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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.
Hubbardia diandra
HABIT Annual. Culms prostrate; weak; 3–15 cm long; rooting from lower nodes. Culm-nodes glabrous. Leaf-sheaths 0.3–0.5 cm long; mostly shorter than adjacent culm internode; hirsute. Ligule absent. Leaf-blades elliptic; 0.5–3 cm long; 3–6 mm wide; membranous; flaccid. Leaf-blade venation with 14 secondary veins. Leaf-blade surface hirsute; hairy on both sides; with tubercle-based hairs. Leaf-blade margins scaberulous. Leaf-blade apex acute.
INFLORESCENCE Inflorescence a panicle; comprising 3–5 fertile spikelets; axillary.
Panicle open; bearing few spikelets. Panicle axis glabrous. Panicle branches capillary.
Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.
FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 2 fertile florets; without rhachilla extension. Spikelets lanceolate, or elliptic; subterete; 2–2.3 mm long; 0.3–0.4 mm wide; breaking up at maturity; disarticulating below each fertile floret.
GLUMES Glumes persistent; similar; exceeding apex of florets; similar to fertile lemma in texture. Lower glume lanceolate, or elliptic; 2–2.3 mm long; 1 length of upper glume; 1 length of spikelet; membranous; without keels; 5–7 -veined. Lower glume lateral veins ribbed. Lower glume margins tuberculately ciliate. Lower glume apex acute. Upper glume lanceolate, or elliptic; 2–2.4 mm long; 1.1 length of adjacent fertile lemma; membranous; without keels; 5–7 -veined. Upper glume lateral veins ribbed. Upper glume surface pubescent. Upper glume margins ciliate. Upper glume apex acute.
FLORETS Basal sterile florets barren; with palea; attached to and deciduous with the fertile. Lemma of lower sterile floret similar to fertile lemma; lanceolate; 1.8–2.2 mm long; hyaline; 5–7 -veined; acute. Fertile lemma lanceolate, or ovate; 1.8–2.2 mm long; 0.3–0.4 mm wide; membranous; without keel; 5–7 -veined. Lemma surface glabrous. Lemma apex acute. Palea absent or minute.
FLOWER Lodicules 2; 0.5 mm long. Anthers 2; 0.5 mm long. Filaments 2 mm long. Stigmas 2; plumose.
FRUIT Caryopsis with adherent pericarp; fusiform; 1 mm long; dark brown. Hilum punctiform.
DISTRIBUTION Asia-tropical: India.
NOTES Hubbardieae. Chandon et al 2012.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
