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

Key to Isocoma

View taxon page for Isocoma

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

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

1. Phyllary tip swollen, with a prominent  to widely  resin gland (resin glands rarely >= 2), often with additional minute dot-like resin glands

2. Leaves all  or proximal leaves toothed or lobed ..... I. acradenia (2)

3. Phyllary tips rounded and not or occasionally weakly soft-pointed; flowers 18–24 ..... var. acradenia

3' Phyllary tips blunt to  (inner ones), abruptly soft-pointed; flowers 20–27 ..... var. bracteosa (2)

2' Leaves all toothed or pinnately lobed

4. Flowers 10–13; phyllaries minutely awn-tipped ..... I. arguta (2)

4' Flowers 12–27; phyllaries rounded and not or minutely awn-tipped ..... I. acradenia (2)

5. Flowers 20–27; phyllaries abruptly soft-pointed ..... var. bracteosa (2)

5' Flowers 12–20; phyllaries rounded and not awn-tipped or very weakly awn-tipped ..... var. eremophila

1' Phyllary tip dotted with minute resin glands (rarely with >= 1 weakly developed larger resin glands)

6. Flowers 10–13; phyllaries minutely awn-tipped ..... I. arguta (2)

6' Flowers 15–28; phyllaries acute, not at all awn-tipped, or with weakly developed projection at tip ..... I. menziesii

7. Leaf oblong-oblanceolate to widely obovate, coarsely , ± thick, fleshystem and leaves glabrous, glandless – plants  or  ..... var. sedoides

7' Leaf linear, narrowly , or oblanceolate to obovate, entire, toothed, or shallowly lobed, not fleshy (or if fleshy, at least stem long-soft hairy); stem and leaves glabrous to long-soft hairy, , or glandular

8. Herbage stalked-glandular, without nonglandular hairs or finely and closely ± gray cobwebby-tomentose

9. Plant prostrate or decumbent to ± ; leaves 2–4 mm wide; heads in ± flat-topped or panicle-like cluster; fruit generally 2.3–3.6 mm; s SCo, s ChI, s PR ..... var. decumbens (2)

9' Plant strictly erect; leaves 4–10 mm wide; heads in ± flat-topped cluster; fruit generally 4–5 mm; s SnFrB, n SCoRI ..... var. diabolica (2)

8' Herbage not prominently glandular, otherwise glabrous to long-soft-hairy or tomentose

10. Plant prominently long-soft-hairy or tomentose

11. Herbage finely and closely gray tomentose; leaves narrowly oblanceolate, entire or few-toothed; stems decumbent to erect ..... var. decumbens (2)

11' Herbage with long,  ± thick-based hairs; leaves oblanceolate or oblong-oblanceolate, at least proximal leaves toothed along most of margin; stems generally erect ..... var. vernonioides (2)

10' Plant glabrous or slightly hairy, sometimes resinous

12. Leaves entire or few-toothed at tip ..... var. menziesii

12' At least proximal leaves serrate

13. Corolla 6–7 mm; fruit (3.8)4.5–5 mm ..... var. diabolica (2)

13' Corolla 5–7 mm; fruit 2.3–3.6 mm ..... var. vernonioides (2)



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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