Key to the genera of the Inuleae

1.

Plants dioecious; individual capitula homogamous (occasionally polygamously-dioecious in Antennaria)

2

 

Plants monoecious; individual capitula heterogamous or homogamous with perfect florets

4

2. (1)

Shrubs or erect subshrubs; stems flattened laterally; leaves laterally compressed, green or more often ferruginous; achenes glabrous or with 2-seriate glandular-stipitate hairs (cf. L. graveolens)

Loricaria

 

Annual herbs or rhizomatous perennials, erect or more commonly caespitose or suffruticose; stems cylindrical; leaves flat and not laterally compressed; achenes glabrous or pubescent with glandular-stipitate biseriate hairs

3

3. (2)

Internodes very short and stems compressed into dense 'cojines'; leaves densely imbricate, adpressed on the stems and usually ovate to obovate; capitula sessile

Mniodes

 

Internodes and stems differentiated; leaves not densely imbricate or adpressed to stems; capitula on inflorecences above leaves

Antennaria

4. (1)

Upper part of style and outside of style arms pubescent; style arms linear and bifurcate or shortly bifid

5

 

Upper part of style glabrous

8

5. (4)

Capitula forming dense glomerules or arranged in dense spikes; stems winged, wings discolorous

Pterocaulon

 

Capitula solitary or congested but never in spikes or spherical glomerules; stems usually wingless, if winged wings concolorous

6

6. (5)

Trees; male florets solitary; carpopodium inconspicuous; corolla contracted with short basal tube

Tessaria

 

Herbs or shrubs; male florets few to several, never solitary; carpopodium conspicuous and annular; corolla lacking distinct basal tube or basal tube long

7

7. (6)

Pappus setae fused at base, often falling as unit; hermaphrodite florets functionally male, achenes poorly developed

Pluchea

 

Pappus setae free, usually persistent and never falling as unit; hermaphrodite florets perfect with developing achenes

Pseudoconyza

8. (4)

Pappus setae plumose

Facelis

 

Pappus setae barbellate

9

9. (8)

Achenes fusiform, distinctly rostrate; leaves opposite

Chevreulia

 

Achenes ovoid to oblong-cylindrical, erostrate; leaves alternate or rosulate

10

10. (9)

Pappus setae free to base, individually deciduous

11

 

Pappus setae united at base, sometimes deciduous as a unit

13

11. (10)

Involucres cylindrical or narrowly oblong or narrowly campanulate; florets 5-23 per capitulum; female florets 1-8 per capitulum

Achyrocline

 

Involucre campanulate; florets 25-150 per capitulum; female florets >25 per capitulum

12

12. (11)

Stereome undivided; corollas purple

Gnaphalium

 

Stereome divided; corollas white to yellow or cream

Pseudognaphalium

13. (10)

Stems 1-2 cm long; leaves oblong-lanceolate, 3.5-5 mm long, 0.5-1.5 mm wide; female florets usually 4 per capitulum

Jalcophila

 

Stems more than 2 cm long; leaves linear-lanceolate to ovate, generally more than 5 mm long and more than 2 mm wide; female florets 10 or more per capitulum

14

14. (11)

Hermaphrodite florets 4-merous; anthers with dimorphic apical anther appendages, 1 lanceolate and 3 obtuse

Stuckertiella

 

Hermaphrodite florets 5-merous (rarely 4-merous); anthers with monomorphic appendages

15

15. (14)

Achenes setuliferous, setulae very long

Lucilia

 

Achenes glabrous or setuliferous, setulae short-clavate or globose

16

16. (15)

Style arms of hermaphrodite florets truncate, not papillose externally, but with an apical ring of collector hairs

Gamochaeta

 

Style arms of hermaphrodite florets acute or rounded, papillose externally, without an apical ring of collector hairs

17

17. (16)

Leaves concave or conduplicate; stems generally prostrate but sometimes erect or ascending

Belloa

 

Leaves flat; stems erect or ascending

Luciliocline