1	"Stems densely cespitose or in mats < 20 cm wide; montane; per"	2
1	"Stems elongate, not cespitose, when prostrate in mats >> 25 cm; coastal, desert, or montane; annual or per"	3
2	"Inflorescence 1--5-flowered; plant in mats; leaves cauline, blade +- round; fruit wing 0"	"Abronia alpina"
2	"Inflorescence >= 6-flowered; plant densely tufted; leaves basal, blade oblong to +- round; fruit winged"	"Abronia nana var. covillei"
3	"Perennial herb; leaf fleshy; perianth limb yellow or wine-red; coastal"	4
3	"Annual (perennial herb); leaf +- not fleshy; perianth limb white, pink, red, or magenta; coastal or inland"	5
4	"Leaf blade +- as long as wide; perianth limb yellow"	"Abronia latifolia"
4	"Leaf blade longer than wide; perianth limb wine-red"	"Abronia maritima"
5	"Fruit wings thick, hollow, inflated or +- collapsed and folded together; leaves +- glabrous (sparsely puberulent); inland, mostly desert"	"Abronia turbinata"
5	"Fruit wings thin, solid, rarely 0; leaves hairy to glandular-hairy; coastal or inland, mostly desert"	6
6	"Fruit wings 2(3); fruit broadly obcordate, with sinus at top between wings"	"Abronia pogonantha"
6	"Fruit wings generally 3--5 or 0; fruit cordate, obconic, or ovoid, with no sinus at top between wings"	7
7	"Fruit body +- smooth; immediate coast"	8
7	"Fruit body with generally raised veins (most evident near tip); +- inland"	9
8	"Perianth limb light to bright magenta, throat with a cream to light yellow spot; inflorescence sparse, flowers 10--18; fruit wings angled near tip"	"Abronia umbellata var. breviflora"
8	"Perianth limb light to dark magenta, throat with white spot; inflorescence +- dense, flowers 10--27; fruit wings broadly rounded near tip"	"Abronia umbellata var. umbellata"
9	"Perianth tube 2--3.5 cm, limb (1)1.5--1.8 cm wide; fruit wings each with 1 prolonged, acute lobe distally"	"Abronia villosa var. aurita"
9	"Perianth tube 1.3--2 cm, limb 0.6--1.2(1.5) cm wide; fruit wings each with 0 or 1 shallow, rounded lobe distally"	"Abronia villosa var. villosa"