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 |
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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) |
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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 |
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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 |
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Internodes and stems differentiated; leaves not densely imbricate or adpressed to stems; capitula on inflorecences above leaves |
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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 |
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5. (4) |
Capitula forming dense glomerules or arranged in ± dense spikes; stems winged, wings discolorous |
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Capitula solitary or ± congested but never in spikes or spherical glomerules; stems usually wingless, if winged wings concolorous |
6 |
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6. (5) |
Trees; male florets solitary; carpopodium inconspicuous; corolla contracted with short basal tube |
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Herbs or shrubs; male florets few to several, never solitary; carpopodium conspicuous and annular; corolla lacking distinct basal tube or basal tube long |
7 |
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7. (6) |
Pappus setae fused at base, often falling as unit; hermaphrodite florets functionally male, achenes poorly developed |
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Pappus setae free, usually persistent and never falling as unit; hermaphrodite florets perfect with developing achenes |
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8. (4) |
Pappus setae plumose |
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Pappus setae barbellate |
9 |
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9. (8) |
Achenes fusiform, distinctly rostrate; leaves opposite |
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Achenes ovoid to oblong-cylindrical, erostrate; leaves alternate or rosulate |
10 |
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10. (9) |
Pappus setae free to base, individually deciduous |
11 |
Pappus setae united at base, sometimes deciduous as a unit |
13 |
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11. (10) |
Involucres cylindrical or narrowly oblong or narrowly campanulate; florets 5-23 per capitulum; female florets 1-8 per capitulum |
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Involucre campanulate; florets 25-150 per capitulum; female florets >25 per capitulum |
12 |
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12. (11) |
Stereome undivided; corollas purple |
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Stereome divided; corollas white to yellow or cream |
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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 |
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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 |
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14. (11) |
Hermaphrodite florets 4-merous; anthers with dimorphic apical anther appendages, 1 lanceolate and 3 obtuse |
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Hermaphrodite florets 5-merous (rarely 4-merous); anthers with monomorphic appendages |
15 |
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15. (14) |
Achenes setuliferous, setulae very long |
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Achenes glabrous or setuliferous, setulae short-clavate or globose |
16 |
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16. (15) |
Style arms of hermaphrodite florets truncate, not papillose externally, but with an apical ring of collector hairs |
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Style arms of hermaphrodite florets acute or rounded, papillose externally, without an apical ring of collector hairs |
17 |
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17. (16) |
Leaves concave or conduplicate; stems generally prostrate but sometimes erect or ascending |
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Leaves flat; stems erect or ascending |
