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Descriptions

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

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

Helictotrichon mirandanum

HABIT Perennial; caespitose. Rhizomes elongated. Culms 30–60 cm long. Ligule an eciliate membrane; 3–7 mm long; 0.5–3 mm long on basal shoots; acute. Leaf-blades conduplicate; 6–15 cm long; 0.5–2 mm wide. Leaf-blade venation with subepidermal sclerenchyma attached to veins above; without layer of subepidermal sclerenchyma masking vein striation. Leaf-blade surface ribbed; grooved abaxially.

INFLORESCENCE Inflorescence a panicle; comprising 3–12 fertile spikelets.

Panicle open; linear; 8–14 cm long; bearing few spikelets. Primary panicle branches indistinct the panicle almost racemose. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–6 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 15–20 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 2–3 mm long; glabrous, or pilose; with 1–1.5 mm long hairs. Floret callus pilose. Floret callus hairs 1.5–2.5 mm long.

GLUMES Glumes persistent; similar; shorter than spikelet; thinner than fertile lemma. Lower glume elliptic; 11–15 mm long; 0.75 length of upper glume; membranous; 1-keeled; 3 -veined. Lower glume apex acute. Upper glume elliptic; 7–11 mm long; 1.1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 10–14 mm long; cartilaginous; yellow, or light brown; without keel; 5–7 -veined. Lemma apex dentate; 2 -fid; obtuse; awned; 1 -awned. Principal lemma awn dorsal; arising 0.5 way up back of lemma; geniculate; flat below; 12–15 mm long overall; with twisted column. Palea keels ciliolate. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; hairy at apex. Hilum linear.

DISTRIBUTION Europe: southwestern.

NOTES Aveneae. Fl Eur 1995.

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