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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 talamancensis

HABIT Perennial; caespitose; clumped densely. Basal innovations extravaginal. Culms 45–90 cm long; 2 -noded. Lateral branches lacking. Leaf-sheaths open for most of their length; glabrous on surface. Ligule a ciliolate membrane; 0.4–1 mm long. Leaf-blades conduplicate; 10–30 cm long; 0.5–0.7 mm wide. Leaf-blade venation with subepidermal sclerenchyma free from veins. Leaf-blade surface scaberulous; rough adaxially; glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; elliptic; nodding; 10–14 cm long; 3–4 cm wide. Primary panicle branches ascending; 2 -nate; 4–6 cm long. Panicle axis smooth.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels smooth.

FERTILE SPIKELETS Spikelets comprising 2 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 6.4–7 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume linear; 3.4–4.5 mm long; 0.75 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 4.8–6 mm long; 0.9–1 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume inner surface scabrous. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 5–6 mm long; chartaceous; without keel; 5 -veined. Lemma lateral veins obscure. Lemma surface scabrous; rough below; puberulous; inner surface scabrous. Lemma apex acuminate; awned; 1 -awned. Principal lemma awn 0.3–1 mm long overall. Palea 0.9 length of lemma; 2 -veined. Palea keels scabrous. Palea surface scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2. Anthers 3; 1.1–1.4 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; sulcate on hilar side; 2.8–3.5 mm long; dark brown; glabrous. Embryo 0.2 length of caryopsis. Hilum linear; 0.6 length of caryopsis.

DISTRIBUTION South America: Mesoamericana.

NOTES Poeae. Davidse 1994.

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