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Descriptions

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

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

Nassella stuckertii

HABIT Perennial; caespitose. Basal innovations intravaginal. Culms erect; 30–95 cm long; 3–4 -noded. Culm-internodes terete; distally pubescent. Culm-nodes flush with internodes; glabrous. Lateral branches lacking. Leaf-sheaths scaberulous; outer margin hairy. Ligule an eciliate membrane; 4–10 mm long; glabrous on abaxial surface; entire, or lacerate; acute. Leaf-blades filiform; convolute; 14–38 cm long; 0.4–0.6 mm wide. Leaf-blade surface ribbed; puberulous; hairy adaxially.

INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf; with 1–3 peduncles per sheath.

Panicle open; linear; 10–40 cm long. Panicle branches scaberulous.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 6.5–8 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus brief; 0.3–0.4 mm long; pubescent; obtuse.

GLUMES Glumes persistent; similar; subequal in width; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 6.5–8 mm long; 1.1 length of upper glume; membranous; without keels; 3 -veined. Lower glume primary vein scaberulous. Lower glume apex attenuate, or setaceously attenuate. Upper glume lanceolate; 5.5–7 mm long; membranous; without keels; 3 -veined. Upper glume primary vein scaberulous. Upper glume apex attenuate, or setaceously attenuate.

FLORETS Fertile lemma elliptic; laterally compressed; 2.5–4 mm long; coriaceous; without keel; 5 -veined. Lemma surface pilose; hairy below. Lemma margins convolute; covering most of palea. Lemma apex awned; 1 -awned. Principal lemma awn bigeniculate; 21–35 mm long overall; with twisted column. Middle segment of lemma awn 4–6 mm long. Column of lemma awn 5–9 mm long. Palea 1 mm long; 0 -veined; without keels. Palea surface glabrous.

FLOWER Lodicules 2; 0.5 mm long. Anthers 3. Stigmas 2. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; fusiform; 1.8–2 mm long; dark brown. Hilum linear; 0.66–0.75 length of caryopsis.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Caro 1995.

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