Hibiscus for ID-GS24032021-1: 3 images.
Please help with the ID of this Hibiscus species, cultivated small shrub with almost rounded leaves with entire margin, flowers with short staminal column. 
Photographed from HSR Layout area, Bangalore, 16-9-2015.


Hibiscus rosa-sinensis  ?


leaves are different, staminal tube shorter and most important leaves are almost entire, epicalyx fewer.


For me it looks … is correct as there are innumerable varieties and cultivars available
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Sorry friends you may ignore membranous toothed leaves of H. rosa-sinensis (vs thick entire leaves of my plant), linear 6-9 epicalyx in H. rosa-sinensis (vs 5-7 triangular-lanceolate in my plant). I would go with cultivar of H. arnottianus (or H. denisonii, which is of course an ambiguous name), which is almost as widely cultivated as H. rosa-sinensis.
I am sharing more pictures to make things more clear.


Hibiscus arnottianus A.Gray
Hibiscus arnottianus A.Gray


I am sharing Hibiscus Key from Bailey Manual of Cultivated Plants:
a. Plant a low diffuse spreading hairy annual. (Trionum.) \. H. Trionum
aa. Plant strong and erect.
    b Species of annuals and herbaceous perennials.
         c. Calyx large and spathe-like, splitting down one side, usually early deciduous. (Abelmoschus.)
               d. Bractlets of involucel linear.
                     e. Pod 3 in. or less long 2. H. Abelmoschus
                     ee. Pod 4-5 in. or more long 3. H. esculentus
              dd. Bractlets ovate to oblong 4. H. Manihot
         cc. Calyx regularly 5-lobed or -cleft, not spathe-like.
              d. Involucel and calyx red, thick and fleshy, edible 5. H. Sabdanfla
              dd. Involucel and calyx not so.
                      e. Sts. not prickly.
                            f. Foliage nearly or quite glabrous.
                                  g. Lvs. divided into narrow divisions 6. if . coccmeus
                                  gg. Lvs. hastate with short lobe on either side at base, or not lobed 7. H. mihtans
                           ff. Foliage prominently pubescent or tomentose, at least underneath.
                                   g. Lobes of calyx usually abruptly pointed: fls. rose 8. H. Moscheutos
                                   gg. Lobes long-acuminate: fls. white with rose center 9. H. oculiroseus ee. Sts. prickly 10. H. cannabmus
  bb. Species of shrubs and small trees.
        c. Involucel of separate bractlets.
            d. Fls. yellow U- # calyanus
            dd. F]s. white, pink, red. , <fl „ , . , „
                  e. Lvs. linear or lanceolate, or parted into lobes of such shape. . . 12. H. heterophyllous
                  ee. Lvs. broad
                        f. Petals deeply cut and fringed 13. H. schizopetalus
                        ff. Petals not lobed or only shallowly emarginate.
                              g. Margins of lvs. entire 14. H. Arnottianus
                              gg. Margins dentate or lobed, or both.
                                    h. Staminal column long-exserted 15. H. Rosa-sinensis •
                                    hh. Staminal column not surpassing the corolla.
                                           i. With pubescent lvs 16. H. mutabilis
                                           ii. With glabrous lvs 17. H. syriacus
        cc. Involucel an 8-10-toothed cup: fls. yellow. (Paritium, Pariti.)
                d. With deciduous involucel and calyx 18. H. elatus
                dd. With persistent involucel and calyx 19. H. tiliaceous

Hibiscus key with slight correction

a. Plant a low diffuse spreading hairy annual. (Trionum.)……………………………………………1.  H. Trionum
aa. Plant strong and erect.
    b Species of annuals and herbaceous perennials.
         c. Calyx large and spathe-like, splitting down one side, usually early deciduous. (Abelmoschus.)
               d. Bractlets of involucel linear.
                     e. Pod 3 in. or less long …………………………………………………………………….2. H. Abelmoschus
                     ee. Pod 4-5 in. or more long……………………………………………………………… 3. H. esculentus
              dd. Bractlets ovate to oblong …………………………………………………………………….4. H. Manihot
         cc. Calyx regularly 5-lobed or -cleft, not spathe-like.
              d. Involucel and calyx red, thick and fleshy, edible ………………………………………..5. H. Sabdanfla
              dd. Involucel and calyx not so.
                      e. Sts. not prickly.
                            f. Foliage nearly or quite glabrous.
                                  g. Lvs. divided into narrow divisions ……………………………………………6. H . coccmeus
                                  gg. Lvs. hastate with short lobe on either side at base, or not lobed …7. H. mihtans
                           ff. Foliage prominently pubescent or tomentose, at least underneath.
                                   g. Lobes of calyx usually abruptly pointed: fls. rose …..8. H. Moscheutos
                                   gg. Lobes long-acuminate: fls. white with rose center ..9. H. oculiroseus
                    ee. Sts. prickly …………………………………………………………………..10. H. cannabmus
  bb. Species of shrubs and small trees.
        c. Involucel of separate bractlets.
            d. Fls. yellow ……………………………………………………………………………11. H calyanus
            dd. F]s. white, pink, red.
                  e. Lvs. linear or lanceolate, or parted into lobes of such shape. . . 12. H. heterophyllous
                  ee. Lvs. broad
                        f. Petals deeply cut and fringed …………………………………………..13. H. schizopetalus
                        ff. Petals not lobed or only shallowly emarginate.
                              g. Margins of lvs. entire …………………………………………………14. H. Arnottianus
                              gg. Margins dentate or lobed, or both.
                                    h. Staminal column long-exserted ………………………………15. H. Rosa-sinensis •
                                    hh. Staminal column not surpassing the corolla.
                                           i. With pubescent lvs………………………………………….. 16. H. mutabilis
                                           ii. With glabrous lvs ……………………………………………..17. H. syriacus
        cc. Involucel an 8-10-toothed cup: fls. yellow. (Paritium, Pariti.)
                d. With deciduous involucel and calyx ……………………………………………..18. H. elatus
                dd. With persistent involucel and calyx …………………………………………….19. H. tiliaceous


To me also looks different from Hibiscus arnottianus as per


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