Inversodicraea boumiensis (C.Cusset) Cheek (Cheek and Haba 2016: 55)

Bidault, Ehoarn, Boupoya, Archange, Ikabanga, Davy U., Nguimbit, Igor, Texier, Nicolas, Rutishauser, Rolf, Mesterhazy, Attila & Stevart, Tariq, 2023, Novitates Gabonenses 93: a fresh look at Podostemaceae in Gabon following recent inventories, with a new combination for Ledermanniella nicolasii, Plant Ecology and Evolution 156 (1), pp. 59-84 : 59

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Inversodicraea boumiensis (C.Cusset) Cheek (Cheek and Haba 2016: 55)


Inversodicraea boumiensis (C.Cusset) Cheek (Cheek and Haba 2016: 55) View in CoL

Figs 3C View Figure 3 , 4A View Figure 4

Ledermanniella boumiensis C.Cusset ( Cusset 1983: 370, plate 3)


GABON • Boumi waterfalls at Mbigou [" Chutes de la Boumi à Mbigou"]; 5 Jul. 1927; [1°54 ’16” S, 11°54 ’31” E]; 665 m; fl., fr.; Le Testu 6536; holotype: P [P00179270]; isotypes: BM [BM000910485], BR [BR0000006267230], P [P00179271] GoogleMaps .


Endemic to the Louétsi river, south-eastern Gabon. Before 2017, this species was only known from a single collection made at Boumi falls, near Mbigou. In 2018, it was discovered at two additional sites on the same river, at Issala and Dibwangui.

Habitat and ecology.

Rapids and falls in rivers from ca 30 to 50 m wide, 380-665 m in elevation. It appears to be very rare at the sites where it has been encountered. Flowers and fruits were collected in July and August. At Dibwangui, it grows intermingled with I. aff. annithomae , in strong currents.


Inversodicraea boumiensis can be distinguished from I. annithomae mainly by its much smaller stature (stem <1 mm thick and up to 2-3 cm long vs stem up to 3 mm thick and 20 cm long), stem scales (thin and spreading in I. boumiensis vs thick and appressed in I. annithomae ), and pollen as dyads (vs monads in I. annithomae ). The collection Letouzey 15339 from the Ntem river (Cameroon) was attached to I. boumiensis by Cusset, but later determined as I. tchoutoi ( Cheek et al. 2017). After examination of this collection, we choose to follow Cheek et al. (2017).