Pogostemon pentagonus (C.B. Clarke ex Hook.f.) Kuntze (1891: 530)
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publication ID |
https://doi.org/ 10.11646/phytotaxa.200.1.1 |
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persistent identifier |
https://treatment.plazi.org/id/016A8798-FFD2-271F-B7C4-EC17515C00CA |
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treatment provided by |
Felipe |
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scientific name |
Pogostemon pentagonus (C.B. Clarke ex Hook.f.) Kuntze (1891: 530) |
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Phytotaxa 200 (1) © 2015 Magnolia Press • 31 23. Pogostemon pentagonus (C.B. Clarke ex Hook.f.) Kuntze (1891: 530) View in CoL . Dysophylla pentagona C.B. Clarke ex Hooker (1885: 641) . Eusteralis pentagona (C.B. Clarke ex Hook.f.) Panigrahi (1976: 477) . Anuragia pentagona (C.B. Clarke ex Hook.f.) Raizada (1976: 219) . Type: — INDIA. Bihar: Chota Nagpur, Singhboom, 28 October 1873, C.B. Clarke 20438 (holotype K!).
Annual herbs, 10–40 cm tall. Stems solid, terete, erect-ascending, base trailing, glabrous. Leaves in whorls of 4, sessile; blade linear to oblanceolate, 1–2.5 cm × 1–3.5 mm, glabrous, abaxially sparsely glandular, base attenuate, margin entire or slightly revolute, apex obtuse, lateral veins inconspicuouse. Spike terminal, simple, 1–4 cm × 8–9 mm, subcapitate; flowers subsessile. Bracts and bracteoles purplish, lanceolate or linear, subequal as long as the corolla, pubescent, margin gray villous. Calyx campanulate, ca. 1 × 0.8 mm, 5-veined, 5-sulcate, pilose and glandular outside, glabrous inside; teeth 5, triangular, margin ciliate. Corolla reddish, ca. 2 times as long as the calyx, subequally 4-lobed. Stamens 4, much exserted; filaments inserted at a same height in the tube, bearded; anthers 1-locular, cell apex dehiscent; style ca. 3.5 mm long; stigma bifid, lobes unequal. Nutlets 4, ca. 0.7 × 0.4 mm, oblong, 4-angled, light brown.
Distribution and habitat:— The species is distributed in China, India, Thailand, and Vietnam. In China, it occurs in southern Yunnan ( Figure 16 View FIGURE 16 ). It grows occasionally in marshy grounds, at ponds, or near streams, at 800–1550 m elevation.
Phenology:— Flowering and fruiting from October to the following May.
Taxonomic notes:— Pogostemon pentagonus is similar to P. faurei in having small leaves, but differs from the latter by its calyx ca. 1.2 mm long (not longer than 2 mm), corolla ca. 2.5 mm long (not ca. 3.3 mm) and distributed in south Yunnan (not Heilongjiang).
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