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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Pseudosasa xishuangbannaensis

HABIT Perennial. Rhizomes elongated; leptomorph. Culms erect; 150–200 cm long; 5–12 mm diam.; woody. Culm-internodes terete, or channelled; hollow; 25–40 cm long; mid-green and purple; mottled; distally pruinose. Culm-nodes swollen; pubescent. Lateral branches dendroid. Branch complement three. Culm-sheaths deciduous; chartaceous; yellow, or green; hispid; hairy below; hairy on margins; auriculate; ciliate on shoulders. Culm-sheath ligule 1 mm high; ciliate. Culm-sheath blade lanceolate, or ovate; reflexed. Leaves cauline. Leaf-sheaths glabrous on surface; outer margin hairy. Leaf-sheath oral hairs scanty. Leaf-sheath auricles falcate. Ligule an eciliate membrane; 1 mm long; pubescent on abaxial surface; truncate. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.2–0.7 cm long. Leaf-blades lanceolate, or elliptic; 10–22 cm long; 10–40 mm wide. Leaf-blade venation with 8–18 secondary veins. Leaf-blade surface pubescent; hairy abaxially. Leaf-blade margins scaberulous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; 4–9 cm long.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 8–23 mm long; ciliate.

FERTILE SPIKELETS Spikelets comprising 10–14 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 30–60 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes curved; 5–6 mm long; pilose.

GLUMES Glumes several; 5–7 empty glumes; persistent; similar; shorter than spikelet. Upper glume ovate; 6–9 mm long; 0.9 length of adjacent fertile lemma; 9–11 -veined.

FLORETS Fertile lemma ovate; 7–10 mm long; chartaceous; without keel; 9–11 -veined. Lemma lateral veins with cross-veins. Lemma apex acuminate. Palea 8–19 mm long; 1–1.1 length of lemma. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; 2 mm long; ciliate. Anthers 3; 3 mm long. Stigmas 33.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION Asia-temperate: China.

NOTES Arundinarieae. Yu-Xiao Zhang et al 2015.

Please cite this publication as detailed in How to Cite Version: 3rd February 2016.