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Descriptions

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

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

Hubbardia

HABIT Annual. Culms prostrate; weak (1/1); 3–9–15 cm long; rooting from lower nodes. Ligule absent. Leaf-blades lanceolate (1), or elliptic (1); membranous (1), or herbaceous (1); flaccid.

INFLORESCENCE Inflorescence a panicle; terminal (1), or axillary (1).

Panicle open.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels filiform.

FERTILE SPIKELETS Spikelets comprising 1 basal sterile florets; 1–2 fertile florets (1); without rhachilla extension. Spikelets lanceolate (1), or elliptic (1), or oblong (1); subterete (1), or dorsally compressed (1); 2–2.325–3 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes definite (1/1).

GLUMES Glumes persistent; exceeding apex of florets. Lower glume lanceolate (1), or elliptic; 1 length of upper glume; membranous; without keels; 5–7 -veined. Lower glume lateral veins ribbed. Lower glume surface without pits; glabrous (1), or pubescent (1). Lower glume apex obtuse (1), or acute (1). Upper glume lanceolate (1), or elliptic; 1.1 length of adjacent fertile lemma; membranous; without keels; 5–7 -veined. Upper glume lateral veins ribbed. Upper glume surface pubescent; with simple hairs (1), or tubercle-based hairs (1). Upper glume apex obtuse (1), or acute (1).

FLORETS Basal sterile florets barren; with palea (1), or without significant palea (1). Lemma of lower sterile floret lanceolate (1), or elliptic (1); hyaline (1), or membranous (1); 5–6 -veined (1), or 7 -veined, or 8–9 -veined (1); obtuse (1), or acute (1). Fertile lemma lanceolate (1), or elliptic (1), or ovate (1); membranous; of similar consistency above (1), or much thinner above (1); without keel; wingless; 5–6 -veined (1), or 7 -veined, or 8–9 -veined (1). Lemma surface unwrinkled; without grooves. Lemma apex obtuse (1), or acute (1). Palea present (1), or absent or minute (1).

FLOWER Lodicules 2 (1/1). Anthers 2 (1/1). Stigmas 2 (1/1).

FRUIT Caryopsis with adherent pericarp; fusiform; isodiametric (1/1); biconvex (1/1). Embryo 0.3 length of caryopsis. Hilum punctiform (1), or elliptic (1).

DISTRIBUTION Tropical Asia.

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