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47. Thawatchaia M. Kato, Koi & Y. Kita

Thawatchaia M. Kato, Koi & Y. Kita, Acta Phytotax. Geobot. 55: 66 (2004).

Roots crustose, green, irregularly lobed; stems very short, simple, scattered on upper surface of  root; fertile stems appressed to or sometimes strongly oblique to root surface or rarely ascending, 2--3 mm long. Leaves on juvenile (submerged) stems linear, 2--5, in 2 ranks, in small rosettes, sheathed at base; leaves of flowering stems imbricate, scale-like, arranged in 4 rows; 4--6 per row, upper ones 3-lobed or uppermost one sometimes 2­-lobed with a lateral lobe reduced, 1.5--3  mm long; lobes acute, the median usually somewhat longer than the laterals. Spathellas ellipsoidal, thin, not ridged, rupturing irregularly at tip. Flowers solitary; pedicel 2--2.5 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 andropodium, exceeding ovary; pollen in dyads. Capsules ellipsoidal, somewhat flattened; valves equal, each with 3 or 4 ribs; stigmas linear. Seeds 14--18(--22). One sp., T. trilobata M. Kato, Koi & Y. Kita, N Thailand.

Subfam. Podostemoideae

Thawatchaia trilobata. G Fragment of crustose root bearing juvenile-leaved shoots (3 mm). H Three-lobed leaf (1 mm). I Shoot with spathella splitting (1 mm). J Flower emerging from spathella (1 mm). K Young capsule (1 mm).

Cook & Rutishauser 2007

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