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| 1 |
Inflorescence of compound and simple umbels, compound umbels terminal, simple umbels axillary, opposite or successively verticillate forming crowded moniliform racemes. |
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(2) |
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Inflorescence of only compound umbels in an ample loose panicle. |
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(4) |
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| 2 (1) |
Stem 1–1.5 m, stout, simply branched. |
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24 Ferula feruloides |
| + |
Stem 0.3–0.6 m, slender, duplicately branched. |
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(3) |
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| 3 (2) |
Leaves roughened, hispid and deciduous; fruits ca. equal to pedicels. |
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25 Ferula caspica |
| + |
Leaves adaxially glabrous, abaxially pubescent, not deciduous; fruits longer than pedicels. |
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26 Ferula dubjanskyi |
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| 4 (1) |
Petals persistent for a long time after flowering; polycarpic; vittae 3–4 in each furrow, 10–12 on commissure. |
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10 Ferula lehmannii |
| + |
Petals deciduous after flowering, monocarpic or polycarpic. |
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(5) |
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| 5 (4) |
Stem stout, spongy; leaves usually smooth, not papillose, deciduous. |
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(6) |
| + |
Stem slender, not spongy; leaves roughened; usually papillose, persistent until plant has withered. |
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(14) |
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| 6 (5) |
Segments of leaves larger, oblong-ovate, more than 5 cm. |
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(7) |
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Segments of leaves smaller, shapes various, less than 5 cm. |
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(8) |
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| 7 (6) |
Plants strongly onion-scented; stem elongate-conic; fruit ribs narrowly winged. |
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1 Ferula conocaula |
| + |
Plants not onion-scented; stem terete; fruit ribs broadly winged. |
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2 Ferula jaeschkeana |
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| 8 (6) |
Petals abaxially glabrous. |
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9 Ferula canescens |
| + |
Petals abaxially pubescent. |
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(9) |
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| 9 (8) |
Stem slender, suberect or flexuose, 15–50 cm high, plants not onion-scented. |
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(10) |
| + |
Stem stout, erect, above 1 m high, plants strongly onion-scented. |
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(11) |
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| 10 (9) |
Plants 15–30 cm; bracteoles densely white villous; fruits 5–8 mm, longer than pedicels; vittae 2 on commissure. |
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7 Ferula syreitschikowii |
| + |
Plants ca. 50 cm; bracteoles glabrous; fruits 8–10 mm, shorter than pedicels; vittae 2–6 on commissure. |
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8 Ferula hexiensis |
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| 11 (9) |
Segments of leaves lobed or toothed; fruit vittae 3–5 in each furrow, 10–14 on commissure. |
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(12) |
| + |
Segments of leaves lanceolate; fruit vittae 1–2(–3) in each furrow, 6 on commissure. |
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(13) |
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| 12 (11) |
Stem roughened, pubescent; mature fruits 10–12 mm, equaling or shorter than pedicels |
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3 Ferula sinkiangensis |
| + |
Stem subglabrous; mature fruits 12–16 mm, longer than pedicels |
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3 Ferula sinkiangensis |
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| 13 (11) |
Umbellules 10–20-flowered; fruit 10–12 mm, vittae 1–2 in each furrow. |
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5 Ferula teterrima |
| + |
Umbellules 10–13-flowered; fruit ca. 14 mm, vittae 2 in each furrow, rarely 3 |
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16 Ferula kirialovii |
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| 14 (5) |
Leaves thick, sub-leathery, rigid, not deciduous. |
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(15) |
| + |
Leaves thin, papery, flexible, deciduous. |
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(18) |
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| 15 (14) |
Ultimate leaf segments linear, 1–2 mm, branchlets often verticillate; bracteoles deciduous. |
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14 Ferula dissecta |
| + |
Ultimate leaf segments elliptic or ovate, never linear. |
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(16) |
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| 16 (15) |
Plants low, 30–60 cm, leaves densely puberulous, bluish green; rays 4–15, spreading, unequal;
lateral umbel absent. |
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11 Ferula bungeana |
| + |
Plants tall, 1–3 m, leaves roughened, hispid or sparingly pubescent; lateral umbel present. |
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(17) |
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| 17 (16) |
Ultimate leaf segments 5–10 mm, toothed or lobed; fruit vittae 4–8 on commissure. |
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12 Ferula ovina |
| + |
Ultimate leaf segments 20–30 mm, parted, lobules entire or serrate; fruit vittae 2 on commissure. |
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13 Ferula lapidosa |
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| 18 (14) |
Ultimate segments linear or lanceolate. |
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(19) |
| + |
Ultimate segments elliptic-ovate, never linear or lanceolate. |
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(21) |
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| 19 (18) |
Leaves ternate-3–4-pinnatisect, ultimate segments up to 30 mm. |
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20 Ferula songarica |
| + |
Leaves 2–3-pinnatisect, ultimate segments 2–10 mm. |
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(20) |
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| 20 (19) |
Plants sparsely pubescent, leaves adaxially glabrous, abaxially pubescent; fruit 5–7 mm, vittae 2 on commissure. |
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21 Ferula gracilis |
| + |
Plants glabrous; fruit (7–)10–15 mm, vittae 4–8 on commissure. |
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22 Ferula licentiana |
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| 21 (18) |
Plants glabrous. |
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(22) |
| + |
Plant pubescent or hispid. |
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(23) |
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| 22 (21) |
Leaf blade 2–3-pinnatisect, ultimate segments oblong, 0.3–1 × 0.2–0.6 cm; calyx teeth conspicuous, long-triangular. |
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17 Ferula olivacea |
| + |
Leaf blade 3-pinnate, ultimate segments long-ovate or broadly ovate; calyx teeth obsolete or rarely subulate. |
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18 Ferula kingdon-wardii |
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| 23 (21) |
Leaves adaxially glabrous, abaxially pubescent, articulate between petiole and blade. |
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(24) |
| + |
Leaves roughened, hispid, not articulate between petiole and blade. |
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(25) |
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| 24 (23) |
Stem 0.5–1 m, 1 × branched; leaf blade ternate-pinnate, pinnae pinnately parted; lateral umbels
single |
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15 Ferula moschata |
| + |
Stem 2–3 m, 2 × branched; leaf blade ternate-3-pinnatisect; lateral umbels absent. |
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16 Ferula kirialovii |
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| 25 (23) |
Leaves adaxially glabrous, abaxially sparsely hirsute, basal leaves long-petiolate; bracteoles
persistent. |
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19 Ferula akitschkensis |
| + |
Leaves hispid on both surfaces, basal leaves sessile or short-petiolate; bracteoles deciduous |
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23 Ferula karataviensis |
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