1	"Bracts present; generally annual, generally wider than tall, often rounded to cushion-like; root generally red-purple, staining"	2
1	"Bracts generally 0; annual or perennial herb, generally taller than wide (rounded or cushion-like); root generally not red-purple"	7
2	"Perennial herb from a woody, branched caudex; root not red-purple"	"Cryptantha cinerea var. abortiva"
2	"Annual; root generally red-purple, staining"	3
3	"Calyx circumscissile below middle in fruit, upper tube, lobes falling as 1 unit, lower tube scarious, persistent, cup-like in fruit"	4
3	"Calyx not circumscissile in fruit"	6
4	"Corolla limb 3.5--6 mm diam, appendages larger than small to minute, yellow"	"Cryptantha similis"
4	"Corolla limb generally 1--2 mm diam, appendages small to minute, white to pale yellow"	5
5	"Stem generally > 2 cm; calyx 3--4 mm in fruit; fruit axis +- = mature nutlets; nutlet beak 0; leaf margin rolled under"	"Cryptantha circumscissa var. circumscissa"
5	"Stem 0.5--2 cm; calyx 2.5--3 mm in fruit; fruit axis < mature nutlets; nutlet strongly beaked; leaf margin +- flat"	"Cryptantha circumscissa var. rosulata"
6	"Corolla limb 1.5--4 mm diam, appendages larger than minute, yellow"	"Cryptantha micrantha var. lepida"
6	"Corolla limb 0.5--1.2 mm diam, appendages minute, +- white"	"Cryptantha micrantha var. micrantha"
7	"Biennial to perennial herb; leaves generally basal or tufted; nutlet wide-rounded to obtuse at tip; tip of attachment scar groove well below nutlet tip"	8
7	"Generally annual; leaves generally cauline; nutlet narrow-acute to acuminate at tip; tip of attachment scar groove +- to nutlet tip"	23
8	"Corolla tube > calyx; flowers heterostylous"	9
8	"Corolla tube <= calyx; flowers homostylous"	10
9	"Corolla yellow"	"Cryptantha confertiflora"
9	"Corolla white"	"Cryptantha flavoculata"
10	"Stem 1--2(3) cm; basal leaves < 1.5 cm"	"Cryptantha roosiorum"
10	"Stem generally > 2 cm; basal leaves generally > 1.5 cm"	11
11	"Nutlet abaxially +- smooth"	12
11	"Nutlet abaxially granular, tubercled, or wrinkled"	14
12	"Nutlet 4.5--6 mm, margin winged"	"Cryptantha crymophila"
12	"Nutlet generally <= 4.5 mm, margin a +- flat narrow rim or occasionally sharp-angled"	13
13	"Caudex generally woody, generally branched; basal leaves sparse-hairy"	"Cryptantha nubigena"
13	"Caudex not woody, unbranched; basal leaves dense-tomentose --- e MP"	"Cryptantha schoolcraftii"
14	"Nutlet adaxially +- smooth, especially near attachment scar"	15
14	"Nutlet adaxially granular, tubercled, or wrinkled"	17
15	"Nutlet attachment scar edges gapped"	"Cryptantha subretusa"
15	"Nutlet attachment scar edges generally not gapped"	16
16	"Caudex often woody, generally branched; basal leaves green, sparse-soft-bristly to dense-rough-hairy"	"Cryptantha nubigena"
16	"Caudex not woody, unbranched; basal leaves +- gray, dense-tomentose --- e MP"	"Cryptantha schoolcraftii"
17	"Pedicel in fruit 0--2(3) mm"	18
17	"Pedicel in fruit (2)3--12 mm"	20
18	"Corolla limb 1--3 mm diam; 1 nutlet > 2--3"	"Cryptantha racemosa"
18	"Corolla limb 3--10 mm diam; nutlets +- same size"	19
19	"Corolla limb 7--10 mm diam; calyx in fruit 7.5--10 mm; nutlet attachment scar edges flat; e Wrn"	"Cryptantha celosioides"
19	"Corolla limb 3--7 mm diam; calyx in fruit 3.5--8 mm; nutlet attachment scar edges raised; W&I, n DMtns"	"Cryptantha hoffmannii"
20	"Corolla late-deciduous to persistent; nutlet attachment scar edges flat"	21
20	"Corolla +- early-deciduous; nutlet attachment scar edges raised"	22
21	"Corolla cream, aging brown, late-deciduous; nutlet abaxial ridge low"	"Cryptantha humilis"
21	"Corolla white, aging white, persistent; nutlet abaxial ridge 0"	"Cryptantha racemosa"
22	"Plant long-lived perennial herb; caudex woody; nutlet abaxial ridge rounded, +- indistinct near base"	"Cryptantha tumulosa"
22	"Plant biennial or short-lived perennial herb; caudex not woody; nutlet abaxial ridge sharp-angled"	"Cryptantha virginensis"
23	"Nutlets +- smooth"	24
23	"Nutlets, or at least 1, rough"	46
24	"Nutlet asymmetric, attachment scar off-center"	25
24	"Nutlet symmetric, attachment scar central"	26
25	"Nutlets 4, attachment scar strongly off-center, appearing marginal; inflorescence elongate spikes"	"Cryptantha affinis"
25	"Nutlet 1(2), attachment scar off-center; inflorescence spheric clusters"	"Cryptantha glomeriflora"
26	"Calyx hairs curved or hooked and +- straight; nutlets 1(2)"	27
26	"Calyx hairs not hooked, +- straight (wavy); nutlets 1--4"	30
27	"Nutlet attachment scar edges widening into an open gap at base; fruit axis > 1/2 nutlet"	28
27	"Nutlet attachment scar edges generally abutted to overlapped at base; fruit axis < 1/2 nutlet"	29
28	"Corolla limb 1--2 mm diam; calyx lobe midveins with many stout, hooked or curved bristles, occasionally basally encrusted with exudate; nutlet 2.3--2.8 mm"	"Cryptantha rostellata"
28	"Corolla limb 3--6 mm diam; calyx lobe midveins with appressed to ascending curved hairs, with hooked or curved bristles only at tip, not basally encrusted with exudate; nutlet 1.6--2 mm"	"Cryptantha spithamaea"
29	"Nutlet lance-ovate, swollen at base, margin rounded, tip acuminate, long-beaked; corolla limb 1--5(6) mm diam; calyx hairs generally basally encrusted with exudate"	"Cryptantha flaccida"
29	"Nutlet ovate, not swollen at base, margin sharp-angled, tip +- acute, short-beaked; corolla limb 0.5--1(1.5) mm diam; calyx hairs not basally encrusted with exudate"	"Cryptantha sparsiflora"
30	"Calyx lobe tip bristles reflexed; corolla limb 0.5--1 mm diam --- nutlets 1 or 2(4)"	"Cryptantha nemaclada"
30	"Calyx lobe tip bristles generally spreading or ascending; corolla limb 0.5--8 mm diam"	31
31	"Calyx lobes 6--10 mm in fruit; longest calyx lobe bristles 3--4 mm in fruit --- nutlets 1 or 2"	"Cryptantha ganderi"
31	"Calyx lobes 1--6 mm in fruit; longest calyx lobe bristles 0 or < 3 mm in fruit"	32
32	"Bracts present"	33
32	"Bracts generally 0"	34
33	"Stem prostrate to decumbent, +- green in fruit; nutlets (3)4, smooth"	"Cryptantha leiocarpa"
33	"Stem erect to ascending, red-brown in fruit; nutlet 1, smooth or 2, 1 smooth, 1 rough"	"Cryptantha maritima"
34	"Nutlet margin a +- flat narrow rim, especially near tip, to sharp-angled; nutlets 4(3)"	35
34	"Nutlet margin generally rounded, occasionally sharp-angled; nutlets 1--4"	36
35	"Corolla limb (4)5--7.5 mm diam; nutlets +- ovate"	"Cryptantha mohavensis"
35	"Corolla limb 0.5--1.5 mm diam; nutlets +- lanceolate"	"Cryptantha watsonii"
36	"Calyx (1)1.5--3 mm in fruit"	37
36	"Calyx (2.5)3--6.5(8) mm in fruit"	39
37	"Nutlet 1.3--1.6 mm, abaxially +- round"	"Cryptantha microstachys"
37	"Nutlet 1.5--2.1 mm, abaxially +- flat"	38
38	"Calyx obconic at base; corolla limb 1--2.5 mm diam; nutlets generally 1"	"Cryptantha gracilis"
38	"Calyx rounded at base; corolla limb 3--6 mm diam; nutlets generally 2"	"Cryptantha incana"
39	"Nutlet abaxially +- flat"	40
39	"Nutlet abaxially +- round"	41
40	"Calyx 1--1.5(2) mm, (2.5)3--4.5 mm in fruit, lobe margin sparse-strigose; nutlet 1.3--1.5 mm"	"Cryptantha torreyana var. pumila"
40	"Calyx 2--2.5 mm, 4--6.5(8) mm in fruit, lobe margin dense-strigose; nutlet (1.6)1.7--2.2(2.5) mm"	"Cryptantha torreyana var. torreyana"
41	"Nutlet 1(2), adaxially +- rounded to convex, basally +- round in &times;-section"	"Cryptantha hispidula"
41	"Nutlets 1--4, adaxially +- flat, basally not round in &times;-section"	42
42	"Corolla limb 0.5--1(1.5) mm diam; nutlets generally 4; stem often stiffly branched above; W&I"	"Cryptantha fendleri"
42	"Corolla limb 1--8 mm diam; nutlets 1--4; stem 0--few-branched +- above middle or branched throughout; CA-FP"	43
43	"Stem 0--few branched +- above middle"	"Cryptantha dissita"
43	"Stem branched throughout"	44
44	"Calyx long-soft-hairy, midveins not thickened, not bristly; nutlets 1(2)"	"Cryptantha milobakeri"
44	"Calyx minute-hairy, midveins thickened, bristly; nutlets 1--4"	45
45	"Pedicel 0--0.5 mm; calyx +- appressed to stem in fruit, narrow at base, lobes linear; corolla limb 1--2.5 mm diam; nutlets 1--2"	"Cryptantha clevelandii var. clevelandii"
45	"Pedicel 0.5--1 mm; calyx not appressed to stem in fruit, +- wide at base, lobes ovate; corolla limb (1.5)2--5 mm diam; nutlets (1--2)3--4"	"Cryptantha clevelandii var. florosa"
46	"At least 1 nutlet with all or part of margin a +- flat rim (occasionally seeming sharp-angled) or wing"	47
46	"All nutlets with margin rounded or sharp-angled, not a +- flat rim or wing"	55
47	"Pedicel 1--4(6) mm in fruit"	"Cryptantha holoptera"
47	"Pedicel generally 0--1(1.5) mm in fruit"	48
48	"Nutlets 1 (2), margin a +- flat inward-bent narrow rim to basally sharp-angled, white-grainy papillate to minute-spiny; calyx narrow-urn-shaped in fruit"	"Cryptantha utahensis"
48	"Nutlets generally 4(3), margin occasionally seeming sharp-angled, generally narrow- to wide-winged along entirety, not white-grainy papillate to minute-spiny; calyx wide-urn-shaped or ovoid in fruit"	49
49	"At least some nutlet margins with a strongly lobed, wide wing"	50
49	"Nutlet margin occasionally seeming sharp-angled, generally a +- flat narrow, occasionally uneven or minute-toothed rim, not strongly lobed, not a wide wing"	52
50	"Nutlets similar in 1 fruit, all winged"	"Cryptantha pterocarya var. cycloptera"
50	"Nutlets dissimilar in 1 fruit, 3 winged, 1 not"	51
51	"Nutlet wing wide, generally > 0.5 mm"	"Cryptantha pterocarya var. pterocarya"
51	"Nutlet wing narrow, generally < 0.5 mm"	"Cryptantha pterocarya var. purpusii"
52	"Nutlets similar in 1 fruit, not differing in persistence, size, or margin shape"	53
52	"Nutlets dissimilar in 1 fruit, 1 more persistent, also differing in size or margin shape"	54
53	"Corolla limb 1--2(2.5) mm diam; calyx 4--6 mm in fruit; nutlets 1.2--1.8(2) mm, not compressed, abaxially strongly convex, dome-like; bracts present"	"Cryptantha costata"
53	"Corolla limb 4--9 mm diam; calyx 2.5--4 mm in fruit; nutlets 1.8--2.5 mm, compressed, abaxially low-rounded; bracts 0"	"Cryptantha oxygona"
54	"Nutlet 1.3--1.7 mm, in 1 fruit 1 > others, margins +- same; basal leaf rosette generally 0 at flower; calyx lobe midvein dense-spreading-bristly"	"Cryptantha inaequata"
54	"Nutlet 2--2.5 mm, in 1 fruit 1 not > others but with margin +- sharp-angled, (2)3 with margin a +- flat narrow rim or wing; basal leaf rosette generally well developed at flower; calyx lobe midvein with 0--few bristles"	"Cryptantha pterocarya var. purpusii"
55	"Nutlets 2--4, dissimilar in 1 fruit, 1 more persistent, > other(s), of similar textures or not"	56
55	"Nutlets 1--4, generally of similar persistence, size, texture"	59
56	"Nutlets similar in texture"	57
56	"Nutlets dissimilar in texture, largest +- smooth, with smaller papillae to tubercles"	58
57	"Plant generally erect, not sprawling; inflorescence dense, flowers +- 2-rowed, axis not +- flat; corolla limb 1--4 mm diam; nutlets 0.9--1.7 mm"	"Cryptantha angustifolia"
57	"Plant generally decumbent, sprawling; inflorescence not dense, flowers not 2-rowed, axis +- flat; corolla limb 0.5--1 mm diam; nutlets 1.5--2.5 mm"	"Cryptantha dumetorum"
58	"Nutlets 2, 1.5--2 mm, lanceolate; bracts present; calyx 2--3 mm in fruit, oblong, lobe midvein hairs straight"	"Cryptantha maritima"
58	"Nutlets 4, 0.7--1 mm, triangular-ovate; bracts 0; calyx 1--1.5 mm in fruit, +- spheric, lobe midvein hairs occasionally hooked"	"Cryptantha micromeres"
59	"Nutlets generally lanceolate to lance-ovate"	60
59	"Nutlets lance-ovate, ovate, or triangular-ovate"	68
60	"Nutlets generally 3--4"	61
60	"Nutlets 1(2--3)"	63
61	"Nutlets fine-papillate; spikes in 1s or 2s; ne SNE, W&I, ne DMoj"	"Cryptantha scoparia"
61	"Nutlets coarsely tubercled to papillate; spikes in 2s or 3s; widespread, except ne SNE, including W&I, ne DMoj"	62
62	"Plant +- sprawling; nutlets lanceolate; spikes not elongated in fruit; calyx lobes recurved at tips; corolla limb 1--2 mm diam"	"Cryptantha nevadensis var. nevadensis"
62	"Plant +- erect; nutlets lance-ovate; spikes elongated in fruit; calyx lobes erect to +- recurved at tips; corolla limb 2--5 mm diam"	"Cryptantha nevadensis var. rigida"
63	"Calyx in fruit strongly recurved from stem; nutlet incurved"	"Cryptantha recurvata"
63	"Calyx in fruit not recurved from stem; nutlet(s) straight"	64
64	"Nutlet attachment scar edges a large, wide, deep-concave gap; calyx +- not constricted above nutlet(s)"	"Cryptantha excavata"
64	"Nutlet attachment scar edges a small, narrow, shallow groove; calyx +- tightly constricted above nutlet(s)"	65
65	"Corolla limb 1--2.5 mm diam"	66
65	"Corolla limb 3--6 mm diam"	67
66	"Corolla limb 1--1.5 mm diam, appendages 0; calyx lobe tips recurved to spreading"	"Cryptantha decipiens"
66	"Corolla limb 1.5--2.5 mm diam, appendages minute, pale yellow; calyx lobe tips spreading to erect"	"Cryptantha ganderi"
67	"Calyx 1.5--2 mm, 3--3.5 mm in fruit, not appressed to stem in fruit, lobes oblong, not spreading-fine-bristly; nutlets 2.2--2.5 mm"	"Cryptantha corollata"
67	"Calyx 1--1.5 mm, 2.5--3(3.5) mm in fruit, appressed to stem in fruit, lobes linear, outer 3 spreading-fine-bristly; nutlets 1.5--2 mm"	"Cryptantha rattanii"
68	"Nutlet abaxial ridge +- present"	69
68	"Nutlet abaxial ridge generally 0"	72
69	"Corolla limb 3--8 mm diam"	70
69	"Corolla limb 1--3.5 mm diam"	71
70	"Calyx 1--1.5, 2--2.5 mm in fruit, +- round; nutlet +- papillate"	"Cryptantha incana"
70	"Calyx 1.5--2, 3--4 mm in fruit, ovate; nutlet dense-sharp-papillate to tubercled"	"Cryptantha muricata var. muricata"
71	"Stem few-branched, without an evident central axis; nutlets 1.8--2.2 mm, +- tubercled"	"Cryptantha muricata var. denticulata"
71	"Stem many-branched, with an evident central axis; nutlets 1.1--1.3(1.9) mm, sharp-papillate"	"Cryptantha muricata var. jonesii"
72	"Corolla limb (2)3--9 mm diam"	73
72	"Corolla limb 0.5--2.5(3) mm diam"	77
73	"Pedicel 2--3 mm in fruit; calyx silky-hairy"	"Cryptantha crinita"
73	"Pedicel 0--1.5(2) mm in fruit; calyx rough-hairy to bristly"	74
74	"Nutlets ovate, tip abruptly beaked; spikes generally in 1s to occasionally 3s, bracts generally sparse; leaves 1--2 cm, generally lowest 1--3 pairs opposite"	"Cryptantha mariposae"
74	"Nutlets lance-ovate to ovate, tip gradually tapered or acute; spikes generally in 2--4(5)s, bracts generally 0; leaves 1--5(8) cm, alternate"	75
75	"Calyx lobes narrow-oblong, midvein without coarse, spreading bristles; nutlets generally 1--2, +- ovate, sparse-low-tubercled (smooth)"	"Cryptantha intermedia var. hendersonii"
75	"Calyx lobes lance-linear to lanceolate, midvein with few to many coarse, spreading bristles; nutlets generally 3--4, lance-ovate, dense-tubercled to warty"	76
76	"Calyx 4.5--9 mm in fruit; leaves oblong to lanceolate; inflorescence generally in 2s; nutlet 1.9--2.5 mm"	"Cryptantha barbigera var. fergusoniae"
76	"Calyx 4--5.5 mm in fruit; leaves generally linear to lanceolate; inflorescence generally in 3s; nutlet 1.4--2.1(2.2) mm"	"Cryptantha intermedia var. intermedia"
77	"Bracts present; nutlets 1.2--1.4(1.5) mm"	78
77	"Bracts generally 0; nutlets 1.4--2.8 mm"	79
78	"Calyx 4--6 mm in fruit, lanceolate; flower persistent; lowest stem leaves opposite; corolla limb generally < 1 mm diam; n&c SnJV"	"Cryptantha hooveri"
78	"Calyx 3--4 mm in fruit, oblanceolate; flower not persistent; lowest stem leaves alternate; corolla limb 1.5--2 mm diam; s ChI"	"Cryptantha traskiae"
79	"Nutlet attachment scar edges triangular-flare-gapped at base"	80
79	"Nutlet attachment scar edges wide-forked, but generally abutted, not gapped, at base"	81
80	"Nutlets 1.5--2 mm, tubercle tips not translucent; nutlets 1--4, lance-ovate to ovate"	"Cryptantha barbigera var. barbigera"
80	"Nutlets +- 3 mm, tubercle tips translucent; nutlets 3--4, triangular-ovate"	"Cryptantha clokeyi"
81	"Nutlet tubercles very numerous, narrow, +- longer than broad; pedicel < 0.5 mm in fruit"	"Cryptantha echinella"
81	"Nutlet tubercles fewer, wider than broad, rounded; pedicel 0.5--1 mm in fruit"	82
82	"Spikes generally in 1s; stem branches 1--many; plant generally +- without main stem"	"Cryptantha ambigua"
82	"Spikes generally in 2s or 3s; stem branches few; plant with main stem"	"Cryptantha simulans"