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  Acacia nilotica ssp. indica
  Family: FABACEAE/LEGUMINOSAE (Subfam.: Mimosoideae)
  Citation:  Acacia nilotica (L.) Willd. ex Del. ssp. indica (Benth.) Brenan, Kew Bull. 12: 84. 1957; Vajr., Fl. Palghat Dist. 185. 1990; Sanjappa, Legumes Ind. 42. 1992; Chakrab. & Gangop., Journ. Econ. Tax. Bot. 20: 619. 1996; Sasidh., Fl. Chinnar WLS 118. 1999; Sunil & Sivadasan, Fl. Alappuzha Dist. 263. 2009; Ratheesh Narayanan, Fl. Stud. Wayanad Dist. 332. 2009. Mimosa nilotica L., Sp. Pl. 521. 1753. Acacia arabica Hook.f., Fl. Brit. India 2: 293. 1878, non (Lam.) Willd. 1808; Gamble, Fl. Pres. Madras 425(301). 1919. Acacia arabica Hook. f. var. indica Benth. in Hook.'s London J. Bot. 1: 500. 1842. Mimosa arabica Lam., Encycl. 1: 19. 1783.
  Malayalam Name(s): Karivelum, Karuvelakam, Babool
  Tamil name(s):
  English name(s): Babul tree, Black babool, Indian gum arabic tree
  Description: Trees, to 8 m high; bark black with deep narrow longitudinal fissures, running spirally up the tree, exudation gummy; blaze pinkish-brown; branchlets blackish or greyish, smooth, the young ones densely pubescent with short stiff patent hairs. Leaves bipinnate, alternate, stipulate; stipular spines in pairs, upto 5 cm, straight, slender, white with grey spots; rachis 5-7 cm, slender, pulvinate, grooved above, pubescent; pinnae 4-9 pairs, 1.5-3 cm, slender, with a gland near the lowermost pinnae on upper side, pubescent; leaflets 20-40, opposite, sessile; lamina 3-4 x 1-2 mm, linear, oblong or linear-oblong, base oblique, apex obtuse, margin entire, glabrous, chartaceous; midrib more or less central, lateral nerves obscure. Flowers bright yellow, in heads on axillary peduncle; involucre of 2 bracteoles near or above the mid peduncle; calyx campanulate, 1-2 x 0.8-1.5 mm, glabrescent, teeth triangular to ovate; corolla 2.5-3.5 mm long, often puberulous, lobes oblong to ovate; stamens many, 4.5-5 mm long, filaments basally connate; ovary terete, stipitate, puberulous; style 5.5-6.5 mm long. Fruit a pod 7.6-23 x 1.3-2 cm, flattened, strap-shaped, straight to slightly curved, deeply constricted between seeds, bullate over seeds, beaked at apex; densely grey-felted, glaucous, greyish-green, turning black on drying, attenuate at base into stipe, dehiscent; seeds 8-13, flat 5 x 4 mm, black.
  Habit: Tree
  Flowering & Fruiting: July-October
  District(s): Wayanad, Alappuzha, Idukki, Palakkad
  Medicinal: Yes
  Habitat: Introduced and planted
  Distribution: North India to North Africa through West Asia
  Aquatic: No
  Epiphyte(s): No
  Saprophyte: No
  Stem parasite: No
  Root parasite: No
  Flower colour(s): Yellow
  Weed: No
  Monocot/Dicot: Dicotyledonous Plants
  Exotic: Yes
  Garden: No
  Edible: No
  Vegetable: No
  Endemic to:
  IUCN status:
  Localities: Chinnar, Walayar, Kavalam
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