J., 2022, A revision of Gomphostemma (Lamiaceae), Kew Bulletin 77 (1), pp. 27-92 : 64-65

15. Gomphostemma leptodon Dunn (1913: 150) ;

? oan (1936: 1036); Li & Hedge (1992: 52); Phuong (2000: 106).

Type: Vietnam,?ong-dang [21.0665°, 106.93°], among bushes, Feb. 1886, 3alansa 1000 (K, lectotype selected here; isolectotypes G, P [P00686236]).

Shrub-like herb up to 3 m tall. Stems erect, upright, robust, obtusely quadrangular with longitudinal grooves, with dense stellate hairs and sometimes dendroid hairs. Leaoes petiolate, coriaceous, blades broadly ovate, 18 – 32 × 10 – 23 cm, apex acute, margin serrate, base cuneate, upper side tomentose with stellate hairs, lower side pale green tomentose with stellate hairs and robust venation; petioles quadrangular, 30 – 130 mm long, with dense stellate hairs. Inflorescence axillary with opposite cymes subsessile, branched then lax or rarely congested with axis not visible between flowers, inserted at the upper nodes at which leaves are usually present; verticils many-flowered, subtended by upper leaves only; peduncles 3 – 12 (– 13) mm long; bracts deciduous, ovate or lanceolate, 3 – 13 × 2 – 10 mm, apex acute, margin serrate, base cuneate, with stellate hairs on both sides; bracteoles narrowly lanceolate or linear, 3 – 10 mm long. Flowering calyx infundibular, 8 – 13 (– 13) mm long, prominently 10-ridged; tube 2 – 6 mm long, outside with dense stellate hairs and glandular-like simple hairs, and minutely glandular punctuate, inside with short simple hairs; lobes spreading, lanceolate-ovate, 2 – 5 mm long, outside densely tomentose with short stellate hairs, glandular-like simple hairs and minutely glandular punctuate, inside adpressed simple hairs. Fruiting calyx infundibular-cupular, 10 – 15 (– 20) mm long; tubes 2 – 5 mm long; lobes triangular, 6 – 10 (– 13) mm long, apex acuminate, margin revolute in cross section. Corolla white or yellow, 23 – 30 (– 60) mm long, throat inflated, abruptly dilated near the throat, outside sparsely simple hairs, inside glabrous; tube slender, incurved, 20 – 20 (– 30) mm long; posterior lip flat, 3 × 13 mm, apex and margin emarginate; anterior lip 10 mm long, median lobe obovate, apex and margin margin slightly undulate. Staminal filaments fleshy. Style slender, glabrous, shorter than corolla. Nutlets 3 – 2, globular or obovate, 2 – 3 mm long. Fig. 1E – F .

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

SPECIMENS EXAMINED. CHINA. Guangxi. Lungchow [22.3258°, 106.8358°], Mt A-chin, Feb., Morse 235 (lectoparatypes K 2 sheets). VIETNAM. Ha Nam: Kiên Khê [20.3031°, 103.8808°],?ông Bâu, 11 Nov.1883, 3on 2252 (P 2sheets); Kiên Khê,?ong Ham, 10 Jan.1891, 3on s.n. (P); Ha Tay: Tu Phap, Feb. 1885, 3alansa 2931 (P 2 sheets); Bavi?istr., Ba Vi National Park, 21°3.832&N 103°21.519&E, 600 m, 6 March 2005, Nguyen et al. HNK 1236 (de Kok 1203) (K); Pagode?ein Touan, sur la Mont Bavi, 23 Jan. 1889, 3alansa 2930 (P); Hoa Binh: Canton de Ki Son [Ky Son, 20.8822°, 103.335°], 30 m, 9?ec. 1926, Petelot 3002 (BM, P); Mai Chau, Van Mai [20.3865°, 103.02°], 21?ec. 1999, Phuong 2260 (HN 3 sheets); Tan Lac?istr., Quyet Chien Municipality, Hung Village, 20°32&38”N 103°11&36”E, 500 – 920 m, 30 Nov. 2003, Wu et al. 333 (HN); Yen Thuy, Yen Tri, 20 °22.20 &N 103°35.90&E, 120 m, 2 Jan. 2001, Loc et al. 10310 (P); Cho-bo (Riviere Noire) [20.5665°, 103.1665°], 16 Nov. 1885, 3alansa 2932 (P); Lao Cai: Sa Pa?istr., Khoang Village, 22°22&28”N 103°25&21.3”E, 1500 m, 22 April 1986, Phuong 122 (HN, K); Nam?inh: Co Nghia, 28 Nov. 1913, Cheoalier 29211 (P); Nghe An: Con Cuong, Yen Khe Commune, Trung Huong Hamlet, Cay?a Valley, 18°38&10.2”N 102°28&8.8”E, 13 Oct. 2008, Du et al. HNK 2925 (K); Quy Hop?istr. [19.333°, 103.165°], Chau Thai Commune, Ban Nha Village, 15 March 2005, Nguyen et al. HNK 1652 (K 2 sheets); Pu Mat National Park, Khe Kem Waterfall, 18°38&10.2”N 102°28&8.8”E, 13 Oct. 2008, Du et al. HNK 2821 (K); Ninh Binh. Cuc Phuong National Park, 20°21&N 103°33.55&E, 330 m, 22 Nov. 1998, Soejarto et al. 10360 (L, P); Phu Yen. Cho Ganh [13.2833°, 109.23°], Feb. 1923, Petelot 868 (P 2 sheets); Quang Binh.?ong Hoi?istr., Phong Nha-Ke Bang National Park [15.3352°, 106.1313°], Son Trach commune, 230 m, 22 March 2005, Nguyen et al. HNK 1813 (K 2 sheets); Quang Ninh.?ong-dang, Feb. 1886, 3alansa 1000 (lectotype K; isolectotypes G, P); Thanh Hoa. Ba Thuoc, Pu Loung Nature Reserve [20.2665°, 103.1525°], 20 Nov. 2002, Phuong 3593 (HN); Thanh Hoa, Ben En National Park [19.6165°, 103.323°], 13 Jan. 2006, Sam HVS 063 (L).

HABITAT. In primary lowland, evergreen forest, limestone mountains, 30 – 1500 m.

CONSERVATION STATUS. Widespread; Least Concern (LC).

PHENOLOGY. Flowering and fruiting October – April.

NOTES. Gomphostemma leptodon is recognised by a large corolla, almost 23 – 30 (– 60) mm long and robust venation, especially on the lower side. It is morphologically similar to G. grandiflorum by having fruiting calyx lobes revolute in cross section but G. leptodon has the fruiting calyx lobes longer than the tube at maturity.

Figures

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

Fig. 1. A – B Gocphostecca castersii: A tuber-like roots; B corolla with inflated throat. C G. parvifloruc: axillary inflorescence and corolla with narrow throat. D G. javanicuc: fleshy nutlets. E – F G. leptodon: E axillary inflorescence; F flower, note calyx lobes longer than the tube and corolla with inflated throat. PHOTOS: A – B & D THAMMARAT PHUTTHAI; C;HANU;ONG; ONGCHEEWIN; E – F MAXIM NURALIEV.