Germainia pilosa Chai-Anan

Teerawatananon, A., Sungkaew, S., Boontia, V. & Hodkinson, T. R., 2013, A taxonomic revision of Germainia (Andropogoneae: Poaceae) in Thailand, Blumea 57 (3), pp. 221-228 : 225-227

4. Germainia pilosa Chai-Anan — Plate 3

Germainia pilosa Chai-Anan (1972) 39, f. 3. — Type: Chantanamuck 224 (holo BKF; iso BK, K, L), Thailand, Sakon Nakhon.

Annual, tufted. Culms slender, up to 15 cm tall, erect, branched; nodes glabrous. Leaf­sheaths 0.5 –1 cm long, pilose with tubercle-based hairs, margins scarious and glabrous. Ligule an eciliate membrane, 0.5 – 0.8 mm long. Leaf­blades lanceolate to linear-lanceolate, 1–2 by 0.2 –0.25 cm, pilose with tubercle-based hairs on both surfaces, margins scabrous. Racemes 1, 6 –7 mm long, capitate, composed of 2– 3(–4) pairs of spikelets; peduncles slender, 3 –6 cm long, waxy. Sessile spikelets yellowish green to purplish, oblong, 4 – 4.5 by c. 2 mm; lower glumes chartaceous, oblong, 3.8 –4 by 2 – 2.2 mm, glabrous, muticous or truncate or slightly denticulate, 7– 9-nerved, nerves anastomosing below apex; upper glumes lanceolate, 4 – 4.5 by 0.8 –1.5 mm, pubescent on the upper half, obtuse, 3-nerved; lower lemmas lanceolate, 3.5– 3.8 mm long, pubescent on the upper half, obtuse, 1-nerved; lower paleas lanceolate, 3.5– 3.8 mm long, pubescent on dorsal surface on the upper half, obtuse; upper lemmas absent; upper paleas similar to the lower palea; stamens 2, anthers yellow to purple, 2 – 3 mm long. Pedicelled spikelets lanceolate, 3.5 – 4 by 0.2 – 0.6 mm, caducous; pedicels 1–2 mm long, glabrous; spikelet callus linear, 0.5 –1 mm long, attached obliquely, hairy, hairs 0.5 –0.8 mm long; lower glumes chartaceous, lanceolate, 3.5 – 4(–5.5) by 0.3– 0.6 mm, pubescent, apex hispid, acute to obtuse, 3-nerved; upper glumes lanceolate, 3 – 4(– 5) by 0.2–0.5 mm, pubescent, acute to obtuse, 3-nerved; lower florets suppressed; upper lemmas linear, 2 –2.5 mm long, awns 3– 4.5 cm long, columns 1– 2.5 cm long; upper paleas lanceolate, 2.8 – 3 mm long, dentate; styles 2, stigmas pale brown, 1.4 –1.5 mm long. Caryopsis oblong, 1.3 –1.5 mm long.

Distribution — Endemic toThailand (NE: Sakon Nakhon, Mukdahan).

Habitat & Ecology — On moist sandy soil in open areas, along stream banks, deciduous dipterocarp and mixed deciduous forests, and also on open and moist rocky plain areas, 500– 800 m altitude.

Specimens examined. Chantanamuck 224; Esser 98­207; Murata et al. 50818, 50864; Norsangsri 568; Sunarnakoses 2016; Teerawatananon & Kritsanachandee 949; Teerawatananon & Sungkaew 886.

Note — Chai-Anan (1972) mentioned that the width of the lower glume of the pedicelled spikelet was 1–1.4 mm. However, we examined the holotype and isotype from BKF, L, as well as fresh specimens in the field and found that their lower glumes are not wider than 0.6 mm.

Figures

Plate 3 Germainia pilosa Chai-Anan. a. Habit; b, d. habitats on moist sandy soil areas; c. inflorescence (b, c: Teerawatananon & Kritsanachandee 949; d: Teerawatananon & Sungkaew 886). — Photos: a–c. N. Kritsanachandee; d. A. Teerawatananon.