| 1 |
Bractlets 2. |
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(2) |
| + |
Bractlets absent. |
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(8) |
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| 2 (1) |
Stems usually branched; inflorescences loose; parasitic on cultivated plants. |
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(3) |
| + |
Stems unbranched; inflorescences usually dense; parasitic on wild plants. |
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(4) |
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| 3 (2) |
Corolla 1.8-2 cm, pale blue or pale violet; anthers glabrous or subglabrous |
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6 Orobanche brassicae |
| + |
Corolla 2-3.5 cm, blue-violet or blue; anthers villous |
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7 Orobanche aegyptiaca |
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| 4 (2) |
Inflorescences densely arachnoid-villous and glandular pubescent; anthers glabrous, rarely subglabrous |
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1 Orobanche lanuginosa |
| + |
Inflorescences glandular pubescent; anthers villous or frequently subglabrous. |
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(5) |
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| 5 (4) |
Folds of lower corolla lip glabrous; calyx lobes triangular-lanceolate or triangular; style glabrous; parasitic on Kochia prostrata 4. O. kelleri |
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4 Orobanche kelleri |
| + |
Folds of lower corolla lip pilose; calyx lobes usually lanceolate; style sparsely glandular pubescent; parasitic on species of the Asteraceae. |
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(6) |
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| 6 (5) |
Anthers densely villous along sutures |
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3 Orobanche mongolica |
| + |
Anthers sparsely villous, often subglabrous. |
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(7) |
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| 7 (6) |
Calyx lobes lanceolate, subequalling tube; lower corolla lip usually shorter than upper |
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2 Orobanche uralensis |
| + |
Calyx lobes narrowly lanceolate, 1.5-2.5 X longer than tube; lower corolla lip usually longer than upper |
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5 Orobanche coelestis |
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| 8 (1) |
Calyx cupular, 4(or 5)-lobed. |
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(9) |
| + |
Calyx divided into 2 lateral, entire or 2-cleft segments. |
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(10) |
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| 9 (8) |
Corolla pale grayish blue or blue-purple, 2.5-3.5 cm; inflorescences 8-20(-30) cm, many flowered; calyx lobes narrowly lanceolate |
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17 Orobanche sinensis |
| + |
Corolla pale yellow, 2.5-2.8 cm; inflorescences 3-6 cm, 3-6-flowered; calyx lobes triangular- lanceolate 18. O. mupinensis |
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18 Orobanche mupinensis |
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| 10 (8) |
Inflorescences whitish arachnoid-villous. |
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(11) |
| + |
Inflorescences glandular pubescent, rarely sparsely villous. |
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(12) |
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| 11 (10) |
Anthers glabrous, rarely subglabrous |
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8 Orobanche coerulescens |
| + |
Anthers densely villous along sutures |
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9 Orobanche ombrochares |
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| 12 (10) |
Corolla tubular or tubular-campanulate, slightly constricted below middle and above attachment of filaments; upper corolla lip 2-lobed or emarginate; filaments inserted 5-8(-12) mm above corolla base. |
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(13) |
| + |
Corolla campanulate or tubular-campanulate, not constricted below middle; upper corolla lip entire or emarginate; filaments inserted 1.5-6(-7) mm above corolla base. |
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(19) |
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| 13 (12) |
Anthers densely villous along sutures |
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10 Orobanche pycnostachya |
| + |
Anthers glabrous or slightly villous near base. |
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(14) |
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| 14 (13) |
Corolla strongly curved, becoming conspicuously inflated; anthers glabrous, rarely subglabrous. |
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(15) |
| + |
Corolla slightly curved, not inflated; anthers villous near base, rarely subglabrous. |
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(16) |
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| 15 (14) |
Corolla yellow or pale yellow, upper lip emarginate; bracts usually equal or longer than flowers |
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11 Orobanche solmsii |
| + |
Corolla pale blue or pale violet on upper part, rarely pale yellow, upper lip 2-lobed; bracts shorter than flowers |
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12 Orobanche cernua |
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| 16 (14) |
Corolla blue, blue-purple, or pale blue on upper part. |
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(17) |
| + |
Corolla pale yellow or yellow-white. |
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(18) |
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| 17 (16) |
Corolla 2-2.5 cm; calyx segments 2-toothed |
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13 Orobanche amoena |
| + |
Corolla 1.3-2 cm; calyx segments entire, rarely 2-toothed |
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14 Orobanche clarkei |
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| 18 (16) |
Inflorescences glandular pubescent; upper corolla lip 2-lobed |
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15 Orobanche sordida |
| + |
Inflorescences villous and glandular pubescent; upper corolla lip emarginate |
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16 Orobanche kotschyi |
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| 19 (12) |
Corolla 2-3.5(-4) cm, subcampanulate, substraight along dorsal line. |
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(20) |
| + |
Corolla 1.5-2.5 cm, tubular-campanulate, curved along dorsal line. |
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(21) |
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| 20 (19) |
Anthers glabrous or subglabrous, abruptly narrowed basally into a cusp 0.1-0.3 mm; filaments inserted 1.5-3(-4) mm above corolla base; corolla pale pink or pale yellow; parasitic on species of Galium |
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20 Orobanche caryophyllacea |
| + |
Anthers villous, gradually narrowed basally into a cusp 0.3-0.5 mm; filaments inserted 4-7 mm above corolla base; corolla pale yellow or pale blue |
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19 Orobanche megalantha |
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| 21 (19) |
Inflorescences villous and glandular pubescent along axis and bracts; corolla pale yellow or brown-yellow often tinged with purple; parasitic on species of Apiaceae |
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25 Orobanche alsatica |
| + |
Inflorescences glandular pubescent; corolla of different colors. |
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(22) |
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| 22 (21) |
Corolla white or yellow-white, sometimes reddish, margin glandular pubescent with reddish hairs; calyx segments usually entire; parasitic on species of Lamiaceae |
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21 Orobanche alba |
| + |
Corolla red, yellow-brown, or pale yellow, margin glabrous or sparsely glandular, hairs not reddish; calyx segments usually 2-lobed. |
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(23) |
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| 23 (22) |
Corolla usually red |
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24 Orobanche yunnanensis |
| + |
Corolla yellow-brown or pale yellow. |
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(24) |
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| 24 (23) |
Filaments pubescent along basal 1/4-1/3, glabrous or sparsely glandular upward; stems and leaves glandular pubescent; parasitic on species of Asteraceae |
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22 Orobanche elatior |
| + |
Filaments pubescent along basal 1/2-3/4, glandular upward; lower part of stems and lower leaves glabrous; plants parasitic on species of Thalictrum |
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23 Orobanche krylowii |
