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Descriptions

W.D. Clayton, M. Vorontsova, K.T. Harman & H. Williamson

© Copyright The Board of Trustees, Royal Botanic Gardens, Kew.

Poa chirripoensis

HABIT Perennial; caespitose; clumped densely. Culms erect; 37–58 cm long. Culm-internodes elliptical in section; distally glabrous. Culm-nodes brown. Lateral branches lacking. Leaves mostly basal. Leaf-sheaths keeled; scaberulous; glabrous on surface. Ligule an eciliate membrane; 2–4.5 mm long. Leaf-blades erect; conduplicate; 15–30 cm long; 2–3 mm wide; stiff. Leaf-blade surface scaberulous. Leaf-blade apex abruptly acute; apiculate.

INFLORESCENCE Inflorescence a panicle. Peduncle 7–25 cm long; smooth.

Panicle open; pyramidal; 6–8 cm long; 3–5 cm wide; with spikelets clustered towards branch tips. Primary panicle branches spreading; 2 -nate. Panicle branches flexuous; with scattered hairs.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 1–2 fertile florets; with a barren rhachilla extension. Spikelets oblong; laterally compressed; 3.7–4.4 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong; 3.5–4 mm long; 1 length of upper glume; membranous; 1-keeled; keeled below; 1 -veined. Lower glume primary vein scabrous. Lower glume surface scabrous; rough on veins. Lower glume apex acuminate. Upper glume ovate; 3.5–3.9 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume surface asperulous; rough on veins. Upper glume apex acuminate.

FLORETS Fertile lemma ovate; 3.6–3.9 mm long; membranous; keeled; 5 -veined. Lemma surface puberulous; hairy in lines; with turgid hairs. Lemma apex acute. Palea 1 length of lemma. Palea keels scabrous. Rhachilla extension 0.33–0.5 length of fertile floret.

FLOWER Lodicules 2; membranous. Anthers 3.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION South America: Mesoamericana.

NOTES Poeae. Fl Costa Rica 1994.

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