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Descriptions

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

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

Stipa maeviae

HABIT Perennial; caespitose. Butt sheaths red; pilose. Culms 5–7 cm long; 2 -noded. Culm-internodes distally hirsute. Culm-nodes constricted. Leaf-sheaths longer than adjacent culm internode; pubescent. Ligule a ciliolate membrane; 2 mm long; 0.25–0.5 mm long on basal shoots; pubescent on abaxial surface; acute. Leaf-blades curved, or flexuous; conduplicate; 10–20 cm long; 1 mm wide; stiff. Leaf-blade surface glabrous; hairless except near base. Leaf-blade apex pungent.

INFLORESCENCE Inflorescence a panicle; comprising 6–7 fertile spikelets; shorter than basal leaves; embraced at base by subtending leaf.

Panicle open; oblong; 3 cm long; 1–1.5 cm wide; bearing few spikelets.

Spikelets solitary. Fertile spikelets pedicelled. Pedicels 3–7 mm long; villous.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 18–22 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; curved; 1.5–2 mm long; pubescent; acute.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 18–22 mm long; 1.05 length of upper glume; membranous; without keels; 1 -veined. Lower glume primary vein ciliate. Lower glume lateral veins absent. Lower glume surface puberulous. Lower glume apex acuminate. Upper glume lanceolate; 17–20 mm long; membranous; without keels; 3 -veined. Upper glume primary vein ciliate. Upper glume surface puberulous. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; subterete; 7–8 mm long; coriaceous; without keel; 5 -veined. Lemma surface villous. Lemma margins convolute; covering most of palea. Lemma hairs 3–4 mm long. Lemma apex dentate; 2 -fid; with lobes 2 mm long; awned; 1 -awned. Principal lemma awn from a sinus; geniculate; 16–20 mm long overall; with twisted column; limb glabrous. Column of lemma awn 7–9 mm long; plumose. Palea 2.6–3 mm long; 0 -veined; without keels.

FLOWER Lodicules 3. Anthers 3. Stigmas 2. Ovary glabrous.

FRUIT Caryopsis with adherent pericarp; fusiform. Hilum linear.

DISTRIBUTION South America: southern South America.

NOTES Stipeae. Fl Pat 1995.

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