Rancheria Clover: Trifolium albopurpureum var. albopurpureum (Synonyms: Trifolium albopurpureum var. albopurpureum , Trifolium macraei var. albopurpureum) -
Narrowleaf Crimson Clover: Trifolium angustifolium -
Hare's Foot, Rabbitfoot Clover, Rabbit-foot Clover: Trifolium arvense -
Golden Clover, Greater Hop Clover, Yellow Clover: Trifolium aureum (Synonym: Trifolium agrarium) -
Notchleaf Clover, Pinole Clover: Trifolium bifidum var. decipiens -
Hop Clover, Field Clover: Trifolium campestre (Synonym: Trifolium procumbens) -
Nodding Clover: Trifolium cernuum
Foothill Clover, Tree Clover: Trifolium ciliolatum -
Bowl Clover, Cup Clover, Wide-collared Clover: Trifolium cyathiferum -
Cowbag Clover, Poverty Clover: Trifolium depauperatum var. depauperatum (Synonyms: Trifolium depauperatum, Trifolium depauperatum var. laciniatum) -
Branched Indian Clover: Trifolium dichotomum (Synonyms: Trifolium albopurpureum var. dichotomum, Trifolium albopurpureum var. turbinatum, Trifolium macraei var. dichotomum, Trifolium petrophilum) -
Least Hop Clover, Suckling Clover: Trifolium dubium -
Cascade Clover, Cascade Woolly-head Clover: Trifolium eriocephalum ssp. cascadense -
Cusick's Clover: Trifolium eriocephalum ssp. cusickii (Synonyms: Trifolium eriocephalum var. cusickii, Trifolium eriocephalum var. harneyense) -
Woolly-head Clover, Woolly Head Clover: Trifolium eriocephalum ssp. eriocephalum (Synonyms: Trifolium eriocephalum var. butleri, Trifolium eriocephalum var. eriocephalum) -
Strawberry Cover: Trifolium fragiferum (Synonym: Trifolium fragiferum ssp. bonannii) -
Clustered Clover: Trifolium glomeratum -
Rose Clover: Trifolium hirtum -
Canyon Clover, Howell's Clover: Trifolium howellii -
Alsike Clover: Trifolium hybridum (Synonyms: Trifolium elegans, Trifolium hybridum ssp. elegans, Trifolium hybridum var. elegans, Trifolium hybridum var. pratense) -
Elongated Clover, King's Clover, Shasta Clover: Trifolium productum (Synonyms: Trifolium kingii, Trifolium kingii var. productum) -
Elmer's Clover: Trifolium longipes var. elmeri (Synonym: Trifolium longipes ssp. elmeri) -
Hansen's Clover, Long-stalked Clover: Trifolium longipes var. hansenii (Synonyms: Trifolium hansenii, Trifolium longipes ssp. hansenii, Trifolium longipes var. nevadense) -
Longstalk Clover, Long-stalked Clover: Trifolium longipes var. longipes (Synonym: Trifolium longipes ssp. longipes) -
Longstalk Clover: Trifolium longipes var. multiovulatum (Synonyms: Trifolium caurinum, Trifolium covillei, Trifolium longipes ssp. caurinum, Trifolium longipes ssp. shastense, Trifolium longipes var. shastense, Trifolium oreganum var. multiovulatum, Trifolium rusbyi ssp. caurinum) -
Bighead Clover, Big-head Clover, Large-head Clover: Trifolium macrocephalum (Synonyms: Lupinaster macrocephalus, Trifolium macrocephalum var. caeruleomontanum) -
Small-headed Clover, Small-head Clover, Woolly Clover: Trifolium microcephalum -
Thimble Clover: Trifolium microdon -
Fewflower Clover, Few-flowered Clover: Trifolium oliganthum (Synonyms: Trifolium pauciflorum, Trifolium variegatum var. pauciflorum) -
Red Clover: Trifolium pratense (Synonyms: Trifolium pratense var. frigidum, Trifolium pratense var. sativum) - Wildflower to two feet high. Individual flowers like small pink or purple claws. Flowers in tight, thumb-sized, round clumps. Leaves in threes.
Dutch Clover, White Clover: Trifolium repens -
Siskiyou Clover: Trifolium siskiyouense -
Knotted Clover: Trifolium striatum -
Burrowing Clover, Subclover, Subterraneum Clover, Subterraneum Trefoil: Trifolium subterraneum -
White-tip Clover: Trifolium variegatum (Synonyms: Trifolium appendiculatum, Trifolium geminiflorum, Trifolium melananthum, Trifolium polyodon, Trifolium trilobatum) -
Sand Clover, Springbank Clover, Tomcat Clover: Trifolium wildenovii (Synonyms: Trifolium tridentatum, Trifolium tridentatum var. tridentatum) -
Cows Clover, Salt Marsh Clover, Springbank Clover: Trifolium wormskioldii (Synonyms: Lupinaster wormskioldii, Trifolium fendleri, Trifolium fimbriatum, Trifolium heterodon, Trifolium involucratum var. fendleri, Trifolium involucratum var. heterodon, Trifolium involucratum var. kennedianum, Trifolium spinulosum, Trifolium willdenowii var. fimbriatum, Trifolium willdenowii var. kennedianum, Trifoium wormskioldii var. fimbriatum, Trifolium wormskioldii var. kennedianum, Trifolium wormskioldii var. wormskioldii, Trifolium wormskjoldii, Trifolium wormskjoldii var. wormskjoldii) -