| Stable identifier | Scientific Name | Media |
| https://herbarium.bgbm.org/object/B180012873 | Pinus mugo subsp. uncinata (Raymond ex A.DC.) Domin |
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| https://herbarium.bgbm.org/object/B180012875 | Pinus mugo subsp. uncinata (Raymond ex A.DC.) Domin |
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| https://herbarium.bgbm.org/object/B180012876 | Pinus mugo subsp. uncinata (Raymond ex A.DC.) Domin |
|
| https://herbarium.bgbm.org/object/B180012877 | Pinus mugo Turra f. mugo |
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| https://herbarium.bgbm.org/object/B180012878 | Pinus mugo f. mughoides (Willk.) K.I.Chr. |
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| http://herbarium.bgbm.org/object/B180012879 | Pinus mugo var. rotundata (Link) Hoopes |
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| https://herbarium.bgbm.org/object/B180012880 | Pinus mugo f. rotundata |
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| https://herbarium.bgbm.org/object/B180012881 | Pinus mugo Turra f. mugo |
|
| https://herbarium.bgbm.org/object/B180012882 | Pinus mugo f. mughoides (Willk.) K.I.Chr. |
|
| https://herbarium.bgbm.org/object/B180012883 | Pinus mugo Turra f. mugo |
|
| Stable identifier | Scientific Name | Media |
| https://w.jacq.org/W19860004916 | Pinus mugo f. mughoides (Willk.) K. I. Chr. |
|
| https://w.jacq.org/W0100226 | Crataegus laevigata (Poir.) DC. |
|
| https://w.jacq.org/W0100107 | Crataegus monogyna Jacq. |
|
| https://w.jacq.org/W0100114 | Crataegus monogyna Jacq. |
|
| https://w.jacq.org/W0100108 | Crataegus monogyna Jacq. |
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| https://w.jacq.org/W19860004915 | Pinus mugo f. applanata (Willk.) K. I. Chr. |
|
| https://w.jacq.org/W0100113 | Crataegus monogyna Jacq. |
|
| https://w.jacq.org/W0273343 | Salix amplexicaulis Bory |
|
| https://w.jacq.org/W0273342 | Salix amplexicaulis Bory |
|
Claimed natural history specimens collected or identified by Knud Ib Christensen
| Scientific Name | Country | Institution | Date |
| Aëthionema saxatile (L.) W. T. Aiton | Switzerland | B | 1853-06-29 |
| Pinus mugo f. mughoides (Willk.) K.I.Chr. | Austria | B | 1981-07-17 |
| Pinus mugo var. rotundata (Link) Hoopes | Austria | B | 1981-07-18 |
| Pinus mugo f. rotundata | Germany | B | 1981-07-15 |
| Pinus mugo f. mughoides (Willk.) K.I.Chr. | Switzerland | B | 1980-06-27 |
| Pinus mugo subsp. rotundata (Link) Janch. & H. Neumayer | Austria | B | 1981-07-16 |
| Pinus mugo f. rotundata | Switzerland | B | 1980-06-27 |
| Pinus mugo subsp. uncinata (Raymond ex A.DC.) Domin | Switzerland | B | 1980-06-28 |
| Pinus mugo subsp. uncinata (Raymond ex A.DC.) Domin | France | B | 1980-07-09 |
| Pinus mugo subsp. uncinata (Raymond ex A.DC.) Domin | France | B | 1980-07-02 |