Dimorphocalyx

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Dimorphocalyx balakrishnanii Chakrab. & Premanath

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Dimorphocalyx kurnoolensis R.Venkatar. & Pullaiet (India: Dry deciduous forests, along sides of streams. Rare. Andhra Pradesh (Kurnool Dist.) as per BSI Flora of India)
  

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Keys as per BSI Flora of India:

1 a. Plants monoecious; inflorescences bisexual (endemic to Andaman Islands)

1. Dimorphocalyx balakrishnanii

b. Plants mostly dioecious (occasionally monoecious); inflorescences unisexual (occurring in South India and Sri Lanka)

2

2 a. Inflorescences somewhat dichasial; stamens 8; ovary glabrous; styles 2 – 3 mm long, free; fruits glabrous

2. Dimorphocalyx beddomei

b. Inflorescences not dichasial; stamens 10 – 16; ovary pubescent; styles 3 – 7 mm long, connate below into a column; fruits evanescently pubescent

3

3 a. Branchlets, petioles, peduncles and pedicels glabrous; leaves elliptic to lanceolate, rounded, obtuse to acute at base, acuminate at apex; female pedicels 3 – 10 mm long; sepals glabrous; stamens 10 – 16, filaments of outer stamens free almost up to base

3. Dimorphocalyx glabellus

b. Branchlets, petioles, peduncles and pedicels pubescent; leaves obovate to oblanceolate, attenuate at base, obtuse to subacute at apex; female pedicels up to 2 mm long; sepals appressed-pilose; stamens 16 – 20, filaments of outer stamens shortly connate at base, free above

4. Dimorphocalyx kurnoolensis

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Species as per Flora of India Vol 23 (Editors N. P. Balakrishnan, T. Chakrabarty, M. Sanjappa, P. Lakshminarsimhan & P. Singh- by Botanical Survey of India (2012)):
Dimorphocalyx balakrishnanii Chakrab. & Premanath (India: Inland evergreen forests or coastal forests on sandy soil at low altitudes. South Andaman Islands; Endemic) (syn. of Tritaxis balakrishnanii (Chakrab. & Premanath) R.Y.Yu & Welzen as per POWO)
Dimorphocalyx beddomei (Benth.) Airy Shaw  (India: Evergreen forests of southern Western Ghats, at 850 – 1000 m altitudes. Kerala and Tamil Nadu; Endemic) (syn. of Tritaxis beddomei Benth. as per POWO)
Dimorphocalyx glabellus Thwaites (
var. glabellus (India: Evergreen forests, up to 900 m altitude. Scarce. Orissa, Andhra Pradesh, Maharashtra, Karnataka, Kerala and Tamil Nadu; Sri Lanka) (syn. of Tritaxis glabella (Thwaites) R.Y.Yu & Welzen as per POWO)
var. lawianus (Hook.f.) Chakrab. & N.P.Balakr. (India: Evergreen forests, at 150 – 1100 m altitudes. Scarce. Maharashtra, Karnataka, Kerala and Tamil Nadu; Endemic) (syn. of Tritaxis glabella var. praetervisa Chakrab. & G.Krishna as per POWO)
Dimorphocalyx kurnoolensis R.Venkatar. & T.Pullaiah (India: Dry deciduous forests, along sides of streams. Rare. Andhra Pradesh (Kurnool Dist.); Endemic) (syn. of Tritaxis kurnoolensis (R.R.V.Raju & Pull.) R.Y.Yu & Welzen as per POWO)

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Genus Dimorphocalyx Thw. (Euphorbiaceae) in India by T Chakrabarty, N P Balakrishnan Proceedings: Plant Sciences October 1990, Volume 100, Issue 5, pp 285-299 –
Abstract : A revision of the genus Dimorphocalyx Thw. (Euphorbiaceae) for India and adjoining countries is presented. Three species and two varieties are recognised. Dimorphocalyx beddomei (Benth.) Airy Shaw is endemic to south India. Dimorphocalyx lawianus Hook. f., endemic to south India is reduced to a variety of Dimorphocalyx glabellus Thw. Dimorphocalyx dilipianus Balakr. and T Chakrab. is reduced to a synonym of Dimorphocalyx balakrishnanii T Chakrab. and Premanath, endemic to Andaman Islands. Keys to the taxa, taxonomic descriptions and illustrations are presented.

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The genus Dimorphocalyx Thwaites in now Tritaxis Baill. (Euphorbiaceae) : 2 posts by 2 authors. Attachments (1)- tax.12135- compressed.pdf
Please look at the attached free access publication. There are four species and two varieties of Tritaxis in India.

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