Jepson eFlora: Key page
Vascular Plants of California
Key to families | Table of families and genera
    Index to accepted names and synonyms:
| A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
   
   

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; basal leaves generally persistent, largest leaf blades ± , not flat ..... C. douglasii var. douglasii

3' Generally subshrub; proximal hairs (especially stems) ± felty, ± white, persistent; basal leaves generally 0, largest leaf blades ± , ± flat

4. Longest phyllaries 10–13 mm, outer ± tomentose, 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 ± basal; heads ± scapose, 1(3) per stem; plants cespitose 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 leaf blades ± deltate 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 leaf blades ± elliptic or  to ± , not flat; 1° lobes (4)5–18+ pairs, tips curled and/or twisted

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

8' Largest leaf blades cylindric to ± fusiform; 1° lobes (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; leaf blades (except Chaenactis macrantha) not gland-pitted; heads discoid or radiant

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

10. Phyllary tips  or scarcely , ± flat, ± green; leaf  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; leaf lobe tips ± cylindric; receptacle paleate; fruit not compressed; longest inner fruit pappus scales generally 3–5 mm ..... C. carphoclinia

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

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

9' Proximal hairs cobwebby to woolly or 0; largest leaf blades , or ± elliptic (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 leaf blades entire or 1-pinnately lobed, lobes generally 1–2(5) pairs; outer phyllaries ± glabrous in fruit, tip acute ..... C. fremontii

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

13' Heads discoid; peduncle nonglandular; outer corollas , spreading 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; leaf blades ± gland-pitted under hairs ..... C. macrantha

15' Corolla open during day, anthers ; inner corolla 4–10 mm, ± = fruit; leaf 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 tomentose to woolly, ± white; leaves ± basal, persistent ..... var. lanosa

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

19. Largest leaf blades generally 2-pinnately lobed, fleshy; stem ± spreading; SCo, coastal dunes, bluffs ..... var. orcuttiana

19' Largest leaf blades 1(2)-pinnately lobed, scarcely fleshy; stem erect 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

 

Contact/Feedback

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 .

We encourage links to these pages, but the content may not be downloaded for reposting, repackaging, redistributing, or sale in any form, without written permission from The Jepson Herbarium.