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Pakistan | Family List | Rubiaceae

26. Ixora *L., Sp. PI. 110. 1753. Gen. Pl. ed. 5.48. 1754; Benth. & Hook. f., Gen. P1. 2: 113. 1873; Hook. f., Fl. Brit. Ind. 3: 137. 1880; Cooke, Fl. Pres. Bomb. 2: 609. 1902; Parker, For. Fl. Punj. ed. 2.290. 1924; Bailey, Stand. Cycl. Hort. 1: 1710. 1950; Bor & Raizada, Beaut. Ind. Climb. Sh. & Tr. 85. 1954; Dwyer in Woodson & Schery, Fl. Panama, in Ann. Miss. Eat. Gard. 67(2): 257. 1980.

S. NAZIMUDDIN AND M. QAISER

Evergreen shrubs or small trees. Leaves opposite on rarely 3-whorled, generally glabrous and coriaceous; stipules interpetiolar. Inflorescence terminal on leafless lateral shoots or sometimes cauliflorous corymbose cymes, trichotomously branched. Flowers generally pedicellate, bracteate and 2 bracteolate, 4-merous, very rarely pentamerous, generally white, red or pink, mostly fragrant. Calyx-tube ovoid, lobes short, 4(-5), persistent. Corolla salver-shaped; tube long, very slender, terete, always longer than lobes, throat naked or bearded; lobes 4-(5), spreading, twisted in bud. Stamens 4(-5), inserted on throat or mouth of the corolla; filaments very short or absent. Disc thick or swollen. Ovary 2-locular; style filiform, branches 2, shortly exserted, diverging or recurved, rarely persistently connate. Ovules solitary, peltately attached to the septum in each locule. Fruit drupaceous, globose or didymous with persistent calyx, pyrenes 2, coriaceous. Seeds peltate, testa membranous, albumen hard.

A large genus of about 400 species, distributed mainly in the tropics. Represented in Pakistan by 6 cultivated species.


1 Flowers white. Leaves distinctly petiolate   (2)
+ Flowers pink or orange to red. Leaves subsessile or shortly petiolate   (4)
       
2 (1) Corolla-tube 20-25 mm long. Branches of inflorescence hairy. Calyx-lobes longer and broader than calyx tube   2 Ixora polyantha
+ Corolla-tube 8-12 mm long. Branches of inflorescence glabrous. Calyx-lobes equalling or shorter than calyx-tube   (3)
       
3 (2) Style densely pubescent. Calyx-teeth minute, shorter than the tube. Leaves almost rounded at the base, margin not undulate   3 Ixora pavetta
+ Style glabrous. Calyx-teeth equalling the tube. Leaves acute at the base, margin undulate   5 Ixora undulata
       
4 (1) Leaves pubescent beneath. Corolla-tube 1.5-2 cm long; lobes obtuse to rounded. Flowers mostly pink   6 Ixora chinensis
+ Leaves glabrous. Corolla-tube 2.5-4.5 cm long; lobes acute to acuminate. Flowers scarlet or orange-scarlet   (5)
       
5 (4) Leaves shortly petiolate, acute with 10-12 main pairs of lateral nerves   4 Ixora fulgens
+ Leaves sessile, obtuse or mucronate with ± 8 pairs of lateral nerves   1 Ixora coccinea

Lower Taxa

Related Synonym(s):


 

Related Objects  

A Catalogue of the Vascular Plants of Madagascar  
  • Synoptic key to the long-tubed Malagasy Ixora species (corolla tube < 15 cm) (based on De Block, 2007)
  • Web Page
    Flora of China  
  • Ixora (PDF)
  • PDF

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