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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 bajacaliforniana

HABIT Perennial; caespitose; clumped densely. Basal innovations intravaginal. Culms geniculately ascending; 15–50 cm long; 1–2 -noded. Culm-nodes purple. Leaf-sheaths glabrous on surface. Leaf-sheath auricles absent. Ligule a ciliolate membrane; 0.4–1.3 mm long; entire, or bilobed. Leaf-blades conduplicate; angular in section; 3–15 cm long; 0.4–0.6 mm wide. Leaf-blade venation comprising 3 vascular bundles; with 7 subepidermal sclerenchyma strands. Leaf-blade surface scabrous; rough adaxially; glabrous.

INFLORESCENCE Inflorescence a panicle.

Panicle open; linear; 4–9 cm long. Primary panicle branches appressed; 1–2 -nate. Panicle axis smooth. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 4–5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 7.8–8.8 mm long; breaking up at maturity; disarticulating below each fertile floret.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.6–4 mm long; 0.75 length of upper glume; chartaceous; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume surface asperulous; rough above. Lower glume apex acute. Upper glume lanceolate; 4.4–5.1 mm long; 0.75–0.9 length of adjacent fertile lemma; chartaceous; without keels; 3 -veined. Upper glume surface asperulous; rough below. Upper glume apex acute.

FLORETS Fertile lemma lanceolate; 5.3–6.7 mm long; chartaceous; without keel; 3 -veined. Lemma surface scaberulous; rough above. Lemma apex acute; scabrous; awned. Principal lemma awn ascending; 2–4.7 mm long overall. Palea 2 -veined. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; with a small lateral lobe. Anthers 3; 2–2.3 mm long. Ovary pubescent on apex.

FRUIT Caryopsis with adherent pericarp; 4.2–4.5 mm long. Hilum linear.

DISTRIBUTION North America: Mexico.

NOTES Poeae. Gonz.-Ledesma 2004.

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