Eutrema tenue (Miq.) Makino

The record in FRPS of Eutrema tenue from Taiwan is based on misidentified plants of E. wasabi. Except for having stout styles to 0.7 mm (vs. 1-2 mm), the type of E. thibeticum is indistinguishable from that of E. tenue.

Herbs 12-35(-55) cm tall, glabrous or retrorsely pilose; rhizomes not fleshy. Stems decumbent, simple, often a few from base. Basal leaves rosulate; petiole 3-8(-10) cm; leaf blade cordate or reniform, 1-3(-5) × 1-3(-6) cm, base cordate, margin dentate, repand, or subentire, with distinct apiculate callosities terminating ultimate veins, apex rounded or obtuse. Middle cauline leaves with petioles 0.7-2.5 cm; leaf blade broadly ovate to ovate-cordate, 0.7-2(-3.5) × 0.8-2 cm, palmately veined, base and margin as in basal leaves, apex acute. Infructescence lax raceme, bracteate throughout. Fruiting pedicels reflexed or spreading, slender, (0.5-)1-2(-2.5) cm. Sepals ovate, 1.5-2 × 1-1.2 mm, caducous. Petals white, oblong-spatulate, 4-5 × 1-1.5 mm. Filaments white, 1.5-2 mm; anthers ovate, 0.3-0.5 mm. Ovules 6-10 per ovary. Fruit linear, (0.8-)1-2 cm × 1.5-2 mm, terete, torulose; valves with an obscure midvein; gynophore absent or obsolete; septum complete; style 0.5-2 mm. Seeds oblong, plump, 2-3 × 1-1.5 mm. Fl. Mar-May, fr. Apr-Jun.

Guizhou, Sichuan, Xizang, Yunnan [Japan].

Near sea level to 4000 m.

Nasturtium tenue Miquel, Ann. Mus. Bot. Lugduno-Batavi 2: 71. 1866; Cardamine bracteata S. Moore (1878), not Philippi (1893), nor Suksdorf (1918); Eutrema bracteatum (S. Moore) Koidzumi; E. hederifolium Franchet & Savatier; E. thibeticum Franchet; E. wasabi (Siebold) Maximowicz var. tenue (Miquel) O. E. Schulz; Neomartinella guizhouensis S. Z. He & Y. C. Lan; Wasabia hederifolia (Franchet & Savatier) Matsumura.