GrassBase - The Online World Grass Flora


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

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

Aulonemia yanachagensis

HABIT Perennial; caespitose. Rhizomes short; pachymorph. Culms erect, or scandent; 100–200 cm long; 20–30 mm diam.; woody. Culm-internodes terete; distally glabrous, or pubescent. Culm-nodes without obvious supra-nodal ridge. Lateral branches dendroid. Bud complement 1. Branch complement one; solitary. Leaves 3–4 per branch. Leaf-sheaths pilose; with tubercle-based hairs. Leaf-sheath oral hairs setose; spreading; 8–17(–30) mm long. Leaf-sheath auricles falcate; 3–4.5 mm long. Ligule absent. Collar with external ligule. Leaf-blade base with a brief petiole-like connection to sheath; petiole 0.1–0.2 cm long. Leaf-blades reflexed; deciduous at the ligule; lanceolate; 7–14 cm long; 13–22(–30) mm wide. Leaf-blade surface glabrous. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; ovate; 16–24 cm long; 6–25 cm wide. Panicle branches capillary.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising (4–)5–7(–8) fertile florets; with diminished florets at the apex. Spikelets linear; laterally compressed; 20–37 mm long; 1–2 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 4.5–5.8 mm long.

GLUMES Glumes persistent; shorter than spikelet. Lower glume lanceolate, or ovate; 2.5–3 mm long; 0.66–0.75 length of upper glume; membranous; without keels; 7 -veined. Lower glume surface puberulous. Lower glume apex acute. Upper glume lanceolate; (3–)3.8–4.5 mm long; 0.5–0.66 length of adjacent fertile lemma; membranous; without keels; 7 -veined. Upper glume surface puberulous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 6.5–8.5 mm long; chartaceous; without keel; (7–)9 -veined. Lemma surface puberulous. Lemma apex acute. Palea 6.5–8.5 mm long; 1.1 length of lemma. Palea keels 0.8–1 mm apart; ciliolate. Palea apex dentate; 2 -fid. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 3. Anthers 3; 3–4 mm long. Stigmas 2. Ovary pubescent all over.

FRUIT Caryopsis with adherent pericarp.

DISTRIBUTION South America: western South America.

NOTES Bambuseae. Judz. & Tyrrell 2009.

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