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GrassBase - The Online World Grass Flora
Descriptions
W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson
© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.
Arundinella yunnanensis
HABIT Perennial; caespitose. Culms erect; 30–50 cm long; 1–5 mm diam.; 4–7 -noded. Culm-internodes smooth; distally glabrous. Culm-nodes glabrous. Leaf-sheaths mostly shorter than adjacent culm internode; glabrous on surface. Ligule absent. Leaf-blades 3–10 cm long; 1–3 mm wide. Leaf-blade surface glabrous; hairless except near base.
INFLORESCENCE Inflorescence a panicle.
Panicle open; lanceolate; 8–19 cm long. Primary panicle branches appressed; 2 -nate; 4–7.5 cm long. Panicle axis smooth, or scaberulous; glabrous. Panicle branches scabrous.
Spikelets in pairs. Fertile spikelets pedicelled. Pedicels 1–4 mm long; scaberulous.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1 fertile florets; without rhachilla extension. Spikelets ovate; laterally compressed; 3.5–4 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus bearded; obtuse. Floret callus hairs 0.5 length of lemma.
GLUMES Glumes persistent; reaching apex of florets; thinner than fertile lemma. Lower glume ovate; 2.5–3.5 mm long; 0.75 length of upper glume; membranous; 1-keeled; 3–5 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume apex acuminate. Upper glume ovate; 3.5–4 mm long; membranous; glaucous, or purple; 1-keeled; 5 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume apex acuminate.
FLORETS Basal sterile florets male; with palea; persisting on inflorescence. Lemma of lower sterile floret similar to upper glume; ovate; 3.5–4 mm long; membranous; glaucous, or purple; 1-keeled; 5 -veined; obtuse. Fertile lemma lanceolate; 2.5–3 mm long; coriaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface asperulous. Lemma margins involute; interlocking with palea keels. Lemma apex awned; 1 -awned. Principal lemma awn geniculate; 4 mm long overall; with twisted column. Palea 1 length of lemma; coriaceous; 2 -veined. Palea surface asperulous.
FLOWER Lodicules 2; cuneate; fleshy. Anthers 3; 1–2 mm long. Stigmas 2.
FRUIT Caryopsis with adherent pericarp. Hilum punctiform.
DISTRIBUTION Asia-temperate: China.
NOTES Arundinelleae. Keng 1996.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
