Displaying 1 - 25 out of 176 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Acer spicatum Lam. | C. D. Fretz s.n. | Jun 1882 | United States of America | Pennsylvania | Bucks Co. | — | 2490303 |
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| Adlumia fungosa (Aiton) Greene ex Britton, Sterns & Poggenb. | C. D. Fretz s.n. | s.d. | United States of America | Pennsylvania | Bucks Co. | — | 3703308 |
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| Amelanchier canadensis (L.) Medik. | C. D. Fretz s.n. | May 1881 - Jun 1881 | United States of America | Pennsylvania | Bucks Co. | — | 2720400 |
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| Anagallis arvensis L. | C. D. Fretz 1808 | 1873 | United States of America | Pennsylvania | Doylestown | — | 3591687 |
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| Asclepias viridiflora Raf. | C. D. Fretz s.n. | — | United States of America | Pennsylvania | Bucks Co. | — | 3535804 |
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| Bromus kalmii A.Gray | C. D. Fretz | 26 Jul 1923 | United States of America | Pennsylvania | Bucks Co. | — | 1318560 |
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| Bromus sterilis L. | C. D. Fretz s.n. | 14 Jun 1901 | United States of America | Pennsylvania | Bucks Co. | — | 1644698 |
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| Carex complanata Torr. & Hook. | C. D. Fretz s.n. | 19 Jun 1923 | United States of America | Pennsylvania | Bucks Co. Near Angus [=within… | — | 2259983 |
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| Carex granularis Muhl. ex Willd. | C. D. Fretz s.n. | 19 Jun 1923 | United States of America | Pennsylvania | Bucks Co. Ridge Valley churches,… | — | 2278682 |
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| Carex grisea var. rigida L.H.Bailey | C. D. Fretz s.n. | 06 Jun 1884 | United States of America | Delaware | Faulkland | isosyntype | 39399 |
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| Carex longii Mack. | C. D. Fretz 3242 | Jul 1883 | United States of America | New Jersey | Cape May Co. | — | 2287961 |
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| Carex virescens Muhl. ex Willd. | C. D. Fretz s.n. | — | United States of America | Pennsylvania | Sellers hill. | — | 2309914 |
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| Carex virescens Muhl. ex Willd. | C. D. Fretz s.n. | 15 Jun 1896 | United States of America | Pennsylvania | Bucks Co. Rockhill. | — | 2309915 |
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| Corallorhiza odontorhiza var. pringlei (Greenm.) Stutz | C. D. Fretz 2816 | s.d. | United States of America | Pennsylvania | Bucks Co. Sellersville | — | 4028331 |
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| Crataegus abjecta Sarg. | C. D. Fretz 108type | May 28, July 3, Sep 19, 1903 | United States of America | Pennsylvania | Bucks Co. | — | 2731008 |
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| Crataegus alacris Sarg. | C. D. Fretz 125 | 16 May 1903 - 21 Sep 1903 | United States of America | Pennsylvania | Deep Run | — | 02731079 |
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| Crataegus apposita Sarg. | C. D. Fretz 196 | 30 Sep 1904 - 02 Oct 1904 | United States of America | Pennsylvania | Bucks Co. Deep Rum | — | 2731219 |
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| Crataegus arcana Beadle | C. D. Fretz 141 | 22 May 1901 - 22 Sep 1903 | United States of America | Pennsylvania | Lawrence Co. | — | 2731268 |
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| Crataegus arcuata Ashe | C. D. Fretz 135 | 21 May 1901 - 19 Jun 1906 | United States of America | Pennsylvania | Bucks Co. | — | 2731272 |
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| Crataegus arcuata Ashe | C. D. Fretz 146 | 06 May 1901 - 10 Sep 1901 | United States of America | Pennsylvania | Bucks Co. | — | 2731280 |
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| Crataegus arcuata Ashe | C. D. Fretz 135 | 21 May 1901 | United States of America | Pennsylvania | Bucks Co. | — | 2731281 |
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| Crataegus arcuata Ashe | C. D. Fretz 203 | 17 Sep 1907 | United States of America | Pennsylvania | Bucks Co. Pekarie | — | 2731282 |
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| Crataegus austera Sarg. | C. D. Fretz 102 | 23 May 1899 - 27 Sep 1899 | United States of America | Pennsylvania | Bucks Co. | — | 02731378 |
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| Crataegus biltmoreana Beadle | C. D. Fretz | 28 May 1901 - 23 Sep 1901 | United States of America | Pennsylvania | Bucks Co. | — | 2731520 |
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| Crataegus calpodendron (Ehrh.) Medik. | C. D. Fretz s.n. | 06 Jun 1899 - 24 Jul 1899 | United States of America | Pennsylvania | Bucks Co. | — | 2731870 |
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