1	Plants annual, sometimes biennial, with minute, tuberous bodies		(2)
+	Plants perennial, with stolons, rhizomes, tubers, or woody caudices		(10)
2 (1)	Inflorescences with 2-several bracts (rarely only 2); proximalmost bract leaflike, distal bracts leaflike or reduced to membranous scales		(3)
+	Inflorescence ebracteate or 1-bracteate; bract leaflike		(5)
3 (2)	Flowers 4-8 mm diam.; petals not candy-striped; basal leaf blades rhombic or ovate		25 Claytonia washingtoniana
+	Flowers 8-20 mm diam.; petals white, candy-striped, or pink; basal leaf blades linear to deltate		(4)
4 (3)	Cauline leaf blades linear; distal bracts reduced to membranous scales; seeds (1-)6		3 Claytonia arenicola
+	Cauline leaf blades broad; distal bracts leaflike; seeds (1-)3		21 Claytonia sibirica (in part)
5 (2)	Flowers 10-15 mm diam.; inflorescences ebracteate		19 Claytonia saxosa
+	Flowers 2-12 mm diam.; inflorescences 1-bracteate		(6)
6 (5)	Basal leaf blades usually trullate or rhombic to deltate, sometimes spatulate, less than 3 times longer than wide		(7)
+	Basal leaf blades usually linear, sometimes spatulate, blade much longer than wide		(8)
7 (6)	Basal rosettes flattened to suberect; leaf blades trullate, spatulate, or narrowly rhombic to ovate, apex obtuse, red pigmentation often strong even in juvenile plants		17 Claytonia rubra
+	Basal rosettes suberect to erect, seldom flattened; leaf blades broadly rhombic to deltate or reniform, apex obtuse to apiculate, red pigmentation often weak		15 Claytonia perfoliata
8 (6)	Seeds often smooth or with low tubercles, not pebbly; leaf blades not glau- cous, green or pink		14 Claytonia parviflora
+	Seeds often tuberculate and pebbly; leaf blades glaucous, gray, beige, or pink		(9)
9 (8)	Flowers 3-5 mm diam		6 Claytonia exigua
+	Flowers 6-12 mm diam		7 Claytonia gypsophiloides
10 (1)	Plants with tubers sometimes connected by rhizomes		(11)
+	Plants with rhizomes or woody caudices		(19)
11 (10)	Bracts 2 or more, distal bracts leaflike or reduced to membranous scales; cauline leaves often strongly tapered in basal 1/2		(12)
+	Bracts 1 or absent, (rarely 2 in C. caroliniana); cauline leaves seldom tapered in no more than basal 1/4		(15)
12 (11)	Bracts all leaflike; tubers napiform		12 Claytonia ogilviensis
+	Proximalmost bract leaflike, distal bracts reduced to membranous scales; tubers globose		(13)
13 (12)	Petals white with yellow blotch at base		22 Claytonia tuberosa (in part)
+	Petals white, pink, rose, magenta, cream, yellow, or yellow-orange, lacking yellow blotch at base		(14)
14 (13)	Petals pink, rose, or magenta		16 Claytonia rosea
+	Petals white, cream, yellow, or yellow-orange		10 Claytonia multiscapa
15 (11)	Bracts absent; petals pink to magenta		23 Claytonia umbellata
+	Bracts present; petals white, white with yellow blotch at base, yellow, orange, or candy-striped (sometimes pink, rose, or magenta in C. caroliniana, C. lanceolata, and C. virginica)		(16)
16 (15)	Cauline leaf blades linear, 0.2-1.2 cm wide, tapered to slender base		(17)
+	Cauline leaf blades lanceolate or spatulate to ovate, 0.4-2.5 cm wide, abruptly petiolate or sessile		(18)
17 (16)	Petals white, pinkish, or rose, candy-striped, rarely yellow or orange, or white with pink-lavender candy-stripes; e North America to Texas		24 Claytonia virginica
+	Petals white with yellow blotch at base; Alaska, Yukon		22 Claytonia tuberosa (in part)
18 (16)	Basal leaves 6-21; cauline leaves petiolate; e North America		4 Claytonia caroliniana
+	Basal leaves 1-6 or absent; cauline leaves sessile; w North American cordillera		8 Claytonia lanceolata
19 (10)	Plants with woody caudices		(20)
+	Plants rhizomatous		(22)
20 (19)	Basal leaves and bracts with apex acute; petals white or pink to bright rose with yellow blotches at base, or white		1 Claytonia acutifolia
+	Basal leaves and bracts (where present) with apex obtuse; petals usually pink to magenta, sometimes yellow or white		(21)
21 (20)	Stems 1-10 cm; bracts absent; Alaska		2 Claytonia arctica
+	Stems 10-50 cm; bracts present; not in Alaska		9 Claytonia megarhiza
22 (19)	Bracts present; seeds (1-)3		(23)
+	Bracts absent; seeds (1-)6		(24)
23 (22)	Cauline leaves equal, sessile, blade lanceolate to ovate; basal leaf blades 1-5 cm wide		21 Claytonia sibirica (in part)
+	Cauline leaves unequal, petiolate, blade linear to spatulate; basal leaf blades 0.1-1 cm wide		13 Claytonia palustris
24 (22)	Rhizomes 0.5-3 mm diam.; Alaska, Yukon, n British Columbia		(25)
+	Rhizomes 4-8 mm diam.; w United States		(26)
25 (24)	Basal leaf baldes linear to narrowly spatualte, 1-10 × 0.1-1 cm		20 Claytonia scammaniana
+	Basal leaf blades elliptic to spatulate, 1-8 × 1-2 cm		18 Claytonia sarmentosa
26 (24)	Basal leaf blades deltate to ovate or cordate; cauline leaf blades 1-5 cm; petals white		5 Claytonia cordifolia
+	Basal leaf blades spatulate to rhombic or ovate; cauline leaf blades 0.5-2 cm; petals pink to magenta		11 Claytonia nevadensis