New! - Search other data sources for Poa pfisteri

Help - Wrong Description?

Kew Data Sources

Kew's Herbarium Catalogue
ePIC - Electronic Plant Information Centre

External Data Sources

Note - this takes you off of our website
Use your browser's back button to return to this page

GrassBase - The Online World Grass Flora

Descriptions

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

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

Poa pfisteri

HABIT Perennial; caespitose; clumped loosely. Rhizomes short. Stolons present. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Basal innovations extravaginal. Culms geniculately ascending; slender; 45–50 cm long; 0.5–0.8 mm diam.; with 0.5–0.66 of their length below uppermost node. Culm-internodes terete. Lateral branches ample. Leaf-sheaths with 0.2–0.5 of their length closed; 4.5–9 cm long; keeled; scaberulous. Ligule an eciliate membrane; (0.2–)0.5–2.5 mm long; scaberulous on abaxial surface; truncate, or obtuse. Leaf-blades involute; 25–30 cm long. Leaf-blade apex hooded.

INFLORESCENCE Dioecious. Inflorescence a panicle; comprising 10–90 fertile spikelets.

Panicle contracted; lanceolate; 4–11 cm long. Primary panicle branches ascending; 2–3 -nate; 2–3.5 cm long; bearing 3–9 fertile spikelets on each lower branch. Panicle axis smooth. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 1 mm long.

FERTILE SPIKELETS Spikelets comprising (2–)3–4 fertile florets; with diminished florets at the apex. Spikelets lanceolate; laterally compressed; 5–6 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.5–1.5 mm long; eventually visible between lemmas; smooth. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume lanceolate; 2–3 mm long; 0.66–0.9 length of upper glume; membranous; 1-keeled; 1 -veined. Lower glume primary vein smooth, or scaberulous. Lower glume lateral veins absent. Lower glume apex acute. Upper glume lanceolate; 2.9–3.5 mm long; 0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein smooth, or scaberulous. Upper glume apex acute.

FLORETS Fertile florets female. Fertile lemma lanceolate; 3.8–4.5 mm long; 0.6–0.7 mm wide; membranous; keeled; 5 -veined. Lemma midvein scaberulous. Lemma lateral veins obscure, or distinct. Lemma surface glabrous. Lemma apex acute. Palea keels scabrous. Apical sterile florets resembling fertile though underdeveloped.

FLOWER Lodicules 2; ovate; 0.6 mm long; membranous. Anthers 3; 2–2.5 mm long. Ovary glabrous.

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

DISTRIBUTION South America: southern South America.

NOTES Poeae. Soreng 2011.

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