Jepson eFlora
Key to families | Table of families and genera

Key to Festuca

View taxon page for Festuca

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

1. Inflorescence spike-like (sometimes sparingly branched); glume 1 except 0 in uppermost spikelet (subg. Lolium)

2. Glume < rest of spikelet; lower lemma firmly membranous, flat to rounded at base ..... F. perennis

2' Glume >= rest of spikelet; lower lemma becoming hard and thick at base ..... F. temulenta

1' Inflorescence panicle-like, branches dense and appressed to open and spreading, or raceme-like; glumes 2, lower sometimes minute

3. Dioecious; spikelets staminate or pistillate; reduced, sterile pistils sometimes present (subg. Leucopoa) ..... F. kingii

3' Bisexual; florets generally bisexual

4. Leaf blade with prominent claw-like or clasping basal auricles (subg. Schedonorus)

5. Auricles hairy (sometimes reduced to only 1 or 2 hairs); lemma generally minutely hairy, awn 0.5–4 mm or 0 ..... F. arundinacea

5' Auricles glabrous; lemma generally smooth, awn << 0.5 mm or 0 ..... F. pratensis

4' Leaf blade generally without prominent claw-like, clasping basal auricles (inconspicuous flap-like auricles sometimes present)

6. Annual; stamen 1 (subg. Vulpia)

7. Lower glume generally < 2 mm, < 1/2 upper glume, sometimes minute ..... F. myuros

7' Lower glume generally > 3 mm, >= 1/2 upper glume (2–3 mm, < 1/2 upper glume in some Festuca microstachys)

8. Florets (5)7–12, closely overlapping, spikelet axis hidden; lemma awn 0.5–5 mm ..... F. octoflora

8' Florets generally 1–7, loosely overlapping, spikelet axis visible, each internode > 1 mm; lemma awn 3.5–12 mm

9. Lowest inflorescence branches appressed to erect at maturity; branches without basal swellings ..... F. bromoides

9' Lowest inflorescence branches spreading or reflexed at maturity; branches with basal swellings ..... F. microstachys

6' Perennial herb; stamens generally 3 (subg. Festuca)

10. Leaf sheath closed, ± red, hairs ± downward-pointing ..... F. rubra

10' Leaf sheath open at least 1/2 its length, generally green, glabrous or hairy, hairs not downward-pointing

11. Florets long-stalked, spikelet axis jointed below florets ..... F. subuliflora

11' Florets not long-stalked, spikelet axis not jointed

12. Leaf blade generally (1)2–10 mm wide, flat or rolled longitudinally

13. Collar generally densely hairy (glabrous); lemma awn (0)1.5–2.5 mm, generally < 1/3 lemma; plants densely cespitose, with persistent dead leaf sheaths at base ..... F. californica (2)

13' Collar glabrous; lemma awn 2–20 mm, generally > 1/3 lemma; plants loosely cespitose, dead leaf sheaths inconspicuous or 0

14. Lemma distinctly 5-veined, awned from between 2 short teeth ..... F. elmeri

14' Lemma indistinctly veined, awn terminal ..... F. subulata

12' Leaf blade < 2.5 mm wide, folded or rolled inward toward upper side

15. Collar generally densely hairy, rarely glabrous; plants densely cespitose, with persistent dead leaf sheaths at base ..... F. californica (2)

15' Collar glabrous; plants loosely to densely cespitose, without persistent dead leaf sheaths at base (except Festuca idahoensis)

16. Lemma awns 3–12 mm

17. Ovary tip glabrous; awn < lemma body; leaf blade often glaucous or ± blue ..... F. idahoensis

17' Ovary tip hairy; awn generally > lemma body; leaf blade green ..... F. occidentalis

16' Lemma awns 0–2.5 mm

18. Spikelets 9–12 mm; lower cauline leaf blades much shorter and stiffer than the upper ..... F. viridula

18' Spikelets 2.5–9 mm; upper and lower cauline leaf blades similar

19. Anthers when dry 2–3.5 mm; plants of forested sites, generally 1100–1800 m ..... F. trachyphylla

19' Anthers when dry 0.5–2 mm; plants of subalpine or lower alpine habitats, generally > 3000 m

20. Anthers 0.9–1.2 mm when dry ..... F. saximontana

20' Anthers 0.4–0.8(0.9) mm when dry

21. Inflorescence branches at lowest node 0–1; ovary tip glabrous ..... F. brachyphylla subsp. breviculmis

21' Inflorescence branches at lowest node (1)2 or 3; ovary tip sparsely short-hairy ..... F. minutiflora


Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, [accessed on month, day, year]
Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on [month, day, year].
We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.