Pogostemon szemaoensis (C.Y. Wu & S.J. Hsuan) Press (1982: 74)

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

26. Pogostemon szemaoensis (C.Y. Wu & S.J. Hsuan) Press (1982: 74) . Dysophylla szemaoensis C.Y. Wu & S.J. Hsuan in Wu et al. (1965: 238). Type: — CHINA. Yunnan: “juxta Sze-mao”, 1200 m, 27 November 1933, Y. Tsiang 12713 (holotype NAS!, isotypes NAS!, PE!).

Annual herbs, 20–40 cm tall. Stems solid, erect, trailing at base, with grooves, short branched, appressed strigose towards upper portion, baselly subglabrous and reddish. Leaves in whorls of 4; petiole absent; blade linear, 1.2–3.5 cm long, 1.8–3.5 mm wide, adaxially appressed ciliate, abaxially densely black glandular, densely ciliate along the midvein, base cuneate, margin remotely shallow serrate, flat or slightly revolute, ciliate, apex acuminate; midvein elevated abaxially, lateral veins inconspicuouse. Spike terminal, simple, 2–6 cm × 6–7 mm, continuous and compact; flowers subsessile. Bracts linear-lanceolate, ca. 2.5 mm long, almost as long as the corolla, gray villous, grayish purple-red, bracteoles linear or filform, less than 1 mm long. Calyx campanulate, ca. 1.2 × 1 mm, 5-veined, pilose outside; teeth 5, triangular. Corolla purplish, ca. 2 × as long as the calyx, exserted, subequally 4-lobed. Stamens 4, exserted; filaments bearded; anthers 1-locular, cell apex dehiscent; stigma bifid, equal. Nutlet unknown.

Distribution and habitat:— The species is known only from the type locality, Simao Shi, south Yunnan in China ( Figure 19 ). It grows in wet place at an elevation of about 1200 m.

Phenology:— Flowering in November.

Taxonomic notes:— The species is similar to Pogostemon cruciatus in habit, the differences between them are discussed under that species.

Figures

FIGURE 19. Distribution maps of Pogostemon szemaoensis, P. yatbeanus and P. quadrifolius.