Jepson eFlora: Key page
Vascular Plants of California
Key to families | Table of families and genera

Key to Sporobolus

View taxon page for Sporobolus

(For a list of species in Sporobolus, use the above link.)

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

1. Annualinflorescence 1–5 cm, terminal and  at ± most stem ; upper  2.5–5 mm;  leathery, tip beaked ..... S. vaginiflorus

1' Perennial herb; inflorescence 8–80 cm, generally terminal, sometimes axillary at some stem nodes; upper glume 0.5–3 mm; lemma membranous, tip  to 

2. Sheath collar with conspicuous hairs to 4 mm; glume back keeled, upper glume midvein ± scabrous at 20×

3. Lower 1° inflorescence branches generally < 2 cm, bearing 2° inflorescence branches and  to near base ..... S. contractus

3' Lower 1° inflorescence branches > 3 cm, bearing 2° inflorescence branches and spikelets along upper 3/4, base naked

4. 2°, 3° inflorescence branches weakly  or , ± obscure ..... S. cryptandrus

4' 2°, 3° inflorescence branches spreading, evident, entangled ..... S. flexuosus

2' Sheath collar glabrous or with sparse long hairs to 6 mm; glume back rounded, upper glume midvein ± smooth at 20×

5. Upper glume length < 0.6 × lemma, tip obtuse, minutely toothed; anthers 0.5–1.1 mm ..... S. indicus

5' Upper glume length > 0.6 × lemma, tip acute, ; anthers 1.1–1.8 mm

6. Stem generally 3–10 dm, to ± 3 mm thick at base; 2° inflorescence branches spreading, bearing spikelets distally, base naked, 3° inflorescence branches spreading ..... S. airoides

6' Stem generally 9–25 dm, to ± 9 mm thick at base; 2° inflorescence branches weakly spreading or appressed, bearing spikelets to near base, 3° inflorescence branches appressed ..... S. wrightii


Please use this Google Form for Contact/Feedback

Citation for the whole project: Jepson Flora Project (eds.) . Jepson eFlora, [accessed on ]

Citation for an individual treatment: [Author of taxon treatment] [year]. [Taxon name] in Jepson Flora Project (eds.) Jepson eFlora, [URL for treatment]. Accessed on .

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.