Morinda citrifolia

As per efi thread:
Sharing some photographs of the buds and the flowers of Morinda coreia var. tomentosa. The flowers are usually 5-merous; have also attached some instances of variable merosity in the flowers of this tree (4-merous & 6-merous). The corolla tube is glabrous on the inside and hairy on the outer surface as seen in the last picture.
This tree is often referred to as Morinda pubescens Sm. The genus Morinda in Mumbai was revised by RR Fernandez who published a new combination – Morinda coreia Buch.-Ham. var. tomentosa (Hook.f.) R.R.Fernandez. Have attached the key by Fernandez from his book ‘Trees of Mumbai (Bombay)’, pp. 173-174, Scientific Publishers, 1999.
In Cooke’s Flora, the anthers are said to be included within the corolla tube as depicted in Navendu ji’s photographs on flowersofindia.net. But the anthers are clearly exserted in the trees that I have come across in Madh. In the eflora archives, I found some photographs of the flowers of M. pubescens bearing exserted stamens & anthers (posted by Mohina ji fr. Alibag & Dinesh ji fr. SGNP in Mumbai). The flower image of M. pubescens in ‘The Trees of Mumbai’ by M. Almeida & N. Chaturvedi (p. 20) as well as in Shrikant ji’s ‘Trees of Pune’ (p. 98) also depicts exserted anthers.
Brandis in his book Indian Trees refers to it by the old name Morinda tinctoria, Roxb. He says: “anthers exserted or included”
Talbot says the same: “Anthers exserted or included” in his Forest Flora of Bombay Presidency and Sind.
From what I’ve noticed, the style/stigma is exserted in the trees bearing flowers with included stamens/anthers and vice versa.
I am also intrigued by the reason behind different individuals of this tree bearing separate kinds of flowers i.e. with ‘exserted anthers – included stigma’ and vice versa. I have not come across these two different flower types/morphs on a single individual.
Based on the above, would it be correct to infer that this tree is a distylous plant exhibiting heterostyly?
In the description of the genus Morinda in Flora of China, the flowers are said to be “bisexual and distylous”.
Flora of China further states that “Morinda includes a notable range of breeding systems (Johansson, Opera Bot. 122: 1-167. 1994), but most of the species are apparently distylous, with the anthers and stigmas separated and their positions reciprocal between the short-styled and long-styled form of the same species; however, this biology has been sometimes overlooked.”
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As per efi thread :
This species (Morinda exserta Roxb. syn. of Morinda pubescens Sm.) is immediately known by its exsert stamens, half-concealed stigma, and broad-pointed leaves. In all other species figured and described my me, viz. citrifolia, tinctoria, bracteata, multiflora, and angustiflora the stamens are enclosed and the style exserted.
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As per efi thread: