Displaying 1 - 25 out of 747 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Plagiochila | S. S. Tillett 747-1105 | 10 Jul 1974 - 19 Jul 1974 | Venezuela | Zulia | District of Perija, Sierra de… | — | 1667807 |
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| Mandevilla papillosa J.F.Morales | S. S. Tillett 45494 | 23 Sep 1960 | Guyana | — | Upper Mazaruni River Basin: Camp… | holotype | 622010 |
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| Tococa oligantha Gleason | S. S. Tillett 751-98 | 29 Jan 1975 | Venezuela | Amazonas | Cerro Duida, Base camp, due… | — | 794332 |
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| Saxifraga odontoloma Piper | S. S. Tillett 375 | 19 Jul 1954 | United States of America | Utah | Cache Co. Along stream flowing… | — | 784098 |
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| Oedematopus pakaraimensis Maguire | S. S. Tillett 45040 | 04 Aug 1960 | Guyana | — | Upper Mazaruni River Basin, Mt.… | holotype | 39162 |
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| Psychotria tillettii Steyerm. | S. S. Tillett 43946 | 01 Jul 1960 | Guyana | — | Upper Mazaruni River basin. Partang… | holotype | 132844 |
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| Psychotria tillettii Steyerm. | S. S. Tillett 43946 | 01 Jul 1960 | Guyana | — | Upper Mazaruni River basin. Partang… | isotype | 132845 |
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| Psychotria tillettii Steyerm. | S. S. Tillett 43946 | 01 Jul 1960 | Guyana | — | Upper Mazaruni River basin. Partang… | drawing of type | 132846 |
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| Mikania mazaruniensis W.C.Holmes & McDaniel | S. S. Tillett 45747 | 22 Oct 1960 | Guyana | — | British Guiana: Upper Mazaruni River… | isotype | 230532 |
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| Lesquerella multiceps Maguire | S. S. Tillett 199 | 02 Jul 1953 | United States of America | Utah | Cache Co. West side of… | — | 77105 |
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| Arabis nuttallii (Kuntze) B.L.Rob. | S. S. Tillett 364 | 19 Jul 1954 | United States of America | Utah | Cache Co. NE side of… | — | 114411 |
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| Sipanea ayangannensis Steyerm. | S. S. Tillett 45114 | 12 Aug 1960 | Guyana | — | Upper Mazaruni River basin. Mt.… | holotype | 133308 |
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| Bejaria sprucei Meisn. | S. S. Tillett 752210 | 29 Jan 1975 - 11 Feb 1975 | Venezuela | Amazonas | Alrededores dela Estación D1, campamento… | — | 2492591 |
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| Mikania tillettii R.M.King & H.Rob. | S. S. Tillett 45894 | 18 Aug 1960 | Guyana | — | British Guiana: Upper Mazaruni River… | isotype | 230603 |
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| Lesquerella multiceps Maguire | S. S. Tillett 310 | 25 Jul 1953 | United States of America | Utah | Cache Co. NE slopes of… | — | 77109 |
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| Habenaria leprieurii Rchb.f. | S. S. Tillett 44892 | 21 Jul 1960 | Guyana | — | Upper Mazaruni River Basin. Ayanganna… | — | 73823 |
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| Habenaria ayangannensis Renz | S. S. Tillett 44892 | 21 Jul 1960 | Guyana | — | Upper Mazaruni River Basin. Ayanganna… | isotype | 73811 |
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| Byrsonima pachypoda W.R.Anderson | S. S. Tillett 45073 | 10 Aug 1960-11 Aug 1960 | Guyana | — | Mt. Ayanganna; on shoulder of… | isotype | 55582 |
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| Byrsonima pachypoda W.R.Anderson | S. S. Tillett 45073 | 10 Aug 1960-11 Aug 1960 | Guyana | — | Mt. Ayanganna; on shoulder of… | isotype | 55583 |
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| Tococa aristata Benth. | S. S. Tillett 45112 | 12 Aug 1960 | Guyana | — | Upper Mazaruni, on shoulder of… | — | 793629 |
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| Arenaria congesta Nutt. ex Torr. & A.Gray | S. S. Tillett 333 | 28 Jul 1953 | United States of America | Idaho | Franklin Co. Franklin Basin. | — | 53928 |
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| Dodecatheon pulchellum (Raf.) Merr. | S. S. Tillett 282 | 23 Jul 1953 | United States of America | Utah | Cache Co. Below saddle of… | — | 223636 |
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| Malanea ciliolata Steyerm. | S. S. Tillett 45081 | 10 Aug 1960-12 Aug 1960 | Guyana | — | Upper Mazaruni River Basin. Mt.… | holotype | 132143 |
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| Alexa cowanii Yakovlev | S. S. Tillett 45630 | 12 Oct 1960 | Guyana | — | Upper Mazaruni River Basin: Akapai. | holotype | 5023 |
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| Psychotria boyanii Steyerm. | S. S. Tillett 43954 | 01 Jul 1960 | Guyana | — | Mazaruni-Potaro. Upper Mazaruni River Basin.… | holotype | 132615 |
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