Jepson eFlora
Key to families | Table of families and genera

Key to Malacothamnus

View taxon page for Malacothamnus

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

1. Inflorescence head-like ..... M. palmeri

2. Involucre bracts 20 mm wide, often > petals; leaf ± glabrous adaxially ..... var. involucratus

2' Involucre bracts 12–13 mm wide, ± = petals; leaf hairy adaxially ..... var. palmeri

1' Inflorescence spike- or panicle-like

3. Inflorescence spike- or panicle-like

4. Hairs white; branches ± erect

5. Branches slender; leaves 3–5-lobed; flowers < 10 per node ..... M. clementinus

5' Branches stout; leaves shallowly 5-lobed; flowers 3–5 per node ..... M. fremontii

4' Hairs ± yellow; branches spreading or ± erect

6. Branches slender; leaves thin

7. Leaves sparsely short-hairy adaxially, long-shaggy-hairy abaxially, 3–5-lobed; flowers generally >= 10 per node; flowering stalks 10–15 mm; calyx hairs <= 3 mm ..... M. densiflorus

7' Leaves densely hairy, unlobed to ± 3–5-lobed; flowers 3–6 per node; flowering stalks < 4 mm; calyx hairs < 1 mm ..... M. marrubioides

6' Branches stout; leaves thick

8. Leaf 3–5-lobed, abaxially veins ± not raised, hairs not denser; flowers generally ± 10 per node; leaf-like bracts many ..... M. aboriginum

8' Leaf unlobed to obscure-3-lobed, abaxially veins raised, hairs denser; flowers 3–6 per node; leaf-like bracts 3–5 ..... M. orbiculatus

3' Inflorescence panicle-like

9. Hairs ± yellow; stellate hairs with < 10 rays ..... M. davidsonii

9' Hairs white; stellate hairs with > 25 rays

10. Bractlets black in age ..... M. jonesii

10' Bractlets not black in age

11. Branches spreading or ± erect

12. Leaf blade < 5 cm, veins prominent abaxially, hairs adaxially ± = abaxially ..... M. abbottii

12' Leaf blade <= 7 cm, veins ± prominent abaxially, hairs adaxially < abaxially ..... M. hallii

11' Branches spreading ..... M. fasciculatus

13. Calyx lobes deltate to cordate; stellate hairs with long rays, especially on leaves abaxially; flowering stalks stout ..... var. catalinensis

13' Calyx lobes awl-shaped to lanceolate; stellate hairs with short rays; flowering stalks slender

14. Leaf hairs adaxially ± = abaxially; filament column ± 1/2 petals ..... var. fasciculatus

14' Leaf hairs ± 0 or adaxially > abaxially; filament column > 1/2 petals

15. Leaves thick, blade < 7 cm, shallowly lobed, adaxially ± glabrous ..... var. nesioticus

15' Leaves thin, blade < 8 cm, deeply lobed, adaxially ± hairy ..... var. nuttallii

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Citation for the whole project: Jepson Flora Project (eds.) [year] Jepson eFlora, http://ucjeps.berkeley.edu/IJM.html [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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