Siphocranion macranthum (Hook.f.) C.Y.Wu

First published in Acta Phytotax. Sin. 8: 56 (1959)
This species is accepted
The native range of this species is E. Himalaya to S. China. It is a perennial and grows primarily in the subtropical biome.


Extinction risk predictions for the world's flowering plants to support their conservation (2024). Bachman, S.P., Brown, M.J.M., Leão, T.C.C., Lughadha, E.N., Walker, B.E.

Predicted extinction risk: not threatened. Confidence: confident

Suddee, S., A. J. Paton, & Parnell, J. (2004). A Taxonomic Revision of Tribe Ocimeae Dumort. (Lamiaceae) in Continental South East Asia I. Introduction, Hyptidinae & Hanceolinae. Kew Bulletin, 59(3), 337-378. doi:10.2307/4110949

India, Khasia Mts, 1500 - 1800 m, Hooker & Thomson s.n. (K! lectotype chosen here; isolectotypes 3 shts. K!).
Morphology General Habit
Erect or ascending herb up to 1 m tall
Morphology Stem
Stems quadrangular, pubescent, branched
Morphology Leaves
Leaves membranous, ovate, 30 - 110 x 15 - 70 mm, apex acute or acuminate, base cuneate or obtuse, margin serrate, sparsely pubescent with scattered multicellular hairs and sessile glands on both sides, glands prominent beneath; petioles 5 - 15 mm long, pubescent
Morphology Reproductive morphology Inflorescences
Inflorescence terminal, up to 20 cm long; axis pubescent with gland-tipped hairs; bracts sessile, subtending 1 (2 - 3) flowers, forming an apical coma, persistent, ovate or lanceolate, to 5 mm long, shorter than pedicel in flower and fruit, adaxial glabrous, abaxial puberulous or pubescent, margin ciliate; bracteoles if present small, c. 1 mm long; pedicels 4 - 5 mm long in flower, 6 - 7 mm long in fruit, pubescent with gland-tipped hairs
Morphology Reproductive morphology Flowers Calyx
Calyx broadly campanulate, 4- 5 mm long at anthesis, 10 - 12 mm long in fruit with conspicuous nerves; posterior lip 3- lobed with subequal pointed teeth; sinus between teeth truncate, broad, glabrous on inner side, pubescent outside, membranous; anterior lip 2-lobed, subulate-lanceolate, connate for more than half their length, shorter than posterior in flower, longer in fruit; sinus between posterior and anterior lip deep and wide; tube short, 3 mm long in fruit, 13-nerved, pubescent to puberulous with simple and gland- tipped hairs outside
Morphology Reproductive morphology Flowers Corolla
Corolla pinkish-blue, 20 - 25 mm long; posterior lip subequally 4-lobed, 4- 8 mm long; anterior lip concave, ± equal to posterior in length; lobes sometimes with scattered sessile glands on back; tube 14 - 20 mm long, straight or slightly curved below the middle, glabrous or puberulous outside, gradually dilated towards throat
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens included, all inserted on corolla throat at the same level, anterior inserted at base of anterior corolla lobe, posterior pair inserted at base of lateral lobes of posterior corolla lip, anterior only slightly longer
Morphology Reproductive morphology Flowers Gynoecium Style
Style deeply bifid at apex, ± equal to stamens
Morphology Reproductive morphology Flowers Disc
Disc with anterior side well-developed, not exceeding ovary
Morphology Reproductive morphology Fruits
Nutlets brown, oblong, 2.5 mm long, smooth or minutely puberulous with 2 - 3 longitudinal lines, not producing mucilage when wet.
Open or shade areas in bamboo forest, deciduous forest, evergreen forest, stream banks; 300 - 2550 m.
Flowering & fruiting July - February.
India, South China, Burma & North Vietnam.
Burmese: Myo-Ma.
The type of Plectranthus mairei H. Lev. is actually Isodon coetsa. All of the syntypes of Plectranthus macranthus are more or less in the same state. The lectotype is chosen from Hooker & Thomson s.n.; this collection exists as several duplicates.


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