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

Key to Tetradymia

View taxon page for Tetradymia

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

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

1. Stem unarmed (leaves not forming spines)

2. Flowers (5)6–9 per pappus 0 (but fruit covered with long, pappus-like hairs);   clusters generally 0 ..... T. comosa (2)

2' Flowers 4(5) per head; pappus present; axillary leaf clusters generally present

3. Main leaves  or silvery; clustered leaves ± (ob)lanceolate ..... T. canescens

3' Main leaves glabrous or sparsely tomentose; clustered leaves thread-like to linear-oblanceolate

4. Main leaves narrowly awl-shaped, stiffly  or , generally 5–10 mm; clustered leaves generally 3–10 mm, glabrous; fruit generally 3–4 mm, short-stiff-hairy; pappus of ± 100 bristles ..... T. glabrata

4' Main leaves ± thread-like, soft, 10–40 mm; clustered leaves generally 10–20 mm, loosely tomentose; fruit 5–6 mm, long-soft-hairy; pappus of ± 20 stiff bristles or slender scales (± hidden by fruit hairs) ..... T. tetrameres

1' Stem armed with spines derived from main leaves

5. Fruit glabrous, 2.5–3.5 mm ..... T. argyraea

5' Fruit ± long-soft-hairy, 4–8 mm

6. Main leaves narrowly (ob)lanceolate, finally deciduous, base not hardened; pappus 0 ..... T. comosa (2)

6' Main leaves  to tip, persistent as stout spines, base expanded, hardened; pappus present

7. Clustered leaves tomentose or silvery-hairy; fruit ± short-hairy; pappus of many fine bristles 9–12 mm ..... T. stenolepis

7' Clustered leaves ± glabrous; fruit densely long-hairy; pappus of ± 25 slender scales 6–9 mm

8. Spines sharply , 5–25 mm, tomentose;  generally 8–12 mm, ± bell-shaped; fruit generally 6–8 mm ..... T. spinosa

8' Spines straight, (1)2–5 cm, becoming glabrous; involucre generally 7–9 mm, obconic; fruit generally 4–5 mm ..... T. axillaris

9. Involucre and  glabrous; fruit hairs generally 6–8 mm ..... var. axillaris

9' Involucre and peduncle tomentose; fruit hairs generally 9–11 mm ..... var. longispina


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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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