1	"Sepal obviously bearded"	"Iris germanica"
1	"Sepal not obviously bearded"	2
2	"Perianth tube > 30 mm"	3
2	"Perianth tube < 30 mm"	8
3	"Cauline leaves bract-like"	4
3	"Cauline leaves similar to basal"	5
4	"Perianth pale cream-yellow with prominent brown-violet veins, rose-violet with darker veins, or +- white with rose veins; stigmas truncate, +- rounded, or 2-lobed"	"Iris purdyi"
4	"Flowers pale yellow or cream with same color (or +- red) veins; stigmas triangular or tongue-shaped"	"Iris tenuissima subsp. purdyiformis"
5	"Stigmas tongue-shaped, tip rounded; rhizome 2--5 mm diam"	6
5	"Stigmas triangular, tip acute; rhizome 4--9 mm diam"	7
6	"Stigmas entire; perianth parts elliptic or narrowly elliptic; stem generally < 1 dm"	"Iris chrysophylla"
6	"Stigmas finely toothed; perianth parts widely oblanceolate; stem >= 1 dm"	"Iris tenuissima subsp. tenuissima"
7	"Perianth tube funnel-shaped; basal leaves >= 6 mm wide"	"Iris fernaldii"
7	"Perianth tube abruptly inflated at top (bowl-like); basal leaves <= 6 mm wide"	"Iris macrosiphon"
8	"Stigmas 2-lobed; rhizomes 9--30 mm diam; cauline leaves bract-like for at least 2/3 length"	9
8	"Stigmas triangular, tongue-shaped, or rounded; rhizomes 1--12 mm or 30--40 mm diam; cauline leaves bract-like or similar to basal"	11
9	"Lowest bracts alternate; moist, coastal prairie or open coastal forest; flowers 3--6, lilac-purple"	"Iris longipetala"
9	"Lowest bracts opposite; seasonally wet sites; flowers 1--2, pale lilac to +- white, or 2--9, brown, red-brown, or green"	10
10	"Basal leaves 25--35 mm wide; bracts not scarious; flowers 2--9, pale yellow to brown, red-brown, or green, veined green or red-brown"	"Iris foetidissima"
10	"Basal leaves 3--9 mm wide; bracts generally scarious; flowers 1--2, pale lilac to +- white, veined lilac-purple"	"Iris missouriensis"
11	"Stigmas rounded; basal leaves 20--35 mm wide; rhizomes 30--40 mm diam; wetlands"	"Iris pseudacorus"
11	"Stigmas triangular or tongue-shaped; basal leaves 2--20 mm wide; rhizomes 1--12 mm diam; dry slopes (moist meadows)"	12
12	"Cauline leaves bract-like for at least 2/3 of length"	13
12	"Cauline leaves similar to basal"	17
13	"Perianth tube <= 10 mm; cauline leaves overlapped; flowers generally 2"	"Iris bracteata"
13	"Perianth tube > 10 mm; cauline leaves generally not overlapped; flowers 1--2"	14
14	"Lowest bracts spreading; ovary triangular, clearly winged"	15
14	"Lowest bracts enclosing perianth tube; ovary rounded or triangular, not winged"	16
15	"Ovary clearly winged; perianth with deep maroon or +- brown veins"	"Iris tenax subsp. klamathensis"
15	"Ovary triangular but not winged; perianth lacking dark veins"	"Iris hartwegii subsp. pinetorum"
16	"Flowers generally golden yellow; ovary rounded; petals elliptic"	"Iris innominata"
16	"Flowers generally lavender to blue, occasionally +- white; ovary triangular; petals obovate"	"Iris thompsonii"
17	"Flowers pale cream to yellow or gold-yellow, veined gold or bright yellow or not"	18
17	"Flowers blue to lavender or purple (white or pale cream), with cream or +- white throat or not"	19
18	"Flowers 3; outer bract 9--15 cm; perianth tube 11--15 mm"	"Iris hartwegii subsp. columbiana"
18	"Flowers 2; outer bract 6--11 cm; perianth tube 5--10 mm"	"Iris hartwegii subsp. hartwegii"
19	"Basal leaves 7--10 mm wide; flowers 2; dry slopes"	"Iris hartwegii subsp. australis"
19	"Basal leaves 10--22 mm wide; flowers generally > 2; grassy sites"	20
20	"Stem generally branched, flowers 2/branch; coastal plains"	"Iris douglasiana"
20	"Stem unbranched, flowers 3; wet grassy sites in s SN"	"Iris munzii"