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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 adamii

HABIT Perennial; caespitose; clumped densely. Culms erect; 25–45 cm long; 3 -noded. Culm-nodes glabrous. Leaf-sheaths mostly shorter than adjacent culm internode; scaberulous; glabrous on surface, or pubescent; outer margin hairy. Ligule a ciliolate membrane; 0.3–1 mm long; truncate, or obtuse. Leaf-blades filiform; convolute; 10–22 cm long; 0.4–0.7 mm wide. Leaf-blade surface pubescent; hairy adaxially.

INFLORESCENCE Inflorescence a panicle; embraced at base by subtending leaf.

Panicle contracted; linear; 10–16 cm long; bearing few spikelets. Primary panicle branches appressed; 1–2 -nate; bearing 1–2 fertile spikelets on each lower branch.

Spikelets solitary. Fertile spikelets pedicelled.

FERTILE SPIKELETS Spikelets comprising 1 fertile florets; without rhachilla extension. Spikelets lanceolate; subterete; 39–45 mm long; breaking up at maturity; disarticulating below each fertile floret. Floret callus evident; 1.4–1.7 mm long; acute; with elliptic scar.

GLUMES Glumes persistent; similar; exceeding apex of florets; thinner than fertile lemma. Lower glume lanceolate; 39–45 mm long; 1.1 length of upper glume; membranous; without keels. Lower glume primary vein scaberulous. Lower glume apex attenuate. Upper glume lanceolate; 36–44 mm long; 4 length of adjacent fertile lemma; membranous; without keels. Upper glume primary vein scaberulous. Upper glume surface pubescent, or pilose. Upper glume hairs 1.3–1.7 mm long. Upper glume apex attenuate.

FLORETS Fertile lemma lanceolate; subterete; 9–10 mm long; 0.8–1 mm wide; coriaceous; light green; without keel; 5 -veined. Lemma surface papillose; pilose; hairy below; hairy in lines; with conspicuous apical hairs. Lemma margins convolute; covering most of palea. Lemma hairs 0.3–0.5 mm long. Lemma apex awned; 1 -awned. Principal lemma awn geniculate; (91–)103–130 mm long overall; with (60–)80–100(–105) mm long limb; with twisted column; limb plumose; with 5.5–7 mm long hairs. Column of lemma awn (21–)23–27 mm long; hirsute; with 2–4 mm long hairs. Palea 1 length of lemma; without keels.

FLOWER Anthers 3; 4–5 mm long.

DISTRIBUTION Asia-temperate: Soviet Middle Asia.

NOTES Stipeae. Nobis 2011.

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