Pogostemon xanthiiphyllus C.Y. Wu &Y.C. Huang

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

11. Pogostemon xanthiiphyllus C.Y. Wu &Y.C. Huang in Wu et al. (1977: 744). Type: — CHINA. Yunnan: Mengla Xian , Longlin , 720 m, 19 October 1959, H.T. Tsai 59-11069 (holotype KUN!, isotype KUN!).

Perennial herbs or subshrubs, 0.5–1 m tall. Stems solid, 4-angular, branched, densely minutely setose, slightly dilated at nodes. Leaves opposite; petiole 0.5–4.5 cm long, densely setose; blade ovate to broadly ovate, 3–8.5 × 2–6.5 cm, adaxially dark green, densely minutely hispid on both sides, base broadly cuneate to rounded, margin double incised-serrate or irregular double serrate, apex acute to short acuminate, lateral veins 2 or 3 pairs on each side of the midvein. Spikes 2–11 cm long, 7–9 mm wide, terminal and axillary, continuous, or interrupted basally sometimes, with more than two lateral branches, densely hispid; peduncle 0.5–2 cm long; verticillasters 3–14-

POGOSTEMON ( LAMIACEAE )

Phytotaxa 200 (1) © 2015 Magnolia Press • 19 flowered, flowers sessile. Bracts and bracteoles sessile, oblong-lanceolate to broadly lanceolate, ca. 3 mm long, slightly shorter than calyx, midvein sparsely hispid, margin minutely hispid. Calyx campanulate, 3.5–4 mm long, 5-veined, minutely hispid along veins, sparsely pubescent inside; teeth 5, triangular to narrowly triangular, subequal, ca. 0.9 mm long, about 1/3 as long as the calyx tube, margin rigidly ciliate. Corolla white or yellow, 3.5–4 mm long, subequal or slightly exserted from calyx, 2-lipped, upper lip 3-lobed, lower lip entire. Stamens 4, posterior filaments longer, bearded at middle, anterior 2 glabrous; anther 1-locular, cell apex dehiscent; stigma bifid, lobes subequal. Nutlet unknown.

Distribution and habitat:— The species is endemic to China, occurring in S Yunnan ( Figure 7 ). It occasionally grows in forests or forest margins, at the elevation of 720–1100 m.

Phenology:— Flowering from September to October.

Taxonomic notes:— This species is similar to Pogostemon formosanus in having the leaf margin double incised-serrate. Differences between them are discussed under the latter.

20 • Phytotaxa 200 (1) © 2015 Magnolia Press

DENG & GE

II. Pogostemon subgen. Allopogostemon Bhatti & Ingrouille (1997: 97 ; nom. inval.). ex Gang Yao, Y. F. Deng & X. J. Ge, subgen. nov. Type: Pogostemon vestitus Benth.

Pogostemon sect. Racemosae Bentham (1833: 155) . Lectotype (here designated): Pogostemon vestitus Benth. According to Article 39.1 of the ICN ( McNeill et al. 2012), the name Pogostemon subgen. Allopogostemon Bhatti & Ingrouille (1997: 97) is invalidly published because no type was designated. Here we validate the name through designating Pogostemon vestitus Benth. as its type.

When Bentham (1833: 155) established the name Pogostemon sect. Racemosa , eight species were included in the section. Here we choose Pogostemon vestitus Bentham (1830: 31) as the lectotype.

Figures

FIGURE 7. Distribution maps of Pogostemon parviflorus, P. septentrionalis, P. xanthiiphyllus and P. brachystachys.