1	"Corolla yellow (externally occasionally pink or +- purple in peripheral flowers of <i>Lessingia tenuis</i>)."	2
1	"Corolla white, pink, or lavender"	8
2	"Style-branch appendage lanceolate, 0.3--1.3 mm; corolla tube not purple-brown banded inside"	3
2	"Style-branch appendage short-triangular, 0.1--0.4 mm; corolla tube purple-brown banded inside"	5
3	"Phyllaries persistently tomentose"	"Lessingia glandulifera var. peirsonii"
3	"Phyllaries sparsely hairy or glandless hairs 0"	4
4	"Stem and leaves glabrous or slightly hairy to tomentose"	"Lessingia glandulifera var. glandulifera"
4	"Stem and leaves densely, persistently tomentose --- e PR (San Diego Co.)"	"Lessingia glandulifera var. tomentosa"
5	"Plant glandless or phyllaries rarely with sparse bead-like, sessile glands"	"Lessingia germanorum"
5	"Plant +- glandular"	6
6	"Flowers 3--25; cauline leaves generally glandless, occasionally with bead-like sessile glands; phyllary tips +- purple; corolla of peripheral flowers yellow or occasionally pink or +- purple externally"	"Lessingia tenuis"
6	"Flowers 15--30; cauline leaves with stalked and bead-like sessile glands; phyllary tips generally green (occasionally purple); corolla of peripheral flowers yellow"	7
7	"Stem +- red to dark brown; leaf margin dentate to pinnately lobed, segments with short stiff points"	"Lessingia pectinata var. pectinata"
7	"Stem green or tan; leaves entire or dentate to pinnately lobed, segments without short stiff points"	"Lessingia pectinata var. tenuipes"
8	"Phyllaries generally glabrous, rarely sparsely hairy, occasionally with stalked and/or bead-like sessile glands"	9
8	"Phyllaries sparsely hairy, tomentose, or woolly, occasionally with bead-like sessile glands"	12
9	"Basal leaves generally persistent at flower; cauline leaves with stalked glands; involucre hemispheric to bell-shaped; corolla lavender (never white)"	"Lessingia ramulosa"
9	"Basal leaves generally withering before flower; cauline leaves occasionally with stalked glands; involucre cylindric to broadly obconic; corolla white (occasionally pale lavender)"	10
10	"Cauline leaves with sunken glands and occasionally with bead-like sessile and/or stalked glands; style-branch appendage generally lanceolate, occasionally short-triangular"	"Lessingia nemaclada"
10	"Cauline leaves generally glandless, occasionally with sparse stalked glands; style-branch appendage short-triangular"	11
11	"Phyllary glands 0 or bead-like, sessile"	"Lessingia micradenia var. glabrata"
11	"Phyllaries with stalked glands"	"Lessingia micradenia var. micradenia"
12	"Stem decumbent; outer phyllary tip green; inner phyllaries stiff, white; pappus pink to red"	"Lessingia nana"
12	"Stem decumbent to erect; outer phyllary tip green or purple; inner phyllaries scarious; pappus white to tan"	13
13	"Cauline leaves glandless"	14
13	"Cauline leaves with sunken glands (rarely also with stalked or bead-like sessile glands in <i>Lessingia virgata</i>), glands occasionally obscured by hairs"	15
14	"Basal leaves withered at flower; involucre 4--8 mm; style-branch appendage short-triangular; pappus generally < fruit (except in Sonoma Co.)"	"Lessingia arachnoidea"
14	"Basal leaves generally persistent at flower; involucre (5)8--13 mm; style-branch appendage lanceolate; pappus >= fruit"	"Lessingia hololeuca"
15	"Cauline leaves glabrous or sparsely hairy to tomentose; inflorescence open, cyme- or panicle-like, heads generally at ends of branchlets; flowers 6--25; corolla lavender (never white)"	"Lessingia leptoclada"
15	"Cauline leaves generally tomentose (sparsely hairy); inflorescence spike-like, heads generally in leaf axils; flowers 3--6; corolla generally white, occasionally pale lavender"	"Lessingia virgata"