Key to Trifolium (Clover)

Key to Wasatch-Bear Trifolium

1	Plants acaulescent, mainly 1.5-10 cm tall	2
1	Plants caulescent, mainly 10-60 cm tall	3
2	Plants densely pulvinate-caespitose, matted UT (Rich, Summit)	Trifolium andinum[1] Intermountain Clover
2	Plants loosely caespitose, not especially mat-forming ID (Bear Lake), UT (Cache, Rich, Summit, Utah, Wasatch)	Trifolium gymnocarpon[2] Hollyleaf Clover
3	Plants stoloniferous, prostrate and rooting at nodes, flowers white. ID (Bear Lake), UT (Cache, Davis, Salt Lake, Summit, Utah, Wasatch)	Trifolium repens White Clover
3	Plants not stoloniferous, except some T. fragiferum, but then flower not white.	4
4	Calyx soon bladdery-inflated and enclosing the corolla; plants introduced UT (Cache, Davis, Morgan, Rich, Salt Lake, Summit, Utah, Wasatch, Weber)	Trifolium fragiferum[3] Strawberry Clover
4	Calyx not as above, never enclosing the corolla	5
5	Heads sessile or nearly so, subtended by a trifoliate bract; plants cultivated, but wildly escaping and persisting ID (Bear Lake), UT (Cache, Davis, Morgan, Rich, Salt Lake, Summit, Utah, Wasatch, Weber)	T. pratense Red Clover
5	Heads with well-developed peduncles, not subtended by foliose bracts.	6
6	Heads reflexed or appearing turned to one side UT (Summit, Utah)	T. kingii[4] King’s Clover
6	Heads erect	7
7	Heads subtended by a spinose-tooted involucre	8
7	Heads lacking an involucre	9
8	Plants perennial from a caudex or from rhizomes; flowers 10-18 mm long, reddish to purple UT (Cache, Salt Lake)	T. wormskjoldii[5] Cows Clover
8	Plants annual from a taproot, though often more or less rhizomatous; flowers 5-8 (12) mm long, purplish, often white-tipped, fading brown UT (Cache, Salt Lake, Weber)	T. variegatum[6] White-tip Clover
9	Flowers mainly 7-9 mm long; heads axillary from the uppermost nodes; plants cultivated, escaping and persisting UT (Cache, Davis, Rich, Salt Lake, Summit, Utah, Wasatch, Weber)	T. hybridum Alsike Clover
9	Flowers 10-16 mm long; heads terminal, solitary; plants indigenous UT (Cache, Morgan, Salt Lake, Summit, Utah, Wasatch)	Trifolium longipes[7] Longstalk Clover

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[1] Copyright S. O'Kane; L. Riedel, SEINET Collection.

[2] Copyright University of Colorado Museum of Natural History Herbarium Vascular Plant Collection

[3] Copyright Biopix: JC Schou SEINET Collection

[4] Copyright Dianne Fristrom SEINET collection

[5] Copyright Max Licher SEINET collection

[6] Copyright Keir Morse SEINET Collection

[7] Copyright Max Richer SEINET Collection