Pogostemon barbatus Bhatti & Ingrouille (1997: 109)

YAO, GANG, DENG, YUN-FEI & GE, XUE-JUN, 2015, A Taxonomic Revision Of Pogostemon (Lamiaceae) From China, Phytotaxa 200 (1), pp. 448-450 : 448-450

16. Pogostemon barbatus Bhatti & Ingrouille (1997: 109) . Type:— CHINA. Hong Kong : Fau Tan Valley, 12

October 1972, S.Y. Hu 12319 (holotype K!). Figure 12 .

Dysophylla auricularia (L). Blume var. gigantea Doan (1936: 965) , nom. inval. Pogostemon auricularius var. giganteus (Doan) Hô ex Budantzev (1999: 22) , nom. inval. “ Types ”:— CAMBODIA. Battambang: Avaichek , 20 October 1927, E. Poilane 14287 (P!). LAOS . Poukhane , no date, A. Spire 119 (P) . Luang Prabang: in 1899, D.J. Du Puy 183 (P!). VIETNAM . Cao Bang: “ Tonkin, Nam-kep , sur le Pia-ouac”, July 1932, A. Petelot 714 (P!) . Da Nang: “ Annam, Tourane ”, May– July, 1927, J. & M.S. Clemens 3037 (P!) . Hai Duong: “ Tonkin, Lam, Sept-Pagodes ”, September 1909, S. Mourel 279 (P!) . Ha Nam: Phu Ly , in 1919, M. d’Alleizette 243 (P!) . Hanoi: “ Tonkin, Kien De, Tu Phap ”, 7 October 1891, B. Balansa 4462 (P!) . Lang Son: 21 October 1911, H. Lecomte & A. Finet 88 (P!) . Lao Cai: “ Tonkin, Lao-Kay, route de Lao-Kay à Muong Xen ”, 4 December 1913, A. Chevalier 29283 (P!) ;. Ninh Binh: “ Tonkin, Khang Thuong, avoras nemoris Má Cò ”, 21 October 1880, H. Bon 31 (P!); “Tonkin, Khang Thuong, avoras nemoris Má Cò, 21 October 1880, H. Bon 829 (P!) . Ninh Thuan: “ Annam, Cana, Prov. Phanrang ”, 2 December 1928, E. Poilane 9407 (P!) . Phu Tho: “ Tonkin , La Phu, Prov. Phu-Tho”, no date, P.A. Eberhardt 4385 (P!) . Quang Tri: “ Annam, Prov. Quang Tri, Centre Le Boi et Ba Thung ”, 9 June 1927, E. Poilane 13408 (P!) . Thua Thien-Hue: “ Annam , Thua Thien”, no date, P.A. Eberhardt 1505 (P!) .

Annual herbs, 0.4–1 m tall. Stem terete or angular, solid, procumbent or diffuse basally, rooting at nodes, ascending, upward branched sometimes, grayish brown, densely hirsute. Leaves opposite; petiole 0.5–2.5 cm long, strigose, blades 3–9 × 1.5–3.5 cm, black or dark brown when dry, oblong-clavate, elliptic, narrowly elliptic or narrowly oblong, base broadly cuneate to cuneate, margin serrate, crenate, or double crenate, apex bluntly acute or round, hirsute, with golden, sunken glands. Spike terminal, simple, 3–9 cm long, 6–9 mm wide; peduncle subsessile to 2 cm long; flowers subsessile. Bracts and bracteloes clavate-oblanceolate or linear, 1–2.5 mm long, margin ciliate. Calyx campanulate, 1.5–1.7 mm long, 5-veined, outside glabrous, with sparsely golden glandular, inside glabrous; teeth 5, triangular, subequal, 0.4–0.5 mm long, incurved in fruit, glabrous inside, margin ciliate. Corolla white or pink, ca. 2.5 mm long, exserted, sparsely hairy outside, subequally 4-lobed. Stamens 4, much exserted; filaments ca. 3.2 mm long, inserted at the middle of corolla tube, glabrous at base, bearded towards the

POGOSTEMON ( LAMIACEAE )

Phytotaxa 200 (1) © 2015 Magnolia Press • 25 middle of filaments on one side, bearded portion exserted; anthers 1-locular, cell apex dehiscent; style ca. 4 mm long; stigma bifid, equal, lobes 0.4–0.5 mm long. Nutlets 4, 0.6 × 0.5 mm, oblong or obovoid, brown or dark brown.

Distribution and habitat:— The species is distributed in China, Cambodia, Laos and Vietnam. In China, it occurs in Hainan, Hongkong, Macao, Guangdong and Guangxi provinces ( Figure 10 ).

Phenology:— Flowering and fruiting from April to November.

Taxonomic notes:— Pogostemon barbatus resembles P. auricularius , differences between them are discussed under the latter species.

Dysophylla auricularia var. giganteus Doan is an invalid name because it was only described in French and no Latin diagnosis was provided, not in agreement with Article 39.1 of the ICN ( McNeill et al. 2012). The authors checked all collections in herbarium P cited by Doan (1936) in the protologue, but only the collection Poilane 9407 was annotated with “ Dysophylla auricularia var. gigantea ”.

26 • Phytotaxa 200 (1) © 2015 Magnolia Press

DENG & GE

Figures

FIGURE 10. Distribution maps of Pogostemon fraternus, P. hispidocalyx, P. auricularius and P. barbatus.

FIGURE 12. A–M. Pogostemon barbatus. A. Habit; B. Leaf; C. Flower; D. Calyx; E. Calyx split; F. Corolla split open with stamens; G. Nutlets; H–M. Bracts and bracteoles. Drawn by Y. X. Liu based on G. Yao 274 (IBSC).