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Descriptions

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

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

Festuca hubsugulica

HABIT Perennial; caespitose; clumped loosely. Rhizomes short. Butt sheaths sparsely hairy. Basal innovations extravaginal. Culms geniculately ascending; 30–50 cm long. Culm-internodes smooth. Leaf-sheaths open for most of their length; glabrous on surface. Ligule an eciliate membrane; 1 mm long; truncate. Leaf-blades 3–4 mm wide; stiff. Leaf-blade margins scabrous. Leaf-blade apex acuminate.

INFLORESCENCE Dioecious. Inflorescence a panicle.

Panicle open; ovate; nodding; 4–8 cm long. Primary panicle branches 1–2 -nate; bearing 2–5 fertile spikelets on each lower branch. Panicle axis smooth. Panicle branches straight, or flexuous; scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 5–10 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes scaberulous. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 3–4 mm long; 0.75 length of upper glume; membranous; pallid; without keels; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 4–5 mm long; 0.7–0.8 length of adjacent fertile lemma; membranous; pallid; without keels; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acute.

FLORETS Fertile florets female. Fertile lemma ovate; 5–6 mm long; chartaceous; keeled; lightly keeled; 5 -veined. Lemma midvein scabrous. Lemma lateral veins prominent. Lemma surface puberulous. Lemma apex obtuse; muticous. Palea 1 length of lemma; 2 -veined. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Anthers 3; 3–3.5 mm long. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

MALE Male inflorescence similar to female. Male spikelets resembling female.

DISTRIBUTION Asia-temperate: Siberia and Mongolia.

NOTES Poeae. Krivot 1995.

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