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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.
Festuca jansenii
HABIT Perennial; culms solitary. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Culms erect; 45–95 cm long; 2–4 -noded. Lateral branches lacking. Leaf-sheath auricles absent, or falcate. Ligule an eciliate membrane; 1 mm long; truncate. Leaf-blades convolute; 10–25 cm long; 1–2 mm wide. Leaf-blade venation with 8 secondary veins; 3 inner ridges. Leaf-blade surface scaberulous; rough adaxially; pilose; hairy adaxially. Leaf-blade margins cartilaginous; scabrous.
INFLORESCENCE Inflorescence a panicle. Peduncle scaberulous above.
Panicle ovate; 6–12 cm long. Primary panicle branches ascending, or spreading; 4–8 cm long. Panicle branches scaberulous.
Spikelets solitary. Fertile spikelets pedicelled.
FERTILE SPIKELETS Spikelets comprising 3–6 fertile florets; with diminished florets at the apex. Spikelets elliptic, or ovate; laterally compressed; 7–15 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes scaberulous.
GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 4.1–4.7 mm long; 0.66 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent. Lower glume surface asperulous. Lower glume apex acute. Upper glume ovate; 6.9–7.3 mm long; 1 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume primary vein scabrous. Upper glume surface asperulous; rough generally. Upper glume apex acute.
FLORETS Fertile lemma elliptic, or orbicular; 6–7 mm long; chartaceous; glaucous, or purple; without keel; 5 -veined. Lemma midvein scabrous. Lemma surface scaberulous; rough generally; pilose. Lemma margins scaberulous. Lemma apex acute; awned; 1 -awned. Principal lemma awn 3–4 mm long overall. Palea 7–7.5 mm long; 2 -veined. Palea keels scabrous. Palea surface asperulous. Apical sterile florets resembling fertile though underdeveloped.
FLOWER Lodicules 2. Anthers 3. Ovary glabrous, or with a few apical hairs.
FRUIT Caryopsis with adherent pericarp. Hilum linear.
DISTRIBUTION Asia-tropical: Papuasia.
NOTES Poeae. Alp Fl N Guin 1999.
Please cite this publication as detailed in How to Cite Version: 3rd February 2016.
