GrassBase - The Online World Grass Flora


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

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

Stipa petriei

HABIT Perennial. Basal innovations extravaginal. Culms erect; 30–60 cm long; wiry. Culm-internodes smooth. Culm-nodes purple; glabrous. Lateral branches lacking, or sparse. Leaf-sheaths 1–3 cm long; glabrous on surface, or pubescent; with reflexed hairs. Leaf-sheath oral hairs lacking, or pubescent. Leaf-sheath auricles erect; 0.5–1 mm long. Ligule an eciliate membrane; 0.3–0.5 mm long. Leaf-blades aciculate; involute; 15–30 cm long; 0.8 mm wide; stiff. Leaf-blade surface pubescent; hairy adaxially.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 15–25 cm long. Panicle axis scabrous. Panicle branches scabrous.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels scabrous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets linear; subterete; 5–7 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus brief; 0.1–0.3 mm long; pilose; acute; disarticulating obliquely. Floret callus hairs 1 mm long.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma; shiny. Lower glume lanceolate; 5–7 mm long; hyaline; without keels; 1 -veined. Lower glume lateral veins absent. Lower glume apex setaceously attenuate. Upper glume lanceolate; 5–7 mm long; hyaline; without keels; 3 -veined. Upper glume lateral veins obscure. Upper glume apex setaceously attenuate.

FLORETS Fertile lemma linear; subterete; 3–5 mm long; membranous; without keel; 3–5 -veined. Lemma surface pubescent. Lemma margins flat; interlocking with palea keels. Lemma apex awned; 1 -awned. Principal lemma awn curved; 30–40 mm long overall; with a straight or slightly twisted column. Column of lemma awn 5–10 mm long; puberulous. Palea 1 length of lemma; 2 -veined; without keels. Palea surface pilose; hairy on back; hairy above.

FLOWER Lodicules 3; 0.5–1 mm long. Anthers 3; 1.7 mm long; eventually exserted; anther tip penicillate. Stigmas 2.

FRUIT Caryopsis with adherent pericarp; 2.5–3.5 mm long. Hilum linear.


DISTRIBUTION Australasia: New Zealand.

NOTES Stipeae. FL NZ 2001.

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