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

Key to Psorothamnus

View taxon page for Psorothamnus

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

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

1. Leaf  or oblanceolate (or leaflets 2–3)

2. Leaves persistentinflorescence axis not ending as thorn ..... P. schottii

2' Leaves deciduous by early summer; inflorescence axis ending as thorn ..... P. spinosus

1' Leaves odd-1-pinnate or some simple

3. Fruit 2–4.5 mm, ; inflorescence dense bractlets 0

4. Terminal leaflets > lateral or not; glands of twigs << 0.5 mm wide ..... P. emoryi

4' Terminal leaflets ± = lateral; glands of twigs ± 0.5 mm wide ..... P. polydenius

3' Fruit 7–10 mm, ; inflorescence ± open; pedicel bractlets 2

5. Fruit glands many, small, in longitudinal lines especially distallyleaves generally silvery-strigose; DMoj, e DSon, ..... P. fremontii

6. Leaflet linear, < ± 1 mm wide; e DSon ..... var. attenuatus

6' Leaflet narrowly  to  or obovate, ± 1.5–3 mm wide; DMoj ..... var. fremontii

5' Fruit glands few to several, large, scattered; leaves variously hairy, generally not ; SNE to SnBr, D ..... P. arborescens

7. Leaflets generally continuous with axis, silky-hairy ..... var. simplicifolius

7' Leaflets generally (or at least some) jointed to axis, glabrous to hairy, including silky-hairy or not

8. Calyx 7–9 mm, sparsely to densely hairy ..... var. arborescens

8' Calyx 5–7 mm, hairs 0 or sparse ..... var. minutifolius


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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 .

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