Platostoma coloratum (D.Don) A.J.Paton

First published in Kew Bull. 52: 274 (1997)
This species is accepted
The native range of this species is Himalaya to China (Yunnan). It is a subshrub or shrub and grows primarily in the subtropical biome.

Descriptions

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

Type
Nepal, Hamilton s.n. (holotype BM!).
Morphology General Habit
Erect or ascending shrubs to 2 m tall, rootstocks woody
Morphology Stem
Stems quadrangular or round-quadrangular, often striate, puberulent, becoming denser on the inflorescence axis, old stems glabrous below
Morphology Leaves
Leaves subsessile or distinctly petiolate, thick or membranous, ovate or ovate-lanceolate, 20 - 120 x 15 - 60 mm, apex acute or acuminate, base cuneate, margin serrate or crenate, glabrous, glabrescent, scabrate or pubescent above, glabrous, glabrescent or pubescent with sessile glands beneath, glands minute; petioles obscure to 3 mm long
Morphology Reproductive morphology Inflorescences
Inflorescence terminal or axillary, simple or branched, 20 - 200 x 8 - 15 mm; verticils up to 15 mm apart; cymes with 2 short secund branches; bracts with 1 - 2 lower pairs leaf- like, with pale colour at base, upper bracts caducous, ovate to broadly ovate, 5 - 20 x 3 - 10 mm, acuminate, broadly cuneate at base, adaxial pubescent in upper half and subglabrous in lower half, abaxial densely pubescent with sessile glands, often forming a terminal coma on young inflorescence, each bract subtending 4 - 12 flowers; pedicels 1.5 - 2.5 mm long in flower, 3 - 4 mm long and pubescent in fruits
Morphology Reproductive morphology Flowers Calyx
Calyx campanulate, 1 - 3 mm long at anthesis; 3 - 8 mm long at fruiting; posterior lip 3-lobed, median lobe oblong, slightly curved backwards, sparsely puberulent both sides, lateral lobes obtuse, very short; anterior lip with 2-connate shortly oblong or subulate teeth, shortly acute or obtuse at apex, straight or slightly upcurved, shorter than posterior; tube pubescent with minute sessile glands outside, glabrous or thinly covered with minute glands inside, strongly pitted with secondary transverse veins, only slightly gibbous on anterior base
Morphology Reproductive morphology Flowers Corolla
Corolla white or purple, 5- 7 mm long; posterior lip 4-lobed, obtuse, the 2 middle lobes slightly smaller than the 2 outer lobes; anterior lip entire, concave, slightly longer than posterior; throat pubescent; tube 1.5 - 4 mm long, dilated towards throat, villous with minute sessile glands outside
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens exserted, rarely exceeding anterior corolla lobe, pubescent at base; anterior pair attached around the base of the anterior corolla lobe; posterior pair attached around the midpoint of corolla tube, inappendiculate
Morphology Reproductive morphology Flowers Gynoecium Ovary
Ovary glabrous below, papillose at apex
Morphology Reproductive morphology Flowers Gynoecium Style
Style exserted, shortly bifid, not exceeding anterior stamens
Morphology Reproductive morphology Flowers Disc
Disc lobed with the anterior side well developed
Morphology Reproductive morphology Fruits
Nutlets dark brown, oblong, 1 - 1.2 x 0.5 - 0.8 mm, minutely punctate, papillose at apex, not producing mucilage when wet.
[KBu]

Sources

  • Herbarium Catalogue Specimens

    • Digital Image © Board of Trustees, RBG Kew http://creativecommons.org/licenses/by/3.0/
  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Bulletin

    • Kew Bulletin
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2023. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0