Botanical Survey of India | Flora of India

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Goniothalamus (Blume) Hook. f. & Thomson

Shrubs or small trees. Leaves coriaceous, with prominent nerves forming intramarginal loops. Flowers solitary or few in fascicles, axillary or extra-axillary or sometimes cauliflorous; pedicels with basal scaly distichous bracts. Sepals 3, valvate, several-nerved, free or cup-shaped, often persistent in fruit. Petals 6 (3 + 3), valvate, coriaceous; outer petals erect, flat; inner ones smaller, shortly and broadly clawed at base, with upper part broadened and cohering in a narrow conical vaulted cap over the stamens and carpels. Stamens many, linear-oblong; anther-thecae remote, dorsal; pollen grains large; connectives produced into oblong or truncate processes. Carpels many, cylindrical; style linear; stigma simple or bifid; ovule solitary or 2, superposed, subbasal. Ripe carpels subsessile. Seed 1, sometimes 2 - 4.

India, Sri Lanka, Bangladesh, Bhutan, Myanmar, Thailand, Cambodia, Malaysia, Indonesia, Philippines, New Guinea and Pacific Islands; ca 115 species, 10 species in India.

Literature. NGUYEN, Tien Ban (1974) On the taxonomy of the genus Goniothalamus (Bl.) Hook. f. & Thoms. I & II. Bot. Zhumal URSS.59: 547 - 555 & 660 - 672.


1a. Ripe carpels distinctly ridged when dry 4. Goniothalamus meeboldii
b. Ripe carpels not ridged 2
2a. Connectives of stamens apiculate at top 3
b. Connectives of stamens flat or convex at top 7
3a. Outer petals linear-laneeolate, 6 - 11 cm long 2. Goniothalamus macranthus
b. Outcr petals ovate, ovate-lanceolate or oblong-lanceolate, less than 8 cm long 4
4a. Outer petals ovate-lanceolate, 3 - 8 cm long 3. Goniothalamus malayanus
b. Outer petals ovate or oblong-lanceolate, 4 cm or less long 5
5a. Stigma entire 5. Goniothalamus rhynchantherus
b. Stigma bifid 6
6a. Outer petals broadly ovate, ca 2 cm long 10. Goniothalamus wynaadensis
b. Outer petals oblong-lanceolate, 3 - 4 cm long 7. Goniothalamus simonsii
7a. Outer petals 3 - 3.5 cm long 8. Goniothalamus thwaitesii
b. Outer petals not more than 3 cm long 8
8a. Leaves 25 cm or longer 6. Goniothalamus sesquipedalis
b. Leaves below 25 cm long 9
9a. Leaves oblong-lanceolate; ripe carpels shortly stalked 1. Goniothalamus cardiopetalus
b. Leaves lanceolate; ripe carpels almost sessile 9. Goniothalamus wightii

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