Mussaenda roxburghii?

[Tabish]

Found this plant growing by riverside in Pasighat, Arunachal Pradesh in May end.

I think this is Mussaenda roxburghii. Looking for confirmation or otherwise id suggestions.

  Best wishes

  Tabish

[Tabish]

More images..

[Tabish]

One more images

[Saroj Kasaju]

Mussaenda frondosa L. !

Thank you.

Saroj Kasaju

On Fri, Aug 12, 2022 at 10:58 PM Tabish <tab...@gmail.com> wrote:

One more images

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[Tabish]

 To my eye, the sepals of Mussaenda frondosa look  broader in comparison to my images, and also more hairiness of the plant. Also the buds of my plant look different from those of M. frondosa. The buds of my plant appear to agree with the M. roxburghii images on Flora of Bhutan site

  https://biodiversity.bt/species/show/6298

  https://biodiversity.bt/group/royal_manas_national_park/observation/show/5360

  Tabish 

On Friday, August 12, 2022 at 10:40:59 PM UTC+5:30 Tabish wrote:

[J.M. Garg]

I think the main difference appears to be in Calyx lobes:

For Mussaenda frondosa, it is 'Calyx with hypanthium portion ellipsoid, 3-4 mm, strigose to sericeous; lobes narrowly triangular to narrowly ligulate, 7-12 mm, hirsute, acute to acuminate' as per Flora of China.
For Mussaenda roxburghii, it is 'Calyx lobes filiform, tapering from base, 6-9mm x 1mm, densely covered in long silky hairs' as per Flora of Bhutan.

Let us see the detailed description to arrive at the right id: 

	Flora of Bhutan	Flora of China
	Mussaenda roxburghii Hook.f.: Much branched shrub 1-4.5m. stems glabrous or pilose with spreading hairs leaves petiolate usually elliptic, rarely ovate or oblong, 5-25 x 4-9cm, acuminate at both ends, subglabrous or thinly pilose above, thinly to densely pilose below, veins adpressed pilose on both surface; petioles 2-15mm; stipules broadly triangular, 6-10mm. Inflorescence a dense terminal head, usually 3 branched from base, but differentiated, many flowered. Calyx lobes filiform, tapering from base, 6-9mm x 1mm, densely covered in long silky hairs. Corolla tube 2.4-2.8cm, densely covered in long silky hairs. lobes narrowly ovate, 4-8 x 2-2.5mm, terminating in a long fine hairpoint. Berry globose, 6-10mm, glabrous calyx persistent until fruit is ripe.	Mussaenda frondosa Linnaeus: Climbing shrubs; branches terete to compressed, moderately to densely pale red sericeous to hirsute becoming glabrescent, red-brown or brown, rather densely lenticellate. Leaves opposite; petiole 4-10 mm, densely sericeous; blade drying thinly papery or leathery, adaxially dark green to brownish green, abaxially pale green to yellowed, broadly elliptic, elliptic-oblong, ovate, or oblanceolate, 8-15 × 3-8 cm, both surfaces sparsely strigillose on lamina and strigose to sericeous on principal veins, base acute, obtuse, or rounded, apex acute to caudate-acuminate; secondary veins 7-10 pairs, tertiary venation visible and reticulate; stipules persistent, triangular, 5-10 mm, densely strigose to pilose, deeply 2-lobed, lobes lanceolate to narrowly triangular, acute to acuminate. Inflorescences congested-cymose becoming lax with lateral axes elongating markedly, 4-8 × 8-20 cm with lateral axes to 8 cm, sparsely to moderately pubescent with 2 types of pubescence, mixed strigillose to appressed puberulent and hirsute to villous, pedunculate or sessile and 3-partite; peduncles 1-3 cm; bracts triangular or elliptic, 4-10 mm, usually 2- to multifid, acute to acuminate; pedicels 1-6 mm. Flowers pedicellate, biology not noted. Calyx with hypanthium portion ellipsoid, 3-4 mm, strigose to sericeous; lobes narrowly triangular to narrowly ligulate, 7-12 mm, hirsute, acute to acuminate, with 1 lobe of 1-4 flowers per inflorescence sometimes expanded into calycophyll, blade elliptic-oblong to ovate, 6-8 × 2.5-5 cm, both surfaces glabrescent on lamina and strigillose on principal veins, base acute to cuneate, stipe 10-30 mm, apex acute or acuminate. Corolla salverform, outside hirsute; tube 22-25 mm; lobes ovate, 6-7 mm, acuminate. Berry ovoid or ellipsoid, ca. 10 × 7 mm, strigose to glabrescent, calyx limb deciduous. Fl. Apr-May.

After going through the descriptions, I feel it may be Mussaenda roxburghii Hook.f. only.

The following posts may also be of Mussaenda roxburghii Hook.f..:
Mussaenda sp. for ID 
Mussaenda frondosa?
Mussaenda glabrata (Hook.f.) Hutch. ex Gamble from Assam KD 02 Jul’ 2017 
MS July, 2017/06 Mussaenda sp. for Id 
MS, June,2021/20 Mussaenda sp. for id.

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With regards,
J.M.Garg

[J.M. Garg]

Got a description from IBP also. Including that:

		Flora of China
	Mussaenda roxburghii Hook.f.: Flora of Bhutan

Much branched shrub 1-4.5m. stems glabrous or pilose with spreading hairs leaves petiolate usually elliptic, rarely ovate or oblong, 5-25 x 4-9cm, acuminate at both ends, subglabrous or thinly pilose above, thinly to densely pilose below, veins adpressed pilose on both surface; petioles 2-15mm; stipules broadly triangular, 6-10mm. Inflorescence a dense terminal head, usually 3 branched from base, but differentiated, many flowered. Calyx lobes filiform, tapering from base, 6-9mm x 1mm, densely covered in long silky hairs. Corolla tube 2.4-2.8cm, densely covered in long silky hairs. lobes narrowly ovate, 4-8 x 2-2.5mm, terminating in a long fine hairpoint. Berry globose, 6-10mm, glabrous calyx persistent until fruit is ripe.

From IBP: Shrubs, up to 8 m tall; branchlets striate, angular, greenish, densely pubescent. Leaves simple, opposite decussate; stipules ca. 0.5-2 x 0.4-0.8 cm, triangular, acuminate; petioles ca. 0.5-1.5 cm long, densely hairy; lamina ca. 5-20 x 3-9 cm, oblong-lanceolate, acute to acuminate at base, acuminate at apex, entire, pubescent underneath; secondary nerves 6-12 pairs. Flowers white, ca. 0.4-0.6 cm across in terminal subcapitate cymes; peduncles pubescent; bracts ovate, ca. 0.8 x 0.3 cm, acuminate; clayx lobes filiform, ca. 0.6-1 x 0.1-0.2 cm; petaloid sepals oblong-lanceolate, ca. 4-10 x 2.5 cm with 1-4 cm long stalk; corolla-lobes ovate, ca. 0.2-0.1 cm, acuminate. Berries subglobose, ca. 1.8 cm in diam., sparsely appressed pubescent. Seeds ellipsoid or globose, reticulate.

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With regards,
J.M.Garg

[Tabish]

Thanks Garg ji,

  I also think the plants in the other two posts referred to by you are Mussaenda roxburghii.

  Tabish

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[J.M. Garg]

Thanks, Tabish ji

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With regards,
J. M. Garg