| |
| L. occidentalis |
| 2' Ligules purple, pink, or white |
| L. filaginifolia |
| 3. Heads 15 per stem; involucres ± as long as wide; disk corollas 68 mm |
| var. californica |
| 3' Heads 320+ per stem; involucres ± 2 × as long as wide; disk corollas 46 mm |
| var. filaginifolia |
| |
| 4. Corollas yellow (except sometime pink marginal flowers of L. tenuis) |
| |
| 5. Plants without glands, or only the phyllaries with sparse, nail-shaped glands |
| L. germanorum |
| 5' Plants with nail- and or tack-shaped glands |
| |
| 6. Margins of cauline leaves without glands; tips of inner phyllaries generally purple or purple-tinged |
| L. tenuis |
| 6' Margins of cauline leaves glandular; tips of inner phyllaries generally green |
| |
| 7. Phyllaries with glands on margins and back of tips; plants generally rigidly much-branched; cauline leaves much reduced upward |
| L. glandulifera |
| 8. Stems prostrate, herbage densely tomentose |
| var. tomentosa |
| 8' Stems erect, herbage glabrous or thinly tomentose |
| |
| var. glandulifera |
| var. pectinata |
| 7' Phyllaries with glands on margins only; plants generally flexible, few-branched; cauline leaves only slightly reduced upwards |
| L. lemmonii |
| var. peirsonii |
| 10' Phyllaries puberulent |
| |
| 11. Cauline leaves not clasping base of involucre |
| var. lemmonii |
| 11' Cauline leaves clasping base of involucre |
| var. ramulosissima |
| 4' Corollas white, purple, or pink |
| |
| 12. Phyllaries glabrous or puberulent |
| |
| 13. Involucres widely obconic to bell-shaped; basal leaves many, present at flowering |
| L. ramulosa |
| 13' Involucres narrowly obconic; basal leaves few, generally withering before flowering |
| |
| 14. Corollas funnel-shaped; style-branch appendages 0.50.9 mm, without abrupt point |
| L. nemaclada |
| 14' Corollas tubular; style-branch appendages < 0.3 mm, with evident abrupt point |
| L. micradenia |
| 15. Margins of cauline leaves without glands |
| var. glabrata |
| 15' Margins of cauline leaves with glands |
| var. micradenia |
| 12' Phyllaries woolly or tomentose |
| |
| 16. Tips of inner phyllaries white |
| L. nana |
| 16' Tips of inner phyllaries green, scarious, or purplish |
| |
| 17. Herbage without glands |
| |
| 18. Pappus < fruit; style appendages short-triangular, 0.20.4 mm; basal leaves generally fallen before flowering, glabrous if present |
| L. arachnoidea |
| 18' Pappus = or > than fruit; style appendages tapered, 0.60.8 mm; basal leaves present at flowering, tomentose |
| L. hololeuca |
| |
| 19. Flowers 625 per head; leaves and stems glabrous or hairy; cauline leaves with glandular dots only; branches slender, flexible, spreading |
| L. leptoclada |
| 19' Flowers 36 per head; leaves and stems persistently tomentose, at least in part; cauline leaves with sessile and stalked glands; branches stout, wand-like, ascending |
| L. virgata
|