Wongso, sp. nov.
— Fig. 2–4. Holotype: Indonesia, W Kalimantan, Schwaner mountains, Ketapang Regency, S of Sekadau, 22 Sep 2015, S. Wongso SW 1567 (BO; isotypes: C, L).
— Cryptocoryne bastmeijeri
differs from C. auriculata
and C. isae
by having up to 40 spreading green leaves, with a triangular-ovate blade, and by the short spathe limb. Its chromosome number of 2n = 14 has hitherto not been recorded for Cryptocoryne
— Aquatic to amphibious herbs, c. 10 cm tall. Rhizome thick, notched, with only a few thin stolons. Leaves 20–40 together in a rosette, spreading ± horizontally from upright petiole, 5–15 cm long; blade dark green, lighter green to purplish abaxially, triangular-ovate, 2-3 × 3-5 cm, smooth. Cataphylls whitish, c. 1.5 cm long 2-keeled, usually situated below soil surface. Peduncle 2–3 cm long. Spathe whitish outside in proximal part, distal ⅓ purplish; kettle cylindric, to 1 cm long, white inside, flap light yellowish; tube c. 0.75 cm long, white inside; limb purple to reddish, ovate, shortly pointed, forward obliquely twisted, to 1.5 cm long, surface with a few rounded protuberances, with an indistinct, darker collar, sometimes with a white line running distally from collar as a result of a folding of limb in young stage, red colour continuing in a more intensive hue a few mm into tube. Spadix c. 1 cm long, with usually 5 whitish female flowers with broadly ellipsoid to emarginate stigmas sometimes with a slight purplish tinge along margin; olfactory bodies yellow, irregular; male flowers 25–30, whitish yellowish. Syncarp on an up to 3 cm long peduncle, brownish purplish, lighter spotted, broadly ovoid, c. 1 cm wide, smooth, persistent stigmas clearly visible. Seeds with germinating embryo emerging c. ⅓ from distal end with c. 5 plumulary processes.
— 2n = 14, reported here for SW 1567.
— As far as known endemic to W Kalimantan, Schwaner mountains, SW of Sintang, where it has been observed in one locality additional to the type locality.
— The type specimen was collected in a swamp forest streamlet with clear, slow-running water, with the leaves spreading over the mud and sand. Altitude range 175–200 m.
— Named after Jan D. Bastmeijer
, of Emmen, The Netherlands, who has for decades meticulously gathered information on Cryptocoryne, and most importantly disseminates this information on his website (Bastmeijer 2017), thereby establishing contacts between enthusiasts worldwide.