Mnesithea thailandica Traiperm & Boonkerd

Perennial grass. Leaf sheaths loose, pubescent. Ligule membranous with ciliate margins. Blades pubescent on both surfaces, apex acute. Inflorescences a compound racemose. Racemes solitary, subterete, terminal. Spikelets in pairs. Sessile spikelets slightly twice as long as the rhachis nodes. Lower glume triangular, indurate, smooth, margins folded, pubescent on the back, apex with 2 narrow wings. Upper glume ovate or boat-shaped, keeled on the upper and pilose along keel. Pedicelled spikelets oblong, c. 1 mm long, pubescent, reduced to 2 asymmetrical glumes, keeled along the margins. Pedicels oblong or ribbon-like, pubescent.

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Vincetoxicum siamicum A. Kidyoo

Erect rheophytic herb with watery latex in all parts. Leaves whorl of three, sometimes opposite near the top; blade linear-oblong to linear-lanceolate, membranous-coriaceous, base acute to attenuate, apex acute; margins entire, sometimes with short scattered hairs. Inflorescences racemes with condensed rachis, subumbelliform, often paniculate, extra-axillary; flower bud ovoid. Calyx lobes 5, green with reddish brown apex, ovate-lanceolate, apex acute, inside with one small gland between each pair of lobes. Corolla white, rotate; lobe slightly reflexed, oblong-lanceolate, apex obliquely obtuse or retuse, margin and apex revoluted. Corona 5, half as high as anther, erect, joined at base to form a flat, fleshy, shallow cup; lobes triangular-ovate, apex acute-blunt, white. Anthers 5, fleshy, oblong, yellowish white. Ovary 2, glabrous. Follicles 1, linear-lanceolate in outline.

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กวักนวลจันทร์
Arisaema nonghinense Klinrat. & Yannawat

Deciduous, dioecious herb to 0.8 m tall. Subterranean stem a subglobose tuber, light brownish-yellow, proliferous. Leaves trifoliolate, alternate; petiole reddish-green to dark purplish-red. Spathe tube cylindrical, creamy-white to pale yellow; spathe limb lanceolate, 3-4 times longer than tube, pale yellow, ending in a tail to 3 cm long. Spadix appendix distinctly exserted from the spathe tube, lower half entire, whitish to brownish-red, upper half divided into many pale yellow to brownish-red synandrodes; fertile zone staminate or pistillate; staminate flowers loosely arranged; pistillate flowers densely packed, cylindrical. Fruits densely packed, obovoid, green turning bright red when ripe. seeds 2-3 per berry, light brown.

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เอื้องข้าวตอกหิน
Amitostigma thailandicum Seidenf. & Thaithong

Terrestrial orchid. Short stem with about 3-4 nearly radical rather soft green leaves, strap-shaped. Terminal inflorescence about 8 cm high. Scape thin, with 3-4 flowers. Flower pure white. Dorsal sepal much hooded, broad ovate, acute. Lateral sepals likewise, slightly larger. Petals about as large as dorsal sepal. Lip from a short neck adnate to the column, broadening into a trilobulate blade. Side-lobes small, rounded, midlobe large, orbicular. Column 3 mm.

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