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| Kingdom | Plantae
– plantes, Planta, Vegetal, plants |
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| Subkingdom | Viridiplantae
– green plants |
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| Infrakingdom | Streptophyta
– land plants |
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| Superdivision | Embryophyta
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| Division | Tracheophyta
– vascular plants, tracheophytes |
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| Subdivision | Spermatophytina
– spermatophytes, seed plants, phanérogames |
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| Class | Magnoliopsida
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| Superorder | Rosanae
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| Order | Rosales
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| Family | Rosaceae
– roses |
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| Genus | Horkelia Cham. & Schltdl. |
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Direct Children: |
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| Species | Horkelia bolanderi A. Gray
– border horkelia, Bolander's horkelia | |
| Species | Horkelia californica Cham. & Schltdl.
– California horkelia | |
| Species | Horkelia clevelandii (Greene) Rydb.
– Cleveland's horkelia | |
| Species | Horkelia congesta Douglas ex Hook.
– Sierra horkelia | |
| Species | Horkelia cuneata Lindl.
– wedgeleaf horkelia | |
| Species | Horkelia daucifolia (Greene) Rydb.
– carrotleaf horkelia | |
| Species | Horkelia fusca Lindl.
– dusky horkelia, pinewoods horkelia | |
| Species | Horkelia hendersonii Howell
– Henderson's horkelia | |
| Species | Horkelia hispidula Rydb.
– White Mountain horkelia | |
| Species | Horkelia howellii (Greene) Rydb.
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| Species | Horkelia marinensis (Elmer) Crum ex D.D. Keck
– Point Reyes horkelia | |
| Species | Horkelia parryi Greene
– Parry's horkelia | |
| Species | Horkelia rydbergii Elmer
– Rydberg's horkelia | |
| Species | Horkelia sericata S. Watson
– silky horkelia | |
| Species | Horkelia tenuiloba (Torr.) A. Gray
– Santa Rosa horkelia | |
| Species | Horkelia tridentata Torr.
– threetooth horkelia | |
| Species | Horkelia truncata Rydb.
– Ramona horkelia | |
| Species | Horkelia tularensis (J.T. Howell) Munz
– Kern Plateau horkelia, Tulare horkelia | |
| Species | Horkelia wilderae Parish
– Barton Flats horkelia | |
| Species | Horkelia yadonii Ertter
– Santa Lucia horkelia | |
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