Jepson eFlora
Key to families | Table of families and genera

Key to Psorothamnus

View taxon page for Psorothamnus

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

1. Leaf simple, linear or oblanceolate (or leaflets 2–3)

2. Leaves persistent; inflorescence 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, included; inflorescence dense; pedicel 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, exserted; inflorescence ± open; pedicel bractlets 2

5. Fruit glands many, small, in longitudinal lines especially distally; leaves generally silvery-strigose; Mojave Desert, e Sonoran Desert, ..... P. fremontii

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

6' Leaflet narrowly elliptic to ovate or obovate, ± 1.5–3 mm wide; Mojave Desert ..... var. fremontii

5' Fruit glands few to several, large, scattered; leaves variously hairy, generally not strigose; East of Sierra Nevada to San Bernardino Mountains, Desert ..... 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


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].
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