Your help is appreciated.    We depend on donations to help keep this site free and up to date for you. Can you please help us?

Eragrostis

See list of 11 species in this genus

Eragrostis hirsuta (Michx.) Nees was reported from MA by Hitchcock and Chase (1950), but specimens are unknown. Reference: Peterson (2003a).

  • 1a. Plants extensively creeping by stolons, rooting at the nodes, forming mats; inflorescence 1–3.5 (–6) cm tall
  • 1b. Plants without stolons, the stems erect or ascending, sometimes decumbent at the base, not rooting at the nodes; inflorescence (3–) 4–40 (–60) cm tall
    • 2a. Leaf blades with elevated glands or glandular pits along the margin [Fig. 225]
      • 3a. Lemmas 1.5–2 mm long, lacking glandular pits along the keel (rarely with 1 or 2 obscure glands); sheaths pubescent on the margin and often near the apex; spikelets 4–7 (–11) mm long, with 7–12 (–20) florets
      • 3b. Lemmas 2–2.8 mm long, with 1–3 glandular pits along the keel; sheaths glabrous along the margin, sometimes pubescent near the apex; spikelets 6–20 mm long, with 10–40 florets
    • 2b. Leaf blades without glands along the margin
      • 4a. Plants perennial, with basal innovations, sometimes with short, knobby rhizomes
        • 5a. Plants with short, knobby rhizomes; inflorescence usually more than 40% of the total plant height; anthers 0.3–0.5 mm long; paleas falling with the lemmas during spikelet disarticulation
        • 5b. Plants without rhizomes; inflorescence usually less than 40% of the total plant height; anthers 0.5–1.2 mm long; paleas usually not falling with the lemmas and persistent on the rachilla during spikelet disarticulation
          • 6a. Lemmas 1.6–2.2 mm long, usually rounded on the abaxial surface and hardly keeled, with inconspicuous lateral veins; upper glume 1.3–2 mm long; caryopsis red-brown, opaque; ligules 0.2–0.4 mm long
          • 6b. Lemmas 1.8–3 mm long, keeled on the abaxial surface, with conspicuous lateral veins; upper glume 2–3 mm long; caryopsis light brown, transluscent; ligules 0.6–1.3 mm long
      • 4b. Plants annual, from fibrous roots, without basal innovations or rhizomes
        • 7a. Panicle large and diffuse, (10–) 15–45 (–55) cm tall and usually more than 50% 
of the total plant height; pedicels (4–) 5–25 mm long; spikelets with 2–5 (–7) florets
        • 7b. Panicle often smaller, 4–20 (–28) cm tall (up to 40 cm in E. mexicana) and usually less than 50% of the total plant height; pedicels 1–7 (–10) mm long; spikelets with 5–22 florets (with only 3–6 florets in E. frankii)
          • 8a. Spikelets with 3–6 florets, narrow-ovate to ovate in broad outline at maturity; plants often with glandular pits on the sheaths, below the nodes of the stem, on the rachis of the inflorescence, and/or on the panicle branches
          • 8b. Spikelets with 5–22 florets, narrow-lanceolate to broad-lanceolate in broad outline at maturity; plants lacking glandular pits (rarely with a few scattered glandular pits on the stems in E. pilosa)
            • 9a. Caryopsis with a shallow to deep, longitudinal groove running the entire length; leaf blades (2–) 3–7 (–9) mm wide
            • 9b. Caryopsis without a longitudinal groove; leaf blades 1–3 (–4.5) mm wide
              • 10a. Lower glume 0.3–0.6 (–0.8) mm long, less than ½ as long as the lowest lemma [Fig. 227]; branches of the panicle usually whorled at the 2 lowest nodes; paleas mostly deciduous with the lemmas and not persistent on the rachilla; lemmas with inconspicuous, lateral veins
              • 10b. Lower glume 0.5–1.1 mm long, ½ or more as long as the lowest lemma [Fig. 226]; branches of the panicle usually solitary or paired at the lowest 2 nodes; paleas persistent on the rachilla after the lemmas have fallen; lemmas with conspicuous, lateral veins

Show All Couplets

 Show photos of:   Each photo represents one species in this genus.