Stipa atriseta

HABIT Perennial; caespitose; clumped densely. Culms erect; 30–60 cm long. Lateral branches lacking. Ligule an eciliate membrane. Leaf-blades involute, or convolute; 15–20 cm long; 1–2 mm wide; glaucous. Leaf-blade surface puberulous; hairy adaxially. Leaf-blade apex hardened.

INFLORESCENCE Inflorescence a panicle.

Panicle contracted; linear; 30 cm long.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 25–30 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus elongated; glabrous; pungent.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 1 length of upper glume; membranous; without keels. Lower glume apex acuminate. Upper glume lanceolate; 25–30 mm long; membranous; without keels. Upper glume apex acuminate.

FLORETS Fertile lemma lanceolate; subterete; 7–8 mm long; coriaceous; without keel; 5 -veined. Lemma surface puberulous; hairy below; hairy between veins. Lemma margins convolute; covering most of palea. Lemma apex surmounted by a ring of hairs; awned; 1 -awned. Principal lemma awn bigeniculate; 300 mm long overall; with twisted column; limb puberulous. Column of lemma awn 30 mm long; hirtellous. Palea 1 length of lemma; 2 -veined; without keels.

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

FRUIT Caryopsis with adherent pericarp; fusiform. Hilum linear.

DISTRIBUTION Asia-temperate: western Asia.

NOTES Stipeae. Fl Iran 1995.

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