Hydnocarpus macrocarpus (Bedd.) Warb., in H.G.A.Engler & K.A.E.Prantl, Nat. Pflanzenfam. 3(6a): 21 (1893) (syn: Asteriastigma macrocarpum Bedd. ; Hydnocarpus macrocarpus subsp. burmanicus Sleumer ; Hydnocarpus macrocarpus subsp. malabaricus Sleumer; Taraktogenos macrocarpa (Bedd.) N.P.Balakr.);
SW. India, Indo-China: India, Myanmar, Thailand, Vietnam as per POWO;

Habit: Trees up to 15 m tall.
Branches and Branchlets: Young branchlets terete, minutely pubescent.
Leaves: Leaves simple, alternate, distichous; stipules caducous; petiole 1.2-2 cm long, swollen at apex, pubescent, lamina 17-30 x 6-10 cm, oblong, apex abruptly caudate-acuminate, base acute and asymmetric, margin entire, coriaceous, minutely pubescent on midrib beneath; midrib raised above; secondary nerves 6-8 pairs, obliquely ascending towards apex; tertiary nerves closely and horizontally percurrent.
Inflorescence / Flower: Flowers in fascicles on short peduncles on older branches, white; stamens many.
Fruit and Seed: Berry, woody, globose, to 15 cm across, dark brown tomentose; seeds numerous, angular.
Rare understorey trees in low and medium elevation wet evergreen forests up to 1000 m.
Endemic to the Western Ghats- South Sahyadri.
(Attributions: B. R. Ramesh, N. Ayyappan, Pierre Grard, Juliana Prosperi, S. Aravajy, Jean Pierre Pascal, The Biotik Team, French Institute of Pondicherry as per India Biodiversity Portal)

531 ID wild tree:
Please ID wild tree,
Location: bloomed near Vannappuram Thodupuzha Idukki Kerala INDIA
Altitude: 1500fsl
Flower date: 03FEB2024, 02.50pm
Habitat: wild moisture rocky streamside evergreen misty sloppy canopied alpine
Plant habit: tree, erect branches, branchlets, hard woody cylindrical stem 60 inches base circumference, rough brownish flaky bark
Height: 20 meters
Leaves: alternate elongate acute simple glossy wavy, size upto: 17×8cm
Flower: axillary spike inflorescence, diameter:13mm, greenish white, good fragrance
Camera: CANON EOS1500D +FL10x

Just wondering, could this be Hydnocarpus macrocarpus (Bedd.) Warb. (Achariaceae)? The species name is spelt as macrocarpa in some sources.

Yes, it is Hydnocarpus macrocarpus …, some of the fruits having the size of Couroupita guianensis fruit Cannonball. Sharing fruit image. Thank you very much for ID my tree.
1 image.

Does this fruit belong to the same individual tree bearing the flowers in your first set of images? It would have to be last year’s fruit.
This is an important find of an uncommon species that has been assessed as Vulnerable to Endangered. Your description of the “streamside” habitat fits quite well.

Thank you very much for your message. The fruit image is of an another individual and the same isn’t posted earlier of doubting.
Good population here, some with only fruits, some started to blooming but haven’t matured or immature fruits, some yet haven’t flowers neither fruits.
Here it is wet biome and growing not only in streamside, but seems everywhere.  Rarely, some small trees also flowering, but number of flowers are very low.
There was a strange flower smelling in surroundings of the tree and fallen flower collected as specimen.

Your first set of close-ups is of the male flower with what appears to be a short, aborted pistil. Do look out for the female / bisexual flower with the lobed stigmas.







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