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This species is accepted, and its native range is Thailand.

[KBu]

Suddee, S., A. J. Paton, & Parnell, J. (2005). Taxonomic Revision of Tribe Ocimeae Dumort. (Lamiaceae) in Continental South East Asia III. Ociminae. Kew Bulletin, 60(1), 3-75. Retrieved from http://www.jstor.org/stable/4110885

Conservation
Known from 5 localities all within protected areas. Decline is unlikely, although some localities may be affected by increasing tourism in the future. Estimated extent of occurrence is less than 200 km2. Near Threatened.
Distribution
Endemic to Thailand.
Ecology
In mixed deciduous forest, moist and shaded areas by streams in evergreen forest; 700 - 950 m.
Morphology General Habit
Shrub to 2 m tall, indumentum of white soft hairs
Morphology Leaves
Leaves subsessile on upper leaves, petiolate on lower leaves, membranous, ovate, 50 - 140 x 25 - 60 mm, apex acute or acuminate, base rounded or shortly cuneate, margin coarsely serrate, softly pubescent with black sessile glands on both sides; petioles up to 3 cm long on lower leaves, pubescent with black sessile glands
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens exserted, anterior pair twice as long as anterior corolla lip
Morphology Reproductive morphology Flowers Calyx
Calyx 2 - 3 mm long at anthesis, 8 - 9 mm long in fruit; posterior lip orbicular, rounded or apiculate at apex, margin ciliate, strongly reflexed in fruit, pubescent on both sides at anthesis, pubescent inside and glabrous outside in fruit; anterior lip with median teeth subulate, slightly longer than posterior, lateral teeth cuspidate, ciliate, much shorter than median teeth; tube pubescent with black sessile glands outside, these later prominent at tube base, glabrescent to pubescent on posterior side inside; nerves prominent
Morphology Reproductive morphology Flowers Corolla
Corolla purple, 14 - 17 mm long; posterior lip 3-lobed, median lobe smaller, slightly emarginate; anterior lip concave, ± equal to the posterior; lobes pubescent with black sessile glands at back; tube cylindric, straight, 10 - 12 mm long, pubescent with scattered black sessile glands
Morphology Reproductive morphology Flowers Disc
Disc with anterior side well- developed, obtuse at apex, ± equal to and not exceeding ovary
Morphology Reproductive morphology Flowers Gynoecium Style
Style far exserted, much exceeding anterior stamens, capitate-clavate and slightly cleft at apex
Morphology Reproductive morphology Fruits
Nutlets ovoid or ellipsoid, 1.5 - 2 mm long, reticulate, producing mucilage when wet.
Morphology Reproductive morphology Inflorescences
Inflorescence terminal, up to 20 cm long; axis pubescent with scattered black sessile glands; bracts grading into leaves, sessile, subtending 3 flowers, forming a small apical coma, persistent, lanceolate, up to 4 mm long, longer than the pedicel in flower, shorter or equal to the pedicel in fruit, acuminate, margin long ciliate, adaxial glabrous, abaxial pubescent with black sessile glands; pedicels 1.5 - 3 mm in flower, 4 mm in fruit
Morphology Stem
Stems slender, woody at base, round-quadrangular, pubescent
Note
This species differs from Orthosiphon aristatus in its white, soft indumentum, and in the conspicuous black sessile glands on both vegetative and reproductive parts. The corolla is similar to that of O. aristatus but the median lobe of the posterior lip is smaller.
Phenology
Flowering and fruiting August - October.
Type
Chiang Mai, Sa meung, 700 m, 19 Oct. 1922, Kerr 6388 (holotypus BM!; isotypi 3 shts. BM!, SING!).

Native to:

Thailand

Orthosiphon pseudoaristatus Suddee appears in other Kew resources:

First published in Kew Bull. 60: 21 (2005)

Accepted by

  • Govaerts, R.H.A. (2011). World checklist of selected plant families published update Facilitated by the Trustees of the Royal Botanic Gardens, Kew.

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Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2021. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0