Festuca sumapana

HABIT Perennial; caespitose; clumped densely. Cataphylls inconspicuous. Rhizomes absent. Basal innovations intravaginal. Culms erect; slender; straight; 15–20 cm long; 2 -noded; without nodal roots. Culm-internodes terete. Culm-nodes without exudate; glabrous. Lateral branches lacking. Leaves mostly basal; 0–1 per branch. Leaf-sheaths tight; unthickened at base; open for most of their length; without keel; striately veined; glabrous on surface. Leaf-sheath auricles absent. Ligule an eciliate membrane; 0.3 mm long; membranous; white; bilobed; truncate. Leaf-blade base symmetrical. Leaf-blades straight, or curved; involute; angular in section; 8–12 cm long; 0.5–0.7 mm wide; coriaceous; firm; mid-green. Leaf-blade midrib indistinct. Leaf-blade venation indistinct; with subepidermal sclerenchyma strands similar in size; with subepidermal sclerenchyma free from veins; without layer of subepidermal sclerenchyma masking vein striation. Leaf-blade surface scabrous; glabrous. Leaf-blade margins smooth; glabrous. Leaf-blade apex obtuse.

INFLORESCENCE Inflorescence a panicle; with 1 peduncles per sheath. Peduncle terete; eglandular; glabrous.

Panicle contracted; lanceolate; continuous, or interrupted; dense; straight; 5–7 cm long; 0.4–0.6 cm wide; bearing few spikelets; contracted about primary branches. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–4 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 9.5–11 mm long; breaking up at maturity; disarticulating below each fertile floret. Spikelet callus glabrous. Rhachilla internodes scaberulous; glabrous. Floret callus glabrous.

GLUMES Glumes persistent; similar; subequal in width; shorter than spikelet. Lower glume lanceolate; 4–5 mm long; 0.75 length of upper glume; membranous, or chartaceous; pallid, or light green, or purple; without keels, or 1-keeled; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous. Lower glume apex acute. Upper glume lanceolate; 5.5–6 mm long; 0.9 length of adjacent fertile lemma; chartaceous; pallid, or light green, or purple; 1-keeled; 3 -veined. Upper glume surface scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; symmetrical; 6.5–7 mm long; chartaceous; pallid, or light green, or purple; keeled; 5 -veined. Lemma surface papillose. Lemma apex awned; 1 -awned. Principal lemma awn stiff; 0.5–1.5 mm long overall. Palea 2 length of lemma; 2 -veined. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2. Anthers 3; 0.6–0.8 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp. Hilum linear.

DISTRIBUTION South America: western South America.

NOTES Poeae. Stancik 2005.

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