Psathyrostachys Nevski ex Roshev.

First published in V.L.Komarov (ed.), Fl. URSS 2: 712 (1934)
This genus is accepted
The native range of this genus is E. Europe to Siberia and N. China, Türkiye to Central Asia and Pakistan.

Descriptions

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Morphology General Habit
Perennial. Rhizomes absent (7), or short (3), or elongated (1). Culms 15-49.45-110 cm long. Leaf-sheath auricles absent (6), or falcate (6). Ligule an eciliate membrane.
Morphology Reproductive morphology Inflorescences
Inflorescence composed of racemes. Racemes single; linear (10), or oblong (3); bilateral. Rhachis fragile at the nodes. Spikelet packing broadside to rhachis (10/10). Rhachis internodes indefinite (1), or linear (2), or cuneate (8); falling with spikelet above (10/10). Spikelets ascending (1/1); in pairs (4), or in threes. Fertile spikelets sessile; 2 in the cluster (4), or 3 in the cluster; subequal (5/7), or the central smaller (2/7).
Morphology Reproductive morphology Inflorescences Spikelets
Spikelets comprising 1 fertile florets, or 2 fertile florets (6), or 3 fertile florets (2); without rhachilla extension (1), or with a barren rhachilla extension (9), or with diminished florets at the apex (1). Spikelets lanceolate (10), or elliptic (1); dorsally compressed; 5.5-12.18-28 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus pubescent (1/1). Rhachilla internodes brief up to lowest fertile floret (10), or elongated below proximal fertile floret (1).
Fertile
Spikelets comprising 1 fertile florets, or 2 fertile florets (6), or 3 fertile florets (2); without rhachilla extension (1), or with a barren rhachilla extension (9), or with diminished florets at the apex (1). Spikelets lanceolate (10), or elliptic (1); dorsally compressed; 5.5-12.18-28 mm long; falling entire; deciduous with accessory branch structures. Spikelet callus pubescent (1/1). Rhachilla internodes brief up to lowest fertile floret (10), or elongated below proximal fertile floret (1).
Morphology Reproductive morphology Inflorescences Bracts Glume
Glumes collateral; reaching apex of florets (1), or exceeding apex of florets (10); gaping. Lower glume subulate; 1 length of upper glume. Lower glume surface smooth (5), or scabrous (6); glabrous (5), or puberulous (1), or pubescent (1), or pilose (6), or villous (1). Upper glume subulate. Upper glume surface smooth (5), or scabrous (6); glabrous (5), or puberulous (1), or pilose (6), or villous (1).
Morphology Reproductive morphology Flowers Florets
Fertile lemma lanceolate; coriaceous; without keel; 5 -veined (1/9), or 7 -veined (8/9). Lemma midvein without distinctive roughness (10), or scabrous (1). Lemma lateral veins prominent (1/1). Lemma surface smooth (10), or scaberulous (1), or scabrous (1); glabrous (5), or puberulous (1), or pubescent (2), or pilose (6). Lemma margins eciliate (10), or ciliolate (1). Lemma apex entire (10), or lobed (1); 2 -fid (1/1); acuminate (10/10); awned; 1 -awned. Principal lemma awn apical (10), or from a sinus (1); straight (10), or curved (1); limb glabrous (10), or ciliate (1). Palea membranous (1), or coriaceous (10). Palea keels smooth (8), or scaberulous (2), or scabrous (1). Palea surface glabrous (9), or pubescent (1), or pilose (2). Apical sterile florets 1 in number (1/1); barren (1/1); linear (1/1).
Morphology Reproductive morphology Flowers
Anthers 3 (1/1). Ovary unappendaged (10), or beaked (1); pubescent on apex (10/10).
Morphology Reproductive morphology Fruits
Caryopsis with adherent pericarp (10/10). Hilum linear (10/10); 1 length of caryopsis.
Distribution
Europe (1), or Temperate Asia, or South America (1).
[GB]

Sources

  • GrassBase - The Online World Grass Flora

    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2022. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2022. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2022 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0