Jepson eFlora
Key to families | Table of families and genera

Key to Muhlenbergia

View taxon page for Muhlenbergia

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Annual

2. Lemma awned, awn 1–3 cm, lemma 2.5–6 mm

3. Lemma generally 4.5–6 mm; inflorescence generally < 1.5 cm wide, branches closely appressed; glumes generally 1–2 mm ..... M. appressa

3' Lemma generally 2.5–4.5 mm; inflorescence 1–5 cm wide, branches spreading to ascending; glumes generally < 1 mm ..... M. microsperma (2)

2' Lemma short-awned, awn < 1 mm, or awn 0; lemma < 2.5 mm

4. Inflorescence narrow, < 1 cm wide; branches closely appressed; stems often rooting at lower nodes ..... M. filiformis (2)

4' Inflorescence open, 1.5–8 cm wide; branches reflexed, ascending to spreading; stems not rooting at lower nodes

5. Inflorescence branches stiffly spreading to reflexed ± 90° from axis; glumes glabrous; ligule teeth 2, 1 on each side ..... M. fragilis

5' Inflorescence branches ascending < 80° from axis; glume tip short-hairy; ligule truncate to obtuse, irregularly short-toothed ..... M. minutissima

1' Perennial herb

6. Lemma awn 0 or short-awned, awn < 1 mm

7. Inflorescence 5–14 cm wide, open, branches spreading ..... M. asperifolia

7' Inflorescence <= 4 cm wide, narrow, branches ascending to appressed, occasionally loosely spreading

8. Rhizomes creeping, ± scaly; stems ± decumbent to erect

9. Glumes 2.5–4 mm, ± = lemma; lower 1/2 lemma short-soft-hairy ..... M. californica (2)

9' Glumes 0.5–1.8 mm, ± 1/2 lemma; lemma glabrous to ± scabrous

10. Ligule generally 1–2.5 mm; inflorescence axis generally obscured by branches, spikelets ..... M. richardsonis

10' Ligule generally < 1 mm; inflorescence axis generally visible between branches ..... M. utilis

8' Rhizomes 0; stems clumped or decumbent and ± rooting at nodes

11. Blade < 4 cm; lemma generally < 2 mm; stem generally < 3 dm ..... M. filiformis (2)

11' Blade >= 5 cm; lemma generally > 2.5 mm; stem 2–15 dm

12. Inflorescence <= 15 cm, 1.5–4 cm wide; branches loosely flowered ..... M. jonesii

12' Inflorescence 15–60 cm, <= 1.2 cm wide; branches densely flowered ..... M. rigens

6' Lemma awn 1–30 mm

13. Inflorescence open, 6–15 cm wide, branches spreading ..... M. porteri

13' Inflorescence generally < 6 cm wide, branches ascending to appressed, occasionally spreading

14. Glumes 1 or 2, generally < 0.5 mm, vein 0 ..... [M. schreberi]

14' Glumes 2, generally > 0.5 mm, vein(s) evident

15. Rhizome generally scaly, creeping

16. Blade generally rolled, < 2 mm wide; anther purple, 1.5–3 mm

17. Lemma, palea short-soft-hairy on lower 1/2; stems loosely clumped, decumbent ..... M. arsenei (2)

17' Lemma base sparsely short-hairy; palea glabrous to ± scabrous; stems erect, ± rooting at lower nodes ..... M. pauciflora (2)

16' Blade generally flat, >= 2 mm wide; anther yellow, generally <= 1.5 mm

18. Hairs at lemma base 2–3.5 mm ..... M. andina

18' Hairs at lemma base < 1.5 mm

19. Lemma awn generally < 2.2 mm; anther 1–1.5 mm ..... M. californica (2)

19' Lemma awn 2.5–9 mm; anther < 0.5 mm ..... M. mexicana

15' Rhizomes 0

20. Upper glume 3-veined, 3-toothed ..... M. montana

20' Upper glume generally 1-veined, obtuse, acute, or awned

21. Lower glume 2-veined, 2-awned; inflorescence 5–8 mm wide, spike-like, dense ..... M. alopecuroides

21' Lower glume 1-veined, with 1 awn or awnless; inflorescence 5–30 mm wide, dense to loose

22. Glumes 0.5–1 mm, obtuse; cleistogamous spikelets generally present in lowermost stem axils ..... M. microsperma (2)

22' Glumes generally 1.5–3.5 mm, acute, acuminate, or awned; cleistogamous spikelets 0

23. Lemma, palea short-soft-hairy on lower 1/2; stems loosely clumped, decumbent ..... M. arsenei (2)

23' Lemma base sparsely short-hairy; palea glabrous to ± scabrous; stems erect, ± rooting at lower nodes ..... M. pauciflora (2)

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