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  Dipterocarpus bourdillonii
  Citation:  Dipterocarpus bourdillonii Brandis in Hook., Ic. Pl. t. 25. 1895; Gamble, Fl. Pres. Madras 81(58). 1915; K.P. Janardh. in B.D. Sharma & Sanjappa, Fl. India 3: 210. 1993; Subram., Fl. Thenmala Div. 27. 1995; Sasidh., Fl. Periyar Tiger Reserve 27. 1998; Anil Kumar et al., Fl. Pathanamthitta 74. 2005; K.P. Janardh. & W. Arisdason in P. Daniel, Fl. Kerala 1: 360. 2005.
  Malayalam Name(s): Chiratta-anjili, Kalpayin, Karanjili
  Tamil name(s):
  English name(s):
  Description: Evergreen trees, to 40 m high, bark grey; young parts covered with dense brown tomentum. Leaves simple, alternate, 20-45 x 12-25 cm, obovate, ovate or ovate-oblong, base obtuse, apex acute or acuminate, round or subcordate, margin entire or wavy, coriaceous, glabrous above and stellate hairy beneath; lateral nerves 12-15 pairs, parallel, prominent, intercostae scalariform, faint; petiole 38-55 mm long, swollen tipped, tomentose, stout; stipules large, lateral, amplexicaul, leaving an annular scar. Flowers bisexual, white, 4-5 x 3.7 cm, 3-5 in short axillary racemes. Calyx tubular, obconical; lobes 5, linear. Petals 5, 3.5-5 cm long, pubescent, valvate. Stamens 30; filaments of variable length, broad, compressed, connate at base, tapering gradually and filiform below the anther; anthers hastate, locules subequal; connective nearly as long as the anthers, produced above. Ovary superior, 3-celled, ovules 2 in each cell; style filiform, pubescent. Fruit a nut, 2.5 cm across, globose, enclosed at the base of thickened, accrescent calyx lobes, subacute, very tuberculate below; calyx tube 5-angular, wings 5, purplish-brown.
  Habit: Tree
  Flowering & Fruiting: January-June
  District(s): Palakkad, Idukki, Pathanamthitta, Kollam, Kannur
  Habitat: Evergreen forests
  Distribution: Western Ghats
  Aquatic: No
  Epiphyte(s): No
  Saprophyte: No
  Stem parasite: No
  Root parasite: No
  Flower colour(s): White, Pink
  Weed: No
  Monocot/Dicot: Dicotyledonous Plants
  Exotic: No
  Garden: No
  Edible: No
  Vegetable: No
  Endemic to: Western Ghats
  IUCN status: Critically Endangered (CR)
  Localities: Koruthode, Pampa, Thenmalai
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