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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 wilhelminae

HABIT Perennial; caespitose. Stolons absent, or present. Butt sheaths persistent and investing base of culm; with fibrous dead sheaths. Basal innovations extravaginal. Culms 15–30 cm long. Leaf-sheaths 0.5–3.7 cm long; smooth; glabrous on surface. Ligule an eciliate membrane; 2.25–3.5 mm long; erose; acute. Leaf-blades erect; flat, or conduplicate; 2.3–9 cm long; 1.6–3.5 mm wide; stiff. Leaf-blade surface glabrous. Leaf-blade apex abruptly acute.

INFLORESCENCE Inflorescence a panicle. Peduncle 10–22 cm long; smooth.

Panicle open; ovate; 5.5–8 cm long; 3.7–4 cm wide. Primary panicle branches ascending; 2–4 -nate; 2.5–3.8 cm long; bearing 3–7 fertile spikelets on each lower branch. Panicle branches stiff; scabrous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1–2 fertile florets; with a barren rhachilla extension. Spikelets ovate; laterally compressed; 3.75–5.25 mm long; breaking up at maturity; disarticulating below each fertile floret. Rhachilla internodes 0.5–1.1 mm long; smooth. Floret callus woolly.

GLUMES Glumes persistent; similar; shorter than spikelet. Lower glume oblong, or ovate; 2.25–2.75 mm long; 0.9 length of upper glume; membranous; 1-keeled; 1–3 -veined. Lower glume primary vein scabrous. Lower glume lateral veins absent, or distinct. Lower glume apex acute. Upper glume oblong; 2.65–2.9 mm long; 0.75 length of adjacent fertile lemma; membranous; 1-keeled; 3 -veined. Upper glume primary vein scabrous. Upper glume apex emarginate to acute.

FLORETS Fertile lemma ovate; 3.5–4 mm long; membranous; keeled; 5 -veined. Lemma lateral veins obscure. Lemma surface scabrous; rough on veins. Lemma apex acute. Palea 1 length of lemma. Palea keels scabrous; adorned above. Rhachilla extension 1.5–2.25 mm long.

FLOWER Lodicules 2; membranous. Anthers 3; 1–1.4 mm long; yellow.

FRUIT Caryopsis with adherent pericarp. Hilum punctiform.

DISTRIBUTION Asia-tropical: Papuasia.

NOTES Poeae. Alp Fl N Guin 1994.

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