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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 nubensis

HABIT Perennial. Rhizomes short. Basal innovations extravaginal. Culms erect; 12–26 cm long; 2–3 -noded. Leaf-sheaths tubular for much of their length; with 0.66 of their length closed; 3.2–8.6 cm long; keeled. Ligule an eciliate membrane; 1.5–4.2 mm long; acuminate. Leaf-blades conduplicate, or involute; 5.7–13.3 cm long; 1–1.5 mm wide. Leaf-blade apex obtuse; hooded.

INFLORESCENCE Dioecious. Inflorescence a panicle.

Panicle contracted; elliptic; dense; 3.5–7 cm long; 0.15 cm wide. Primary panicle branches appressed. Panicle branches smooth, or scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 3–5 fertile florets; with diminished florets at the apex. Spikelets oblong; laterally compressed; 4–6 mm long; 2.5–4.5 mm wide; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes smooth. Floret callus glabrous.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2.5–4 mm long; 0.8–1 length of upper glume; membranous; 1-keeled; 1–3 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent, or obscure. Lower glume apex acuminate. Upper glume lanceolate; 3–4 mm long; 1 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex acuminate.

FLORETS Fertile florets female. Fertile lemma lanceolate; 3–4 mm long; 0.8–1 mm wide; membranous; keeled; 5 -veined. Lemma midvein scabrous. Lemma surface smooth. Lemma apex acute. Palea 0.9 length of lemma. Palea keels scaberulous; adorned above. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; lanceolate; 0.5–0.8 mm long; membranous. Anthers 3; 1.8–2.2 mm long. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; ellipsoid; 2 mm long. Embryo 0.25 length of caryopsis. Hilum punctiform.

MALE Male inflorescence similar to female. Male spikelets resembling female.

DISTRIBUTION South America: southern South America.

NOTES Poeae. Giussani, Pepi & Morrone 2009.

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