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44. Hanseniella C. Cusset

Hanseniella C. Cusset, Bull. Mus. Natn. Hist. Nat., Paris IV, . 14: Sect B. Adansonia 1: 36 (1992), M. Kato, Acta Phytotax. Geobot. 55: 133--165 (2004), rev.

Roots crustose, green, irregularly lobed or branched, lobes ± 4 mm long; stems short, simple, scattered on upper surface of root. Leaves on juvenile or submerged stems linear, simple in irregular rosettes; leaves on flowering or emergent stems imbricate, scale-like, of two kinds, arranged in 4 rows; 2 rows scale-like and entire, ± 1.5 mm long;  remaining 2 rows 2-lobed, 1.25--1.75 mm long, with the sinus half or more as long as leaf, the lobes ± equal and bluntly rounded. Spathellas ellipsoidal, thick, with 2 or 3 ridges, rupturing irregularly at tip. Flowers solitary; pedicel 2--3 mm long, just holding flowers above spathella; tepals 2, 1 each side of andropodium, linear-triangular, almost reaching  top of ovary; stamens 2, borne on an andropodium, much exceeding  ovary; pollen in dyads. Capsules ellipsoidal, somewhat flattened, borne on a ± 0.8 mm long gynophore; valves equal, each with 3 main ribs, in H. heterophylla sometimes with up to 3 fainter additional ribs; stigmas linear. Seeds 8--12, relatively large, 0.6--0.9 mm long. Two spp., H. heterophylla C. Cusset and H. smitinandii  M. Kato, both from N Thailand.

Subfam. Podostemoideae

Hanseniella heterophylla. D Shoots with capsule (1 mm). E Flower (1 mm). F Placenta with seeds (0.5 mm).

Cook & Rutishauser 2007

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