現在E. setaceumは一種とされているが，ある程度の分別は可能かもしれない．
v.6 (1894) - The flora of British India - Biodiversity Heritage Library
より…
E. setaceum (South India)
receptacle conical villous
floral bracts cymbiform acute coriaceous glabrous black
seed dark brown
female sepals cymbiform, glabrous or nearly so
female petals narrow, cilliate, with or without gland
seeds oblong, quite smooth
E. capillus-naiadis (north India)
receptacle conical or convex villous
floral bracts whitish membranous outer glabrous inner with long dorsal hairs
seed dark olive brown or black
female sepals cymbiform, glabrous or nearly so
female petals narrow, cilliatewith long hairs(Burmese, Khasian), glabrous(Concan, Cochin-Chinese) with or without gland
E. bifistulosum (West Africa, Australia)
receptacle conical glabrous
floral bracts mucronate, less membranaceous, dark all with short dorsal bristles
seed chestnut brown, smaller than E. setaceum, E. capillus-naiadus.
female sepals cymbiform, glabrous or nearly so
female petals narrow,glabrous with minute apical gland
https://www.biodiversitylibrary.org/item/129763#page/225/mode/1up
E. cauliferum (Japan)
receptacle glabrous
floral bracts very scarcely longer than flower, obovato-cuneate or spathulate-cuneate, or acutish at apex, minutely crenulate above. concave, subhyaline, very minutely nigro-punctuate above internally about 1.2mm long.
seed
female sepals 3, erect, obovate-elliptical, rounded and subcillated at the apex
female petals 3, erect, hardlu exceeding the sepals in height, spathulate-linear, 1-nigro-spotted and often few-ciliolated at the acutic apex
Eriocaulon equisetoides (Java)
情報求ム！
Eriocaulon fluitans
https://www.biodiversitylibrary.org/item/8375#page/284/mode/1up
p．277-278
E. limosum
https://www.biodiversitylibrary.org/item/687#page/80/mode/1up
p.74-75
E. melanocephalum
https://www.biodiversitylibrary.org/item/32146#page/559/mode/1u
p．549-550
E. schweinfurthii
https://www.biodiversitylibrary.org/item/687#page/79/mode/1up
p．74
Eriocaulon usterianum
https://www.biodiversitylibrary.org/item/104945#page/320/mode/1up
p．284-285
別種とされているもの
Eriocaulon albosetaceum
https://www.tandfonline.com/doi/abs/10.1080/00837792.2019.1572964
＊本文未入手
さて，この中でどれだけ同じものと違うものがあるか…原記載の本文リンクをここにほぼそろえたので，あとは色々遊んでみてほしい．
