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Descriptions

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

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

Sasamorpha borealis

HABIT Perennial. Rhizomes elongated; leptomorph. Culms erect; 150–200 cm long; 5–8 mm diam.; woody. Culm-internodes terete; hollow; distally glabrous, or pubescent; with reflexed hairs. Culm-nodes pubescent. Lateral branches ample; arising from upper culm. Bud complement 1. Branch complement one; solitary; as thick as stem. Culm-sheaths persistent; glabrous; without auricles. Leaves 2–3 per branch. Leaf-sheaths glabrous on surface, or puberulous. Leaf-sheath oral hairs lacking. Ligule an eciliate membrane. Leaf-blade base with a brief petiole-like connection to sheath. Leaf-blades oblong; 15–21 cm long; 15–25 mm wide. Leaf-blade surface glabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 8–10 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 5–8 fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 15–25 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2 mm long; obscured by lemmas; pubescent.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume lanceolate; 4–5 mm long; scarious; without keels. Lower glume apex acuminate. Upper glume ovate; 6–7 mm long; scarious; without keels; 7–9 -veined. Upper glume margins ciliate. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 8 mm long; chartaceous; without keel; 11–13 -veined. Lemma margins ciliate. Lemma apex acuminate. Palea 1 length of lemma; 8–10 -veined. Palea keels ciliate. Palea apex truncate, or obtuse. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3; ovate; 2–2.5 mm long; veined; ciliate; obtuse. Anthers 6; 5 mm long. Stigmas 3.

FRUIT Caryopsis with adherent pericarp; apex unappendaged.

DISTRIBUTION Asia-temperate: Soviet far east and eastern Asia.

NOTES Arundinarieae. Ind. Jap. Bam. 2001.

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