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Vascular Plants of California
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Key to Chaenactis

View taxon page for Chaenactis

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

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

1. Perennial herb (biennial) or subshrub, rarely flowering 1st year; inner fruit pappus generally of 10–20 scales in 3–4 ± equal series  gland-pitted under hairsheads discoid (sect. Macrocarphus)

2. Leaves generally cauline (also  in Chaenactis douglasii); heads not , (1)2–25+ per stem; plants not or scarcely  or matted

3. Perennial herb or biennial, rarely flowering 1st year or slightly woodyproximal hairs cobwebby to , ± gray, thinning with age;  leaves generally persistent, largest  blades ± , not flat ..... C. douglasii var. douglasii

3' Generally subshrubproximal hairs (especially stems) ± felty, ± white, persistent leaves generally 0, largest  blades ± , ± flat

4. Longest phyllaries 10–13 mm, outer ± , not or scarcely glandular; e PR ..... C. parishii

4' Longest phyllaries 14–18 mm, outer generally glandular-hairy, other hairs 0 or scarce; e KR ..... C. suffrutescens (2)

2' Leaves ± heads ± , 1(3) per stem; plants  to ± matted

5. Outer phyllaries silky-tomentose, nonglandular ..... C. alpigena

5' Outer phyllaries generally glandular-hairy, often also cobwebby to woolly or shaggy-hairy

6. Largest  blades ±  to , ± flat; 1°  generally 2–4(5) pairs, tips ± flat

7. Plant 2–10(12) cm; leaves 2.5–5 cm; longest phyllaries 9–12(14) mm; corolla 5.5–8 mm; longest pappus scales 3–5 mm ..... C. nevadensis

7' Plant (10)25–45(60) cm; leaves 5–10 cm; longest phyllaries 14–18 mm; corolla 8.5–10 mm; longest pappus scales 7–9 mm ..... C. suffrutescens (2)

6' Largest  blades ±  or  to ± , not flat; 1°  (4)5–18+ pairs, tips curled and/or twisted

8. Largest  blades ± ; 1°  (4)5–9(12) pairs, not or scarcely overlapping ..... C. douglasii var. alpina

8' Largest  blades  to ± ; 1°  (7)10–18+ pairs, ± overlapping ..... C. santolinoides

1' Annual; inner fruit pappus 0, crown-like, or of 4(5) or (7)8 scales in 1 or 2 unequal series, outer << inner;  blades (except Chaenactis macrantha) not gland-pitted; heads discoid or radiant

9. Proximal hairs mealy, scaly, or powdery; largest  blades generally ± , (2)3–4-pinnately lobed (sect. Acarphaea)

10. Phyllary tips  or scarcely , ± flat, ± green;   tips ± flat; receptacle epaleate; fruit pappus 0 or longest scales <= 0.5 mm ..... C. artemisiifolia

10' All or inner phyllary tips long-acuminate, needle-like, ± red;   tips ± receptacle paleatefruit not ; longest inner fruit pappus scales generally 3–5 mm ..... C. carphoclinia

11. Leaves  and cauline, longest 1–6(7) cm;  slender, flexible, base scarcely enlarged ..... var. carphoclinia

11' Leaves generally , longest 7–10 cm;  thick, stiff, base strongly enlarged ..... var. peirsonii

9' Proximal hairs cobwebby to woolly or 0; largest  blades , or ±  (to ovate), 1–2-pinnately lobed (sect. Chaenactis)

12. Corolla white to ± pink or rarely pale yellow; generally in or near GB, D

13. Heads radiant distally generally glandular-hairy, or ± glabrous in fruit; outer corollas , > inner; inner fruit pappus generally of 4 scales in 1 series

14. Longest pappus 6–8.5 mm, exceeding corolla, tips visible among proximal hairs 0 by flowering time; largest  blades  or 1-pinnately lobed,  generally 1–2(5) pairs; outer phyllaries ± glabrous in fruit, tip  ..... C. fremontii

14' Longest pappus 1.5–6 mm, not exceeding corolla, tips hidden; proximal hairs persisting at least at  by flowering time; largest  blades generally 1–2-pinnately lobed, 1°  4–8 pairs; outer phyllaries glandular-hairy and/or ± cobwebby in fruit, tip ±  ..... C. stevioides

13' Heads discoid;  nonglandular; outer corollas  or not, ± = inner; pappus of (6)8 scales in 2 unequal series, outer << inner

15. Corolla open at night, anthers ± ; inner corollas 9–12(15) mm, 1.8–2.2 × fruit blades ± gland-pitted under hairs ..... C. macrantha

15' Corolla open during day, anthers ; inner corolla 4–10 mm, ± = fruit blades not gland-pitted

16. Longest phyllaries 10–18 mm, outer nonglandular, glabrous proximally, densely  distally, tip generally , flexible; pappus scales 8 ..... C. xantiana

16' Longest phyllaries 4.5–10(12) mm, outer generally glandular-hairy, hairs otherwise various, uniform, tip , stiff; pappus scales generally < 8 (hybrids; see genus note)

12' Corolla bright to dark yellow; generally CA-FP ..... C. glabriuscula

17. Inner fruit pappus generally of 7–8 scales in 2 series, outer << inner ..... var. heterocarpha

17' Inner fruit pappus generally of 4 scales in 1 series

18. Proximal hairs  to woolly, ± white; leaves ± persistent ..... var. lanosa

18' Proximal hairs 0 or ± cobwebby, ± gray; leaves  (withering) and cauline

19. Largest  blades generally 2-pinnately lobed, fleshystem ± ; SCo, coastal dunes, bluffs ..... var. orcuttiana

19' Largest  blades 1(2)-pinnately lobed, scarcely fleshystem  to ; inland from coast

20. Longest phyllaries 5–7 mm, 1–2 mm wide, outer ± silky-cobwebby at least medially in fruit, often also ± glandular-hairy; longest pappus 2–4 mm, 0.4–0.7 × corolla ..... var. glabriuscula

20' Longest phyllaries 7–9 mm, 2–3 mm wide, outer becoming glabrous in fruit; longest pappus generally 5–8 mm, ± 0.9(1) × corolla ..... var. megacephala

 

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