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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 castilloniana

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms erect; 15–25 cm long; 1 -noded. Culm-internodes terete; striate; distally glabrous. Lateral branches lacking. Leaf-sheaths glabrous on surface. Ligule an eciliate membrane; 2–2.3 mm long; entire, or lacerate. Leaf-blades conduplicate, or involute; 3–7 cm long; 1–1.3 mm wide. Leaf-blade venation comprising 7 vascular bundles; with 5 inner ridges; with subepidermal sclerenchyma attached to veins above and below; without layer of subepidermal sclerenchyma masking vein striation. Leaf-blade apex acuminate.

INFLORESCENCE Inflorescence a panicle.

Panicle open; oblong; dense; 6–10 cm long. Primary panicle branches appressed; 2 -nate. Panicle axis glabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–5 fertile florets; with diminished florets at the apex. Spikelets lanceolate, or elliptic; laterally compressed; 6–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.5–1 mm long; scaberulous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 4.5 mm long; 0.8–0.9 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface scabrous; rough above. Lower glume apex acute. Upper glume lanceolate; 5–5.5 mm long; 1 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume surface scabrous; rough above. Upper glume apex acute.

FLORETS Fertile lemma elliptic; 4–5 mm long; chartaceous; without keel; 5 -veined. Lemma surface scabrous. Lemma apex acuminate. Palea 1 length of lemma; 2 -veined. Palea keels scabrous. Palea apex dentate; 2 -fid. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2. Anthers 3; 1.8–2.3 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; oblong; 2–2.5 mm long. Hilum linear; 0.75 length of caryopsis.

DISTRIBUTION South America: southern South America.

NOTES Poeae. Turpe 1996.

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