Displaying 1 - 25 out of 161 Object(s)
| Taxon | Collector | Date | Country | State/Province | Locality | Type Status | Barcode | ||
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| Acacia constricta Benth. | J. Gregg s.n. | 11 Apr 1847 | Mexico | Coahuila | Rocky highland, west of Castañuela | probable syntype | 1433 |
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| Acacia constricta Benth. | J. Gregg s.n. | 11 Apr 1847 | Mexico | Coahuila | Rocky highland, west of Castañuela | — | 1911757 |
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| Acacia greggii A.Gray | J. Gregg s.n. | 10 Apr 1847 | Mexico | — | W of Los Patos, dry… | possible isotype | 1474 |
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| Agrostis canina L. | J. Gregg s.n. | 15 Apr 1849 | United States of America | Colorado | Valley of [illegible] | — | 1554558 |
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| Alnus oblongifolia Torr. | J. Gregg 611 | 1848-1849 | Mexico | — | — | 253883 |
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| Amoreuxia wrightii A.Gray | J. Gregg s.n. | 15 Oct 1852 | United States of America | Texas | Val Verde Co. mouth of… | — | 3938242 |
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| Amoreuxia wrightii A.Gray | J. Gregg s.n. | s.d. | United States of America | New Mexico | Rio Grande | — | 3938239 |
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| Amoreuxia wrightii A.Gray | J. Gregg s.n. | 29 May 1847 | — | — | West of Cerralbo. | — | 3938241 |
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| Anisacanthus insignis A.Gray | J. Gregg 504 | 02 Apr 1847 | Mexico | — | Valley of Río Conchos (below… | lectotype | 311945 |
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| Arbutus tessellata P.D.Sørensen | J. Gregg 629 | 1848-49 | Mexico | Hidalgo | Mineral del Monte. | — | 1874922 |
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| Asclepias asperula (Decne.) Woodson | J. Gregg s.n. | 23 Apr 1847 - 29 Apr 1847 | — | — | dry valley near Ojito | — | 3493071 |
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| Asclepias linearis Scheele | J. Gregg s.n. | May 1847 | United States of America | Texas | west of Mata-Moros | — | 03517413 |
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| Astragalus micranthus var. seatonii (M.E.Jones) Barneby | J. Gregg s.n. | s.d. | Mexico | — | — | 01268119 |
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| Astragalus mollissimus var. earlei (Greene ex Rydb.) Tidestr. | J. Gregg s.n. | April 28 | Mexico | Chihuahua | Near Chihuahua | — | 01268129 | ||
| Astragalus wootonii E.Sheld. var. wootonii | J. Gregg s.n. | s.d. | Mexico | Chihuahua | SE of Chihuahua | — | 01268518 | ||
| Astragalus wootonii E.Sheld. var. wootonii | J. Gregg s.n. | 28 Apr 1847 | Mexico | Chihuahua | SE of Chihuahua | — | 01268506 | ||
| Astrolepis integerrima (Hook.) D.M.Benham & Windham | J. Gregg 297 | 1848 - 1849 | Mexico | — | Buenavista | — | 3900331 |
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| Atriplex canescens (Pursh) Nutt. | J. Gregg s.n. | 07 May 1847 | United States of America | New Mexico | Near Andabrazo Cr. XX from… | — | 3340016 |
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| Atriplex canescens (Pursh) Nutt. | J. Gregg | 11 Apr 1847 | Mexico | — | Plains east of Parras. Abundant… | — | 3340015 |
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| Atriplex greggii S.Watson | J. Gregg 462 | 1848-1849 | Mexico | — | Cerro Bavor {?illegible] | isotype | 324281 |
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| Atriplex monilifera S.Watson | J. Gregg s.n. | 13 Apr 1847 | Mexico | Chihuahua | Bolton de Mapiri | isotype | 324291 |
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| Baileya multiradiata Harv. & A.Gray | J. Gregg s.n. | 21 Apr 1847 & 28 Apr 1847 | Mexico | — | Valley of Conchos (21 Apr… | type | 162446 |
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| Baileya pleniradiata Harv. & A.Gray | J. Gregg 37 | 11 May 1847 | Mexico | — | From valley of [Naz...], Hac.… | type | 162455 |
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| Baileya pleniradiata Harv. & A.Gray | J. Gregg 28 | 17 Apr 1847 | Mexico | — | Near Garalito | type | 162456 |
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| Berlandiera lyrata Benth. | J. Gregg s.n. | 23 Apr 1847 and 28 Apr 1847 | Mexico | Chihuahua | SE of Chihuahua | — | 1924520 |
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