Pogostemon chinensis 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

publication ID	https://doi.org/ 10.11646/phytotaxa.200.1.1
persistent identifier	https://treatment.plazi.org/id/016A8798-FFC5-270A-B4EF-E62050770702
treatment provided by	Felipe
scientific name	Pogostemon chinensis C.Y. Wu &Y.C. Huang
status

Treatment

3. Pogostemon chinensis C.Y. Wu &Y.C. Huang View in CoL in Wu et al. (1977: 742). Type: — CHINA. Yunnan: Yangbi , near Pingpo , 6 November 1946, T.N. Liou 22524 (holotype KUN!, isotypes IBSC!, PE!). Figure 3. View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 View FIGURE 7 View FIGURE 8 View FIGURE 9 View FIGURE 10

DENG & GE

Perennial herbs or subshrubs, to 0.5–2 m tall. Stems solid, erect, terete or obscurely angular, green or brown when dry, strigose, slightly dilated at nodes. Leaves opposite; petiole 0.5–5.5 cm long, strigose; blade ovate, 3–14 × 2–7 cm, papery or submembranous, adaxially strigose, abaxially strigose along veins, base cuneate-attenuate, margin double serrate to double crenate-serrate, apex acuminate, lateral veins 3 or rarely 4 pairs on each side of the midvein. Spikes terminal and axillary, 1.5–7.5 cm × 8–9 mm, interrupted or continuous, with more than two lateral branches; peduncle 0.5–2 cm long, densely strigose; verticillasters many-flowered, flowers sessile. Bracts and bracteoles broadly ovate, ovate, elliptic, or ovate-lanceolate, 3–5 mm long, 0.6–1.5 mm wide, subequal to or slightly longer than the calyx, strigose and densely glandular abaxially. Calyx subtubular, 3–4 mm long, 5-veined, strigose and sparsely glandular outside; teeth 5, narrowly triangular, subequal or 2 of them smaller, 0.7–1 mm long, ca. 1/3 as long as calyx tube, strigose inside, margin ciliate. Corolla reddish to purple, 4–5 mm long, exserted, 2- lipped, upper lip 3-lobed, minutely hirsute outside, lower lip entire. Stamens 4, exserted; filaments 4.5–5 mm long, beared at middle, bearded portion exserted. Anthers 1-locular, cell apex dehiscent. Style 6–7 mm long; stigma bifid, subequal, lobes ca. 0.7 mm long. Nutlets 4, obovoid or subglobose, 0.7–0.8 mm long, slightly flat abaxially, ribbed adaxially, black, shiny.

Distribution and habitat:— The species is endemic to China, occuring in (Yunnan and Guangxi) ( Figure 2 View FIGURE 2 ). It grows in thick forests, grasslands, or ravines at the elevation of 700–1600 m.

Phenology:— Flowering and fruiting from August to December.

Taxonomic notes:— Pogostemon chinensis resembles P. septentrionalis Wu & Huang (1977: 585) , but differs from the latter by the stems and leaves being evidently strigose (not subglabrous or sparsely strigillose, or sparsely strigillose only on veins of leaves).

Wu & Huang (1977) distinguished the two species by the characters of calyx. They considered that the calyx is subtubular, teeth narrowly triangular and ca. 1/3 as long as the calyx tube in P. chinensis , and calyx narrowly campanulate, teeth triangular and ca. 1/2 as long as calyx tube in P. septentrionalis . However, the ratio of the length of calyx teeth and calyx tube in P. septentrionalis is variable. Based on checking a large number of specimens, in P. septentrionalis , we found that the ratio of the length of teeth and calyx tube is variable from 1/3 to 1/2, and the shape of teeth is from narrowly triangular to triangular.